Tidal power, sometimes called tidal energy, is a form of hydropower that exploits the rise and fall in sea levels due to the tides, or the movement of water caused by the tidal flow. Because the tidal forces are caused by interaction between the gravity of the Earth, Moon and Sun, tidal power is essentially inexhaustible and classified as a renewable energy source.
Tidal power can be classified into two types. Tidal stream systems make use of the kinetic energy from the moving water currents to power turbines, in a similar way to underwater wind turbines. This method is gaining in popularity because of the lower ecological impact compared to the second type of system, the barrage. Barrages make use of the potential energy from the difference in height (or head) between high and low tides, and their use is better established.
This report discusses the potential contribution that energy derived from the tides and waves can make to overall energy supply in a sustainable way. It covers the topics of wide range like how tides and waves are formed; functions of the possible and popular power generation systems especially tidal barrages,turbines, oscillating water columns and wave farms. Advantages and disadvantages of tidal and wave energy are also briefly discussed. Some cost data’s used give us brief insight into the economic prospects of the tidal and wave energy. By turning to potential along the Indian coastline, we found that India do have a huge potential of tidal and wave energy, though it has started very late. Government
initiatives and extensive research focused on the mentioned relevant opportunities will surely change the energy scenario.
OTEC - Introduction, Availability, Working Principle, Types of OTEC Systems, Limitations and Advantages
This is suitable for 8th-semester B.Tech students of AKTU, who have opted for Renewable Energy Resources (ROE086) as the open elective subject.
This report discusses the potential contribution that energy derived from the tides and waves can make to overall energy supply in a sustainable way. It covers the topics of wide range like how tides and waves are formed; functions of the possible and popular power generation systems especially tidal barrages,turbines, oscillating water columns and wave farms. Advantages and disadvantages of tidal and wave energy are also briefly discussed. Some cost data’s used give us brief insight into the economic prospects of the tidal and wave energy. By turning to potential along the Indian coastline, we found that India do have a huge potential of tidal and wave energy, though it has started very late. Government
initiatives and extensive research focused on the mentioned relevant opportunities will surely change the energy scenario.
OTEC - Introduction, Availability, Working Principle, Types of OTEC Systems, Limitations and Advantages
This is suitable for 8th-semester B.Tech students of AKTU, who have opted for Renewable Energy Resources (ROE086) as the open elective subject.
Sea waves have high energy densities, the highest among renewable energy sources with the natural seasonal variability of wave energy following the electricity demand in temperate climates securing energy supplies in remote regions.
This ppt explained the basic concept of Tidal energy , Components of Tidal barrage powerplant, Modes of generation of Tidal power, Tidal stream generator, single and double bassin arrangement, Horizontal & vertical axis Tidal turbine Helical Turbine, Dynamic Tidal powerplant, Environmental impacts and Site selection for tidal powerplant. Also describes the advantages and disadvantages of Tidal powerplant.
Solar thermal power generation systems use mirrors to collect sunlight and produce steam by solar heat to drive turbines for generating power. This system generates power by rotating turbines like thermal and nuclear power plants, and therefore, is suitable for large-scale power generation.
Hydroelectric power plant classification of hydroelectric power plant , Different types of Hydroelectric power power plant in India factor considered in selection of hydroelectric power plant
Tidal power or tidal energy is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.
Although not yet widely used, tidal energy has potential for future electricity generation. Tides are more predictable than the wind and the sun. Among sources of renewable energy, tidal energy has traditionally suffered from relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow velocities, thus constricting its total availability. However, many recent[when? clarification needed] technological developments and improvements, both in design (e.g. dynamic tidal power, tidal lagoons) and turbine technology (e.g. new axial turbines, cross flow turbines), indicate that the total availability of tidal power may be much higher than previously assumed, and that economic and environmental costs may be brought down to competitive levels.
Historically, tide mills have been used both in Europe and on the Atlantic coast of North America. The incoming water was contained in large storage ponds, and as the tide went out, it turned waterwheels that used the mechanical power it produced to mill grain. The earliest occurrences date from the Middle Ages, or even from Roman times. The process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe in the 19th century.
The world's first large-scale tidal power plant was the Rance Tidal Power Station in France, which became operational in 1966. It was the largest tidal power station in terms of output until Sihwa Lake Tidal Power Station opened in South Korea in August 2011. The Sihwa station uses sea wall defense barriers complete with 10 turbines generating 254 MW.
Sea waves have high energy densities, the highest among renewable energy sources with the natural seasonal variability of wave energy following the electricity demand in temperate climates securing energy supplies in remote regions.
This ppt explained the basic concept of Tidal energy , Components of Tidal barrage powerplant, Modes of generation of Tidal power, Tidal stream generator, single and double bassin arrangement, Horizontal & vertical axis Tidal turbine Helical Turbine, Dynamic Tidal powerplant, Environmental impacts and Site selection for tidal powerplant. Also describes the advantages and disadvantages of Tidal powerplant.
Solar thermal power generation systems use mirrors to collect sunlight and produce steam by solar heat to drive turbines for generating power. This system generates power by rotating turbines like thermal and nuclear power plants, and therefore, is suitable for large-scale power generation.
Hydroelectric power plant classification of hydroelectric power plant , Different types of Hydroelectric power power plant in India factor considered in selection of hydroelectric power plant
Tidal power or tidal energy is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity.
Although not yet widely used, tidal energy has potential for future electricity generation. Tides are more predictable than the wind and the sun. Among sources of renewable energy, tidal energy has traditionally suffered from relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow velocities, thus constricting its total availability. However, many recent[when? clarification needed] technological developments and improvements, both in design (e.g. dynamic tidal power, tidal lagoons) and turbine technology (e.g. new axial turbines, cross flow turbines), indicate that the total availability of tidal power may be much higher than previously assumed, and that economic and environmental costs may be brought down to competitive levels.
Historically, tide mills have been used both in Europe and on the Atlantic coast of North America. The incoming water was contained in large storage ponds, and as the tide went out, it turned waterwheels that used the mechanical power it produced to mill grain. The earliest occurrences date from the Middle Ages, or even from Roman times. The process of using falling water and spinning turbines to create electricity was introduced in the U.S. and Europe in the 19th century.
The world's first large-scale tidal power plant was the Rance Tidal Power Station in France, which became operational in 1966. It was the largest tidal power station in terms of output until Sihwa Lake Tidal Power Station opened in South Korea in August 2011. The Sihwa station uses sea wall defense barriers complete with 10 turbines generating 254 MW.
Tidal Energy the most common topic in science section and one of the most interesting topic . This slides contains the information how does actually tidal energy in generated and what are the advantages and disadvantages of tidal energy . Wave power design and how it works . This topic is mostly used as a project in schools and colleges in science section in higher schools
A detailed explanation of the scheme of Tidal power production is given.Two live examples along with types of schemes,scenario in the world are elucidated.
Tidal energy is the form of hydro-power that converts the energy obtained from tides into useful forms of power, mainly electricity. Although not yet widely used, tidal energy has potential for future electricity generation.
This presentation covers the basics of Tidal energy.
Tidal energy is produced by the surge of ocean waters during the rise and fall of tides. Tidal energy is a renewable source of energy.
During the 20th century, engineers developed ways to use tidal movement to generate electricity in areas where there is a significant tidal range—the difference in area between high tide and low tide. All methods use special generators to convert tidal energy into electricity.
Tidal energy production is still in its infancy. The amount of power produced so far has been small. There are very few commercial-sized tidal power plants operating in the world. The first was located in La Rance, France. The largest facility is the Sihwa Lake Tidal Power Station in South Korea. The United States has no tidal plants and only a few sites where tidal energy could be produced at a reasonable price. China, France, England, Canada, and Russia have much more potential to use this type of energy.
In the United States, there are legal concerns about underwater land ownership and environmental impact. Investors are not enthusiastic about tidal energy because there is not a strong guarantee that it will make money or benefit consumers. Engineers are working to improve the technology of tidal energy generators to increase the amount of energy they produce, to decrease their impact on the environment, and to find a way to earn a profit for energy companies.
Tidal Energy Generators
There are currently three different ways to get tidal energy: tidal streams, barrages, and tidal lagoons.
For most tidal energy generators, turbines are placed in tidal streams. A tidal stream is a fast-flowing body of water created by tides. A turbine is a machine that takes energy from a flow of fluid. That fluid can be air (wind) or liquid (water). Because water is much more dense than air, tidal energy is more powerful than wind energy. Unlike wind, tides are predictable and stable. Where tidal generators are used, they produce a steady, reliable stream of electricity.
Placing turbines in tidal streams is complex, because the machines are large and disrupt the tide they are trying to harness. The environmental impact could be severe, depending on the size of the turbine and the site of the tidal stream. Turbines are most effective in shallow water. This produces more energy and allows ships to navigate around the turbines. A tidal generator's turbine blades also turn slowly, which helps marine life avoid getting caught in the system.
The world's first tidal power station was constructed in 2007 at Strangford Lough in Northern Ireland. The turbines are placed in a narrow strait between the Strangford Lough inlet and the Irish Sea. The tide can move at 4 meters (13 feet) per second across the strait.
Barrage
Another type of tidal energy generator uses a large dam called a barrage. With a barrage, water can spill over the top or through turbines in the dam because the dam is low. Barrages can be constructed across tidal rivers, bays, and estuaries.
Daya dihasilkan oleh pembangkit yang dikoppel dengan generator.Tegangan yang dihasilkan akan disalurkan ke saluran transmisi setelah dinaikkan tegangannya mengguna trafo step up,kemudian ke saluran distribusi setelah tegangnnya diturunkan menggunakan trafo step down.Melalui trafo distribusi daya disalurkan ke pelanggan
Transmisi tenaga listrik adalah proses menghantarkan listrik dari sumber ke tempat pengguna. Mari kita jelajahi bagaimana transmisi tenaga listrik bekerja dan komponen-komponennya.
Gardu Induk SF6 atau GIS merupakan Gardu Induk yang menggunakan media isolasi elektrik berupa Gas SF6 pada semua peralatan utama di Switchgear. Hal yang harus diperhatikan dalam penggunaan gas SF6 yaitu tekanan pada gas harus sesuai dengan standarnya. GIS 150Kv. Pelabuhan Ratu merupakan salah satu Gardu Induk yang menggunakan gas SF6 sebagai media isolasi
Gardu induk adalah suatu instalasi yang terdiri dari peralatan listrik yang berfungsi untuk : 1) Mengubah tenaga listrik tegangan tingi yang satu ke tegangan tinggi yang lainnya atau tegangan menengah. 2) Pengukuran, pengawasan, operasi serta pengaturan pengamanan sistem tenaga listrik.
Stabilisasi operasi sistem tenaga listrik didefinisikan sebagai kemampuan dari sistem untuk menjaga kondisi operasi yang seimbang dan kemampuan sistem tersebut untuk kembali ke kondisi operasi normal ketika terjadi gangguan
Proteksi sistem tenaga listrik bertujuan utama untuk menjaga keamanan dan keselamatan baik bagi peralatan listrik maupun pengguna. Dengan adanya proteksi yang efektif, gangguan seperti hubung singkat dan arus lebih dapat dideteksi dan diatasi dengan cepat, sehingga mencegah terjadinya kebakaran, kerusakan peralatan, atau bahaya bagi pengguna.
Jaringan Tegangan Menengah (JTM) atau sering disebut Jaringan Distribusi Primer adalah suatu bagian daripada sistem tenaga listrik antara gardu induk dan gardu sitribusi.
Pengertian umum Gardu Distribusi tenaga listrik yang paling dikenal adalah suatu bangunan gardu listrik berisi atau terdiri dari instalasi Perlengkapan Hubung Bagi Tegangan Menengah (PHB-TM), Transformator Distribusi (TD) dan Perlengkapan Hubung Bagi Tegangan Rendah (PHB-TR) untuk memasok kebutuhan tenaga listrik bagi para pelanggan baik dengan Tegangan Menengah (TM 20 kV) maupun Tegangan Rendah (TR 220/380V).
DISTRIBUSI Jaringan Tegangan Rendah adalah bagian hilir dari sistem tenaga listrik pada tegangan distribusi di bawah 1000 Volt, yang langsung memasok kebutuhan listrik tegangan rendah ke konsumen. Di Indonesia, tegangan operasi transmisi SUTR saat ini adalah 220/ 380. Volt.
Sistem transmisi listrik berkembang seiring dengan perjalanan waktu dan inovasi teknologi. Awalnya, sistem transmisi listrik terbatas pada jarak pendek dan menggunakan tegangan rendah. Namun, penemuan generator listrik dan transformator oleh tokoh seperti Nikola Tesla membuka pintu bagi penggunaan tegangan tinggi dan pengiriman listrik jarak jauh. Perang arus listrik antara Thomas Edison dan George Westinghouse memunculkan pilihan transmisi listrik berbasis arus bolak-balik (AC) dengan tegangan tinggi, yang akhirnya menjadi standar industri karena keefisiensiannya. Seiring waktu, perkembangan teknologi terus mendukung kemajuan dalam sistem transmisi, termasuk pengenalan peralatan modern seperti circuit breakers dan sistem monitoring otomatis. Dengan pertumbuhan kebutuhan energi dan pergeseran ke sumber energi terbarukan, sistem transmisi listrik terus mengalami transformasi untuk memenuhi tantangan keberlanjutan dan efisiensi energi.
Gardu induk adalah sebuah subsistem dari system penyaluran (teransmisi) tenaga listrik. Gardu indu memiliki perang penting dari pengoprasianya, tidak dapat di pisahkan dari system penyaluran secara keseluruhan
GIS (Gas Insulated Switchgear) merupakan salah satu bagian penting dari sistem tenaga listrik yang berfungsi sebagai saluran penghubung. Gas Insulated Switchgear (GIS) adalah sebuah sistem penghubung dan pemutus jaringan listrik yang dikemas dalam sebuah tabung non ferro dan menggunakan bahan gas sulphur hexa fluorida (SF6) sebagai media isolasinya.
Sistem Tenaga Listrik merupakan sekumpulan pusat listrik dan pusat beban yang satu sama lain dihubungkan oleh jaringan transmisi dan distribusi sehingga merupakan sebuah kesatuan interkoneksi. Energi listrik dibangkitkan oleh pusat-pusat listrik seperti PLTA, PLTU, PLTG, PLTGU, PLTP dan PLTP.
Sistem proteksi tenaga listrik merupakan sistem pengaman pada peralatan peralatan yang terpasang pada sistem tenaga listrik, seperti generator, busbar, transformator, saluran udara tegangan tinggi, saluran kabel bawah tanah, dan lain sebagainya terhadap kondisi abnormal operasi sistem tenaga listrik tersebut.
Jaringan tengangan mengengah atau sering disebut jaringan distribusi primer merupakan bagian dari sistem tenaga listrik antara gardu induk dan gardu distribusi
Distribusi Tegangan Menengah adalah jaringan yang berfungsi untuk menyalurkan tenaga listrik dari gardu induk ke gardu distribusi atau kekonsumen dengan tegangan yang disalurkan adalah 20 kv.
Gardu distribusi adalah suatu fasilitas dalam sistem kelistrikan yang berfungsi untuk mendistribusikan daya listrik dari gardu induk atau stasiun transformator ke pelanggan akhir seperti rumah, industri, dan bisnis. Gardu distribusi bertindak sebagai hub yang mengatur dan menyebarkan daya listrik pada tingkat tegangan yang lebih rendah, sesuai dengan kebutuhan pengguna di area tertentu.
Jaringan Tegangan Rendah ialah jaringan tenaga listrik dengan tegangan rendah yang mencakup seluruh bagian jaringan tersebut beserta perlengkapannya dari sumber penyaluran tegangan rendah tidak termasuk SLTR. Sedangkan sambungun tenaga listrik tegangan rendah (SLTR) ialah penghantar di bawah atau di atas tanah termasuk peralatannnya mulaidari titik penyambungan pada JTR sampaidengan alat pembatas dan pengukur (APP)
Gardu Induk merupakan sub (transmisi) tenaga listrik, atau merupakan penyaluran (transmisi). Sebagai sub sistem dari sistem penyaluran (transmisi), gardu induk mempunyai peranan penting dalam pengoperasiannya tidak dapat dipisahkan dari sistem penyaluran (transmisi) secara keseluruhan
Transmisi tenaga listrik merupakan proses penyaluran tenaga listrik dari tempat pembangkit tenaga listrik (Power Plant) hingga substation distribution sehingga dapat disalurkan sampai pada konsumen pengguna listrik melalui suatu bahan konduktor
Gas Insulated Substation (GIS) didefinisikan sebagai rangkaian beberapa peralatan yang terpasang di dalam sebuah metal enclosure dan diisolasi oleh gas bertekanan(8 ).Pada umumnya gas bertekanan yang digunakan adalah Sulfur Hexafluoride (SF6). Enclosure adalah selubung pelindung yang berfungsi untuk menjaga bagian bertegangan terhadap lingkungan luar.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
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CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Cosmetic shop management system project report.pdf
TIDAL and WAVE POWER
1. TIDAL & WAVE
POWER
University of CanberraUniversity of Canberra
July 2007July 2007
byby
AshuriAshuri
GunoroGunoro
Presented in Professional ManagementPresented in Professional Management
ProgramProgram
2. 1. Tidal Power1. Tidal Power
Tidal powerTidal power, sometimes called, sometimes called tidal energytidal energy, is a form of, is a form of hydropowerhydropower thatthat
exploits the rise and fall in sea levels due to theexploits the rise and fall in sea levels due to the tidestides, or the movement of, or the movement of
water caused by the tidal flow. Because thewater caused by the tidal flow. Because the tidal forcestidal forces are caused byare caused by
interaction between theinteraction between the gravitygravity of theof the EarthEarth,, MoonMoon andand SunSun, tidal power is, tidal power is
essentially inexhaustible and classified as aessentially inexhaustible and classified as a renewable energyrenewable energy source.source.
Although not yet widely used, tidal power has great potential for futureAlthough not yet widely used, tidal power has great potential for future
electricity generationelectricity generation and is more predictable thanand is more predictable than wind energywind energy andand
solar powersolar power. In Europe,. In Europe, tide millstide mills have been used for nearly a thousandhave been used for nearly a thousand
years, mainly for grinding grains.years, mainly for grinding grains.
Tidal power can be classified into two types. Tidal stream systems makeTidal power can be classified into two types. Tidal stream systems make
use of theuse of the kinetic energykinetic energy from the moving water currents to power turbines,from the moving water currents to power turbines,
in a similar way to underwaterin a similar way to underwater wind turbineswind turbines. This method is gaining in. This method is gaining in
popularity because of the lower ecological impact compared to the secondpopularity because of the lower ecological impact compared to the second
type of system, the barrage. Barrages make use of thetype of system, the barrage. Barrages make use of the potential energypotential energy
from the difference in height (orfrom the difference in height (or headhead) between high and low tides, and) between high and low tides, and
their use is better established.their use is better established.
3. Modern advance in turbine technology may eventually see large amountsModern advance in turbine technology may eventually see large amounts
of power generated from the oceans using the tidal stream designs.of power generated from the oceans using the tidal stream designs.
Arrayed in high velocity areas where natural flows are concentrated suchArrayed in high velocity areas where natural flows are concentrated such
as the west coast of Canada, the Strait of Gibraltar, the Bosporus, andas the west coast of Canada, the Strait of Gibraltar, the Bosporus, and
numerous sites in south east Asia and Australia. Such flows occur almostnumerous sites in south east Asia and Australia. Such flows occur almost
anywhere where there are entrances to bays and rivers, or between landanywhere where there are entrances to bays and rivers, or between land
masses where water currents are concentrated.masses where water currents are concentrated.
A factor in human settlement geography is water. Human settlements haveA factor in human settlement geography is water. Human settlements have
often started around bays rivers and lakes. Future settlement may beoften started around bays rivers and lakes. Future settlement may be
concentrated around moving water, allowing communities to powerconcentrated around moving water, allowing communities to power
themselves with non-polluting energy from moving water.themselves with non-polluting energy from moving water.
4. A relatively new technology tidal stream generators draw energy from
currents in much the same way as wind turbines. The higher density of
water, some 832 times the density of air, means that a single generator
can provide significant power.
Even more so than with wind power, selection of location is critical for a
tidal stream power generator. Tidal stream systems need to be located in
areas with fast currents where natural flows are concentrated between
obstructions, for example at the entrances to bays and rivers, around
rocky points, headlands, or between islands or other land masses. The
following potential sites have been suggested:
1.1 Tidal stream power1.1 Tidal stream power
• The Pentland Firth in Scotland
• The Channel Islands in the United Kingdom
• The Cook Straits in New Zealand
• The Strait of Gibraltar
• The Bosporus in Turkey
• The Bass Strait in Australia
• The Torres Strait in Australia
• The Strait of Malacca between Indonesia and Singapore
• The Bay of Fundy in Canada.
5. Several prototypes have shown promise. Trials in the Strait of Messina,
Italy, started in 2001[1] and an Australian company <http://
tidalenergy.net.au/> undertook successful commercial trials of highly
efficient shrouded turbines on the Gold Coast, Queensland in 2002 that
was followed by successful joint venture commercial trials by Canada by
Quantum Hydro Power in 2005-2006 using the Gorlov Helical Turbine on
the Canadian West Coast where water speeds have been measured up
to 16 knots. These small 2-4 meter diameter highly efficient shrouded
turbines, considered to be the next generation in design, are capable of
100 kW - 200kW in 6 - 10 knots of water speed commonly available in
many of the Western Canadian regions waterways.
PrototypesPrototypes
6. One of the Sea Generators awaiting installation in Strangford Lough
7. During 2003 a 300 kW Periodflow marine current propeller type turbine was
tested off the coast of Devon, England, and a 150 kW oscillating hydroplane
device, the Stingray, was tested off the Scottish coast. Another British
device, the Hydro Venturi, is to be tested in San Francisco Bay.[citation
needed]
Although still a prototype, the world's first grid-connected turbine, generating
300 kW, started generation November 13, 2003, in the Kvalsund, south of
Hammerfest, Norway, with plans to install a further 19 turbines.[2][3]
The world's first commercial prototype will be installed by
Marine Current Turbines Ltd in Strangford Lough in Northern Ireland in
September 2007. The turbine will generate 1.2MW and be connected to the
grid.
8. Tidal systems do not interfere with fish migration at times of spawning,
since the water remains open. As water current turbines typically turn
very slowly at around 20-30 r.p.m., fish are able to safely navigate either
past or through the turbines, drastically reducing or eliminating fish kills
compared to barrage systems.
Environmental impactEnvironmental impact
The energy available from these kinetic systems can be expressed as:The energy available from these kinetic systems can be expressed as:
P = Cp x 0.5 x ρ x A x V3P = Cp x 0.5 x ρ x A x V3
Where:Where:
Cp is the turbine coefficient of performanceCp is the turbine coefficient of performance
P = the power generated (in kW)P = the power generated (in kW)
ρ = the density of the water (seawater is 1025 kg per cubic meter)ρ = the density of the water (seawater is 1025 kg per cubic meter)
A = the sweep area of the turbine (in m2)A = the sweep area of the turbine (in m2)
V3 = the velocity of the flow cubed (i.e. V x V x V)V3 = the velocity of the flow cubed (i.e. V x V x V)
Relative to an open turbine in free stream. Shrouded turbines areRelative to an open turbine in free stream. Shrouded turbines are
capable of higher efficiencies as much as 4 times the power of the samecapable of higher efficiencies as much as 4 times the power of the same
turbine in open flow.turbine in open flow.
Energy calculationsEnergy calculations
9. The barrage method of extracting tidal energy involves building a
barrage and creating a tidal lagoon. The barrage traps a water level
inside a basin. Head (a height of water pressure) is created when the
water level outside of the basin or lagoon changes relative to the water
level inside. The head is used to drive turbines. The
largest such installation has been working on the Rance river, France,
since 1967 with an installed (peak) power of 240 MW, and an annual
production of 600 GWh (about 68 MW average power)
1.2 Barrage tidal power1.2 Barrage tidal power
• An artistic impression of a tidal barrage, including embankments, a ship
lock and caissons housing a sluice and two turbines.
10. Artist's impression of theArtist's impression of the Severn BarrageSevern Barrage and road link proposed in 1989.and road link proposed in 1989.
The scheme would have generated 6% of theThe scheme would have generated 6% of the UK'sUK's electricity supplyelectricity supply
11. The basic elements of a barrage are caissons, embankments, sluices,
turbines and ship locks. Sluices, turbines and ship locks are housed in
caisson (very large concrete blocks). Embankments seal a basin where it
is not sealed by caissons.
The sluice gates applicable to tidal power are the flap gate, vertical rising
gate, radial gate and rising sector.
Barrage systems are sometimes affected by problems of high civil
infrastructure costs associated with what is in effect a dam being placed
across two estuarine systems, and the environmental problems associated
with changing a large ecosystem.
12. The basin is filled through the sluices until high tide. Then the sluiceThe basin is filled through the sluices until high tide. Then the sluice
gates are closed. (At this stage there may be "Pumping" to raise the levelgates are closed. (At this stage there may be "Pumping" to raise the level
further). The turbine gates are kept closed until the sea level falls tofurther). The turbine gates are kept closed until the sea level falls to
create sufficient head across the barrage, and then are opened so thatcreate sufficient head across the barrage, and then are opened so that
the turbines generate until the head is again low. Then the sluices arethe turbines generate until the head is again low. Then the sluices are
opened, turbines disconnected and the basin is filled again. The cycleopened, turbines disconnected and the basin is filled again. The cycle
repeats itself. Ebb generation (also known as outflow generation) takesrepeats itself. Ebb generation (also known as outflow generation) takes
its name because generation occurs as the tide ebbs.its name because generation occurs as the tide ebbs.
Modes of operationModes of operation
Ebb generationEbb generation
The basin is filled through the turbines, which generate at tide flood. ThisThe basin is filled through the turbines, which generate at tide flood. This
is generally much less efficient than ebb generation, because the volumeis generally much less efficient than ebb generation, because the volume
contained in the upper half of the basin (which is where ebb generationcontained in the upper half of the basin (which is where ebb generation
operates) is greater than the volume of the lower half (and making theoperates) is greater than the volume of the lower half (and making the
difference in levels between the basin side and the sea side of thedifference in levels between the basin side and the sea side of the
barrage), (and therefore the available potential energy) less than it wouldbarrage), (and therefore the available potential energy) less than it would
otherwise be. This is not a problem with the "lagoon" model; the reasonotherwise be. This is not a problem with the "lagoon" model; the reason
being that there is no current from a river to slow the flooding currentbeing that there is no current from a river to slow the flooding current
from the sea.from the sea.
Flood generationFlood generation
13. Turbines are able to be powered in reverse by excess energy in the gridTurbines are able to be powered in reverse by excess energy in the grid
to increase the water level in the basin at high tide (for ebb generation).to increase the water level in the basin at high tide (for ebb generation).
This energy is more than returned during generation, because powerThis energy is more than returned during generation, because power
output is strongly related to the head.output is strongly related to the head.
PumpingPumping
With two basins, one is filled at high tide and the other is emptied at lowWith two basins, one is filled at high tide and the other is emptied at low
tide. Turbines are placed between the basins. Two-basin schemes offertide. Turbines are placed between the basins. Two-basin schemes offer
advantages over normal schemes in that generation time can beadvantages over normal schemes in that generation time can be
adjusted with high flexibility and it is also possible to generate almostadjusted with high flexibility and it is also possible to generate almost
continuously. In normal estuarine situations, however, two-basincontinuously. In normal estuarine situations, however, two-basin
schemes are very expensive to construct due to the cost of the extraschemes are very expensive to construct due to the cost of the extra
length of barrage. There are some favourable geographies, however,length of barrage. There are some favourable geographies, however,
which are well suited to this type of scheme.which are well suited to this type of scheme.
Two-basin schemesTwo-basin schemes
The placement of a barrage into an estuary has a considerable effect onThe placement of a barrage into an estuary has a considerable effect on
the water inside the basin and on the fish. A tidal current turbine will havethe water inside the basin and on the fish. A tidal current turbine will have
a much lower impact.a much lower impact.[[
Environmental impactEnvironmental impact
14. Turbidity (the amount of matter in suspension in the water) decreases asTurbidity (the amount of matter in suspension in the water) decreases as
a result of smaller volume of water being exchanged between the basina result of smaller volume of water being exchanged between the basin
and the sea. This lets light from the Sun to penetrate the water further,and the sea. This lets light from the Sun to penetrate the water further,
improving conditions for theimproving conditions for the phytoplanktonphytoplankton. The changes propagate up. The changes propagate up
thethe food chainfood chain, causing a general change in the, causing a general change in the ecosystemecosystem..
TurbidityTurbidity
As a result of less water exchange with the sea, the average salinityAs a result of less water exchange with the sea, the average salinity
inside the basin decreases, also affecting the ecosystem. "Tidalinside the basin decreases, also affecting the ecosystem. "Tidal
Lagoons" do not suffer from this problem.Lagoons" do not suffer from this problem.
SalinitySalinity
Estuaries often have high volume of sediments moving through them,Estuaries often have high volume of sediments moving through them,
from the rivers to the sea. The introduction of a barrage into an estuaryfrom the rivers to the sea. The introduction of a barrage into an estuary
may result in sediment accumulation within the barrage, affecting themay result in sediment accumulation within the barrage, affecting the
ecosystem and also the operation of the barrage.ecosystem and also the operation of the barrage.
Sediment movementsSediment movements
15. Again, as a result of reduced volume, the pollutants accumulating in theAgain, as a result of reduced volume, the pollutants accumulating in the
basin may be less efficiently dispersed, so their concentrations maybasin may be less efficiently dispersed, so their concentrations may
increase. Forincrease. For biodegradablebiodegradable pollutants, such aspollutants, such as sewagesewage, an increase in, an increase in
concentration is likely to lead to increased bacteria growth in the basin,concentration is likely to lead to increased bacteria growth in the basin,
having impacts on the health of the human community and thehaving impacts on the health of the human community and the
ecosystem.ecosystem.
PollutantsPollutants
Fish may move through sluices safely, but when these are closed, fishFish may move through sluices safely, but when these are closed, fish
will seek out turbines and attempt to swim through them. Also, some fishwill seek out turbines and attempt to swim through them. Also, some fish
will be unable to escape the water speed near a turbine and will bewill be unable to escape the water speed near a turbine and will be
sucked through. Even with the most fish-friendly turbine design, fishsucked through. Even with the most fish-friendly turbine design, fish
mortality per pass is approximately 15% (from pressure drop, contactmortality per pass is approximately 15% (from pressure drop, contact
with blades,with blades, cavitationcavitation, etc.). This can be acceptable for a, etc.). This can be acceptable for a spawning runspawning run,,
but is devastating for local fish who pass in and out of the basin on abut is devastating for local fish who pass in and out of the basin on a
daily basis. Alternative passage technologies (daily basis. Alternative passage technologies (fish laddersfish ladders, fish lifts, etc.), fish lifts, etc.)
have so far failed to solve this problem for tidal barrages, either offeringhave so far failed to solve this problem for tidal barrages, either offering
extremely expensive solutions, or ones which are used by a smallextremely expensive solutions, or ones which are used by a small
fraction of fish only. Research in sonic guidance of fish is ongoing.fraction of fish only. Research in sonic guidance of fish is ongoing.
FishFish
16. The energy available from barrage is dependant on the volume of water.The energy available from barrage is dependant on the volume of water.
TheThe potential energypotential energy contained in a volume of water is :contained in a volume of water is :
Energy calculationsEnergy calculations
A barrage is therefore best placed in a location with very high-amplitudeA barrage is therefore best placed in a location with very high-amplitude
tides. Suitable locations are found intides. Suitable locations are found in RussiaRussia,, USAUSA,, CanadaCanada,, AustraliaAustralia,,
KoreaKorea, the, the UKUK and elsewhere. Amplitudes of up to 17 m (56 ft) occur forand elsewhere. Amplitudes of up to 17 m (56 ft) occur for
example in theexample in the Bay of FundyBay of Fundy, where, where tidal resonancetidal resonance amplifies the tidalamplifies the tidal
waves.waves.
where:
x : is the height of the tide
M : is the mass of water
g : is the acceleration due to gravity at the Earth's surface.
xMgE =
17. Tidal barrage power schemes have a high capital cost and a very lowTidal barrage power schemes have a high capital cost and a very low
running cost. As a result, a tidal power scheme may not produce returnsrunning cost. As a result, a tidal power scheme may not produce returns
for years, and investors are thus reluctant to participate in such projects.for years, and investors are thus reluctant to participate in such projects.
Governments may be able to finance tidal barrage power, but many areGovernments may be able to finance tidal barrage power, but many are
unwilling to do so also due to the lag time before investment return andunwilling to do so also due to the lag time before investment return and
the high irreversible commitment. For example thethe high irreversible commitment. For example the
energy policy of the United Kingdomenergy policy of the United Kingdom[4][4] recognizes the role of tidal energyrecognizes the role of tidal energy
and expresses the need for local councils to understand the broaderand expresses the need for local councils to understand the broader
national goals of renewable energy in approving tidal projects. The UKnational goals of renewable energy in approving tidal projects. The UK
government itself appreciates the technical viability and sitting optionsgovernment itself appreciates the technical viability and sitting options
available, but has failed to provide meaningful incentives to move itsavailable, but has failed to provide meaningful incentives to move its
goals forward.goals forward.
EconomicsEconomics
Tidal power schemes do not produce energy all day. A conventionalTidal power schemes do not produce energy all day. A conventional
design, in any mode of operation, would produce power for 6 to 12 hoursdesign, in any mode of operation, would produce power for 6 to 12 hours
in every 24 and will not produce power at other times. As the tidal cycle isin every 24 and will not produce power at other times. As the tidal cycle is
based on the rotation of the Earth with respect to the moon (24.8 hours),based on the rotation of the Earth with respect to the moon (24.8 hours),
and the demand for electricity is based on the period of rotation of theand the demand for electricity is based on the period of rotation of the
earth (24 hours), the energy production cycle will not always be in phaseearth (24 hours), the energy production cycle will not always be in phase
with the demand cycle.with the demand cycle.
Variable nature of power outputVariable nature of power output
18. Mathematical modelling of tidal schemesMathematical modelling of tidal schemes
In mathematical modelling of a scheme design, the basin is broken intoIn mathematical modelling of a scheme design, the basin is broken into
segments, each maintaining its own set of variables. Time is advanced in steps.segments, each maintaining its own set of variables. Time is advanced in steps.
Every step, neighbouring segments influence each other and variables areEvery step, neighbouring segments influence each other and variables are
updated.updated.
In these models, the basin is broken into large segments (1D), squares (2D) orIn these models, the basin is broken into large segments (1D), squares (2D) or
cubes (3D). The complexity and accuracy increases with dimension.cubes (3D). The complexity and accuracy increases with dimension.
Mathematical modelling produces quantitative information for a range ofMathematical modelling produces quantitative information for a range of
parameters, including:parameters, including:
• Water levels (during operation, construction, extreme conditions, etc.)Water levels (during operation, construction, extreme conditions, etc.)
• CurrentsCurrents
• WavesWaves
• Power outputPower output
• TurbidityTurbidity
• SalinitySalinity
• Sediment movementsSediment movements
19. Tidal energy has an efficiency of 80% in converting the potential energyTidal energy has an efficiency of 80% in converting the potential energy
of the water into electricity,of the water into electricity,[[citationcitation neededneeded]] which is efficient comparedwhich is efficient compared
to other energy resources such asto other energy resources such as solar powersolar power oror fossil fuel power plantsfossil fuel power plants..
Energy efficiencyEnergy efficiency
A tidal power scheme is a long-term source of electricity. A proposal forA tidal power scheme is a long-term source of electricity. A proposal for
thethe Severn BarrageSevern Barrage, if built, has been projected to save 18 million tons of, if built, has been projected to save 18 million tons of
coalcoal per year of operation. This decreases the output ofper year of operation. This decreases the output of
greenhouse gasesgreenhouse gases into the atmosphere.into the atmosphere.
Global environmental impactGlobal environmental impact
If fossil fuel resource is likely to decline during the 21st, as predicted byIf fossil fuel resource is likely to decline during the 21st, as predicted by
HubbertHubbert peak theorypeak theory, tidal power is one of the alternative source of, tidal power is one of the alternative source of
energy that will need to be developed to satisfy the human demand forenergy that will need to be developed to satisfy the human demand for
energy.energy.
20. Operating tidal power schemesOperating tidal power schemes
Resource around the worldResource around the world
• The first tidal power station was the Rance tidal power plant built over a period of 6
years from 1960 to 1966 at La Rance, France.[5] It has 240MW installed capacity.
• The first (and only) tidal power site in North America is the
Annapolis Royal Generating Station, Annapolis Royal, Nova Scotia, which opened
in 1984 on an inlet of the Bay of Fundy.[6] It has 20MW installed capacity.
• A small project was built by the Soviet Union at Kislaya Guba on the Barents Sea. It
has 0.5MW installed capacity.
• China has apparently developed several small tidal power projects and one large
facility in Jiangxia.
• China is also developing a tidal lagoon near the mouth of the Yalu.[7]
• Scotland has committed to having 18% of its power from green sources by 2010,
including 10% from a tidal generator. The British government says this will replace
one huge fossil fueled power station.[8]
• South African energy parastatal Eskom is investigating using the
Mozambique Current to generate power off the coast of KwaZulu Natal. Because
the continental shelf is near to land it may be possible to generate electricity by
tapping into the fast flowing Mozambique current.
21. Tidal power schemes being consideredTidal power schemes being considered
In the table,
'-' indicates missing
information,
'?' indicates
information which
has not been
decided
Country Place
Mean tidal range
(m)
Area of basin
(km²)
Maximum
capacity (MW)
Argentina San Jose 5.9 - 6800
Australia Secure Bay 10.9 - ?
Canada
Cobequid 12.4 240 5338
Cumberland 10.9 90 1400
Shepody 10.0 115 1800
Passamaquoddy 5.5 - ?
India
Kutch 5.3 170 900
Cambay 6.8 1970 7000
Korea
Garolim 4.7 100 480
Cheonsu 4.5 - -
Mexico
Rio Colorado 6 -7 - ?
Tiburon - - ?
United Kingdom
Severn 7.8 450 8640
Mersey 6.5 61 700
Strangford Lough - - -
Conwy 5.2 5.5 33
United States
Passamaquoddy 5.5 - ?
Knik Arm 7.5 - 2900
Turnagain Arm 7.5 - 6501
Russia
Mezen 9.1 2300 19200
Tugur - - 8000
Penzhinskaya Bay 6.0 - 87000
South Africa Mozambique Channel ? ? ?
22. Introduction
The tide moves a huge amount of
water twice each day, and
harnessing it could provide a great
deal of energy - around 20% of
Britain's needs.
Although the energy supply is
reliable and plentiful, converting it
into useful electrical power is not
easy.
There are eight main sites around
Britain where tidal power stations
could usefully be built, including the
Severn, Dee, Solway and Humber
estuaries.
Only around 20 sites in the world
have been identified as possible tidal
power stations.
23. How it works: Tidal Barrages
These work rather like a hydro-electric
scheme, except that the dam is much
bigger.
A huge dam (called a "barrage") is built
across a river estuary. When the tide goes
in and out, the water flows through tunnels
in the dam.
The ebb and flow of the tides can be used to
turn a turbine, or it can be used to push air
through a pipe, which then turns a turbine.
Large lock gates, like the ones used on
canals, allow ships to pass.
24. More details
The largest tidal power station in the world
(and the only one in Europe) is in the
Rance estuary in northern France. It was
built in 1966.
A major drawback of tidal power stations is
that they can only generate when the tide is
flowing in or out - in other words, only for
10 hours each day. However, tides are
totally predictable, so we can plan to have
other power stations generating at those
times when the tidal station is out of action.
There have been plans for a "Severn Barrage" from Brean Down in Somerset to Lavernock
Point in Wales. Every now and again the idea gets proposed, but nothing has been built yet.
It may have over 200 large turbines, and provide over 8,000 Megawatts of power (that's over
12 nuclear power station's worth). It would take 7 years to build, and could provide 7% of the
energy needs for England and Wales.
There would be a number of benefits, including protecting a large stretch of coastline against
damage from high storm tides, and providing a ready-made road bridge. However, the drastic
changes to the currents in the estuary could have huge effects on the ecosystem.
25. offshore turbines
Another option is to use
offshore turbines rather
like an underwater wind
farm.
This has the advantage of
being much cheaper to
build, and does not have
the environmental
problems that a tidal
barrage would bring.
There are also many more
suitable sites.
Find out more about the
world's first offshore tidal
power station at
26. The University of Wales
Swansea and partners are also
researching techniques to
extract electrical energy from
flowing water.
The "Swanturbines" design is
different to other devices in a
number of ways. The most
significant is that it is direct drive,
where the blades are connected
directly to the electrical generator
without a gearbox between. This
is more efficient and there is no
gearbox to go wrong. Another
difference is that it uses a
"gravity base", a large concrete
block to hold it to the seabed,
rather than drilling into the
seabed. Finally, the blades are
fixed pitch, rather than actively
controlled, this is again to design
out components that could be
unreliable.
29. 2.1 Introduction2.1 Introduction
Ocean waves are caused by the wind asOcean waves are caused by the wind as
it blows across the sea. Waves are ait blows across the sea. Waves are a
powerful source of energy.powerful source of energy.
The problem is that it's not easy toThe problem is that it's not easy to
harness this energy and convert it intoharness this energy and convert it into
electricity in large amounts. Thus, waveelectricity in large amounts. Thus, wave
power stations are rare.power stations are rare.
30. Wave energy from the wind on the seaWave energy from the wind on the sea
39. Oscillating or Assisted Water Columns (OWC), buoys and pontoons (theOscillating or Assisted Water Columns (OWC), buoys and pontoons (the
Hosepump), flaps and tapered channels (the Pendulor and TAPCHAN) stillHosepump), flaps and tapered channels (the Pendulor and TAPCHAN) still
existor continue to be developedexistor continue to be developed
40. How it worksHow it works
• There are several methods of getting energy from
waves, but one of the most effective works like a
swimming pool wave machine in reverse.
• At a swimming pool, air is blown in and out of a chamber
beside the pool, which makes the water outside bob up
and down, causing waves.
• At a wave power station, the waves arriving cause the
water in the chamber to rise and fall, which means that
air is forced in and out of the hole in the top of the
chamber.
41. We place a turbine in this holeWe place a turbine in this hole
42. We place a turbine in this holeWe place a turbine in this hole
• which is turned by the air rushing in and out. The turbine
turns a generator.
• A problem with this design is that the rushing air can be
very noisy, unless a silencer is fitted to the turbine. The
noise is not a huge problem anyway, as the waves make
quite a bit of noise themselves.
43. More detailsMore details
• Once you've built it, the energy is free, needs no fuel and
produces no waste or pollution.
• One big problem is that of building and anchoring
something that can withstand the roughest conditions at
sea, yet can generate a reasonable amount of power
from small waves. It's not much use if it only works
during storms!
44. LimpetLimpet
A company called Wavegen now operate a
commercial wave power station called
"Limpet" on the Scottish island of Islay.
47. PelamisPelamis
A company called Ocean Power Delivery are developing a
method of offshore wave energy collection, using a floating
tube called "Pelamis".
54. PELAMISPELAMIS
bobs up and down in the waves, as the hinges bend theybobs up and down in the waves, as the hinges bend they
pump hydraulic fluid which drives generators.pump hydraulic fluid which drives generators.
55. The first prototype was installed at the EuropeanThe first prototype was installed at the European
Marine Energy Centre at Orkney.Marine Energy Centre at Orkney.
56. The Pelamis on site at the EMECThe Pelamis on site at the EMEC
centre, Orkneycentre, Orkney
58. DisadvantagesDisadvantages
• Depends on the waves - sometimes you'll get loads of
energy, sometimes nothing.
• Needs a suitable site, where waves are consistently
strong.
• Some designs are noisy.
• Must be able to withstand very rough weather.
59. Is it renewable?Is it renewable?
• Wave power is renewable.
• Don’t Forget to Remember it !!!!