Conduction transfers heat through direct contact between molecules. Heat flows from hotter to colder areas as faster molecules collide with and transfer energy to slower ones. The rate of conduction depends on temperature difference, object size/shape, material properties like thermal conductivity. Metals conduct heat better than fabrics due to higher conductivity.
Convection transfers heat via fluid movement. Heated fluid expands, becomes less dense and rises, while cooler fluid sinks below. This drives convection currents that circulate heat through a fluid. Natural convection occurs without external influence, like a heated pan cooling in air. Forced convection uses devices like fans to enhance fluid and heat flow.
Radiation emits electromagnetic waves to transfer heat
Insulation _refractories,Purpose of Insulation,Types and Application,Economic Thickness of Insulation (ETI). Simplified Formula for Heat Loss Calculation, Refractories, Properties of Refractories,Classification of Refractories,Selection of Refractories, Heat Losses from Furnace Walls
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Compressor Types
Compressor Performance
Compressed Air System Components
Efficient Operation of Compressed Air Systems
Compressor Capacity Assessment
Checklist for Energy Efficiency in Compressed Air System
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Lab Layout
Study of construction details and working of lathe trainer
Study of Chemical machining and process of chemical machining
Roughing and Finishing Program - Rectangular Pocket
One Step Finishing Cycle Program - Rectangular Pocket
Write a G-Code Program for the Part Shown Below
A typical round part used for CNC programming and machining.
Circular pocket cutting
Slot milling
Slot finishing
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Safety Inspections and Sample Safety Inspection.Health and safety training D...Salman Jailani
Safety Inspections and Sample Safety Inspection.Health and safety training Definition of risk WHAT ARE PERMITS-TO-WORK
Mechanical Engineering
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
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.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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.
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.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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/
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptx
Conduction type, convectonsand its types, radiations and its types .
1. Conduction:
Conduction transfers heat via direct molecular collision. An area of greater kinetic energy will
transfer thermal energy to an area with lower kinetic energy. Higher-speed particles will collide
with slower speed particles. The slower-speed particles will increase in kinetic energy as a result.
Conduction is the most common form of heat transfer and occurs via physical contact. Examples
would be to place your hand against a window or place metal into an open flame. The process of
heat conduction depends on the following factors: temperature gradient, cross-section of the
material, length of the travel path, and physical material properties. The temperature gradient is
the physical quantity that describes the direction and rate of heat travel. Temperature flow will
always occur from hottest to coldest or, as stated before, higher to lower kinetic energy. Once
there’s thermal equilibrium between the two temperature differences, the thermal transfer stops.
Cross-section and path of travel both play an important part in conduction. The greater the size
and length of an object, the more energy that’s required to heat it. And the greater the surface
area that’s exposed, the more heat is lost. Smaller objects with small cross-sections have minimal
heat loss.
Physical properties determine which materials transfer heat better than others. Specifically, the
thermal conductivity coefficient dictates that a metal material will conduct heat better than cloth
when it comes to conduction. The following equation calculates the rate of conduction:
Q = [k ∙ A ∙ (Thot – Tcold)]/d
where Q = heat transferred per unit time; k = thermal conductivity of the barrier; A = heat-
transfer area; Thot = temperature of the hot region; Tcold = temperature of the cold region; and d =
thickness of the barrier.
2. A modern of use of conduction is being developed by Dr. Gyung-Min Choi at the University of
Illinois. Dr. Choi uses spin current to generate spin transfer torque. Spin transfer torque is the
transfer of the spin angular momentum generated by the conduction electrons to the
magnetization of a ferromagnet. Instead of using magnetic fields, this allows the manipulation of
nanomagnets with spin currents. (Courtesy of Alex Jerez, Imaging Technology Group, The
Beckman Institute).
Types of Conduction:
1. Electric Conduction:
Electric conduction refers to the ability of a material to transfer an electric current. Conductivity
is determined by how dense an object is compared to the strength of the electric field it can
maintain. Metals are substances with a high level of conductivity (also known as a conductor)
since they display minimal resistance to an electrical charge. Insulators, such as glass, are
materials that are resistant to electrical charges. Televisions, radios and computers are examples
of inventions that rely on the current provided by electric conduction.
3. 2. Heat Conduction:
Where electric conduction refers to a transfer or electric current, heat conduction refers to a
transfer of energy, specifically thermal energy. Heat conduction is sometimes called thermal
conduction. The energy is transferred within a stationary object as a result of a change in
temperature in parts of a material adjacent to one another. The energy will move quickly or
slowly depending on what the object is made of, how large it is and, most importantly, the
temperature gradient. Temperature gradient refers to the rate and direction in which the
temperature changes from a specific point to another point. Diamonds and copper are materials
with high thermal conductivity.
3. Photoconductivity:
Photoconductivity occurs when a material absorbs electromagnetic radiation, resulting in a
change in the substance's electrical conductivity. The electromagnetic radiation can be caused by
something as simple as a light shining on a semiconductor or something as complex as a material
being exposed to gamma radiation. When the electromagnetic event occurs, the number of free
electrons increases, as does the number of electron holes, thus increasing the object's electrical
conductivity. Common applications of photoconductivity include copy machines, solar panels
and infrared detection equipment.
4. Convection:
When a fluid, such as air or a liquid, is heated and then travels away from the source, it carries
the thermal energy along. This type of heat transfer is called convection. The fluid above a hot
surface expands, becomes less dense, and rises.At the molecular level, the molecules expand
upon introduction of thermal energy. As temperature of the given fluid mass increases, the
volume of the fluid must increase by same factor. This effect on the fluid causes displacement.
As the immediate hot air rises, it pushes denser, colder air down. This series of events represents
how convection currents are formed. The equation for convection rates is calculated as follows:
Q = hc ∙ A ∙ (Ts – Tf)
where Q = heat transferred per unit time; hc = convective heat transfer coefficient; A = heat-
transfer area of the surface; Ts = temperature of the surface; and Tf = temperature of the fluid.A
space heater is a classic convection example. As the space heater heats the air surrounding it near
the floor, the air will increase in temperature, expand, and rise to the top of the room. This forces
down the cooler air so that it becomes heated, thus creating a convection current.
5. Types of Convection
Natural Convection:
Natural convection is a method of heat transfer in which natural means influence the motion of
the fluid. There is no influence from external facts. This movement of molecules in the fluid is
due to the differences between densities of different regions of the same fluid. The density of a
fluid decreases when it heats and vice versa. That is because of the thermal expansion of the fluid
(the speed of molecules increase with the temperature increase, which results in the increase of
the volume of the fluid. Although the volume increases, the mass remains constant. Therefore the
density decreases).When we heat a fluid in a container from its bottom, the density of the bottom
layer of the fluid decreases. Then the lower density region tends to move to the top of the
container. Then the cooler fluid at the top of the container replaces the bottom region. This
continues, as a result, convection occurs.
Examples of natural convection include cooling down a boiled egg when kept in the normal air,
loss of cool of a cool drink can, etc. When considering the mechanism of natural convection,
first, the temperature of the outside of a hot object (kept in cold air) drops down. At the same
time, the temperature of the air adjacent to the object will rise due to heat transfer. Then the
density of this adjacent layer of air decreases. As a result, the air rises upward. Cold air will
replace this region. Then the convection continues. In the end, the object will cool down.
Forced Convection:
Forced convection is a method of heat transfer in which external means influence the motion of
the fluid. There, external sources such as pumping, fans, suction devices, etc. are useful in
generating the fluid motion. This method is very valuable because it can efficiently transfer heat
from a heated object. Some common examples of this mechanism include air conditioning, steam
turbines, etc.When considering the mechanism of forced convection, it is has a complicated
mechanism than the natural way. That is because, in this method, we have to regulate two
factors; fluid motion and heat conduction. These two factors have a strong connection since the
6. fluid motion can enhance the heat transfer. Ex: higher the rate of motion of the fluid, higher the
heat transfers
7. Radiation
Thermal radiation generates from the emission of electromagnetic waves. These waves carry the
energy away from the emitting object. Radiation occurs through a vacuum or any transparent
medium (either solid or fluid). Thermal radiation is the direct result of random movements of
atoms and molecules in matter. Movement of the charged protons and electrons results in the
emission of electromagnetic radiation.
All materials radiate thermal energy based on their temperature. The hotter an object, the more it
will radiate. The sun is a clear example of heat radiation that transfers heat across the solar
system. At normal room temperatures, objects radiate as infrared waves. The temperature of the
object affects the wavelength and frequency of the radiated waves. As temperature increases, the
wavelengths within the spectra of the emitted radiation decrease and emit shorter wavelengths
with higher-frequency radiation. Thermal radiation is calculated by using the Stefan-Boltzmann
law:
P = e ∙ σ ∙ A· (Tr
4 – Tc
4)
where P = net radiated power; A = radiating area; Tr = temperature of the radiator; Tc =
temperature of surroundings; e = emissivity; and σ = Stefan’s constant.Emissivity for an ideal
radiator has a value of 1. Common materials have lower emissivity values. Anodized aluminum
has an emissivity value of 0.9 while copper’s is 0.04.
8. Solar cell or photovoltaic cell, converts the energy of light into electricity via the photovoltaic
effect. Light is absorbed and excites the electrcon to a higher energy state and the electric
potential is produced by the separation of charges. Efficiency of solar panels has risen in recent
years. In fact, those currently being produced by SolarCity, a company co-founded by Elon
Musk, are at 22%.
Black Body Radiation
A black body or blackbody is an idealized physical body that absorbs all incidentelectromagnetic
radiation, regardless of frequency or angle of incidence. (It does not only absorb radiation; It can
also emit radiation.
Grey Bodies Radiation
Grey Bodies Heat Exchange. The easiest method to calculate radiative heat transfer between
two bodiesis when they are assumed to be black bodies. ... While J represents the radiosity which
is the total amount of radiation that is reflected off a surface per unit time and unit area.