The document discusses different types of refrigeration systems including vapour absorption refrigeration (VAR) systems, vapour compression refrigeration (VCR) systems, and magnetic refrigeration systems. It provides details on the basic working principles of VAR systems including the use of an absorber, generator, condenser, and evaporator. Ammonia-water and lithium-bromide water are commonly used refrigerant-absorbent combinations. Absorption systems have advantages over compression systems like being quieter and able to operate using thermal energy. A domestic Electrolux refrigerator that uses the VAR principle is also described.
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
Aircraft refrigeration system (air cooling system)Ripuranjan Singh
Aircraft air refrigeration systems are required due to heat transfer from many external and internal heat sources (like solar radiation and avionics) which increase the cabin air temperature. With the technological developments in high-speed passenger and jet aircraft's, the air refrigeration systems are proving to be most efficient, compact and simple. Various types of aircraft air refrigeration systems used these days are.
Simple air cooling system
Simple air evaporative cooling system
Boot strap air cooling system
Boot strap air evaporative cooling system
Reduced ambient air cooling system
Regenerative air cooling system
COMPRESSOR EFFICIENCY AND TURBINE EFFICIENCY.
Comparison of Various Air Cooling Systems used for Aircraft ON basis of dart
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
It will help to the students of Mechanical Engineering. These notes are according to HVAC Subject. Some important topics are here for your good understanding. These are written in easy language, u can understand easily.
Refrigeration And Air Conditioning Cycle.docxrohangiri15
I am going to publish my first document todat and hope that all the readers like my document. This helps the students and teachers to study about refrigeration and air conditioning system, their componrnts and the working principle.
Thanks yo all.
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.
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.
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.
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.
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.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
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.
Immunizing Image Classifiers Against Localized Adversary Attacks
Rwfrigeration working principle
1. Working of VARS system
Submitted to :
Navneet Goyal
(Mech. Department, SLIET)
Presented By :
Sandeep Pathak
Reg. No-GWT/SL/14/1609
ROLL No.-1436155
2. Contents
Basic concept and VCRS System
Introduction of VARS
Simple Vapour Absorption System
Practical Vapour Absorption System
Properties of Ideal Refrigerant and Absorbent
Properties of Ideal Refrigerant-Absorbent combination
Advantages of Absorption system over Compression system
Domestic Electrolux Refrigerator
Principle & Working of Domestic Electrolux refrigerator
Advantages & Disadvantages of Domestic Electrolux Refrigerator
Solar refrigeration system
Magnetic refrigeration system
4. Basics
Refrigeration is the removal of heat from a material or space, so that it’s temperature is
lower than that of it’s surroundings.
When refrigerant absorbs the unwanted heat, this raises the refrigerant’s temperature
(“Saturation Temperature”) so that it changes from a liquid to a gas — it evaporates. The
system then uses condensation to release the heat and change the refrigerant back into a
liquid. This is called “Latent Heat”.
This cycle is based on the physical principle, that a liquid extracts heat from the surrounding
area as it expands (boils) into a gas.
To accomplish this, the refrigerant is pumped through a closed looped pipe system.
The closed looped pipe system stops the refrigerant from becoming contaminated and
controls its stream. The refrigerant will be both a vapor and a liquid in the loop.
5. “Saturation Temperature” – can be defined as the temperature of a liquid, vapor,
or a solid, where if any heat is added or removed, a change of state takes place.
A change of state transfers a large amount of energy.
At saturation temperature, materials are sensitive to additions or removal of heat.
Water is an example of how saturation property of a material, can transfer a large amount of heat.
Refrigerants use the same principles as ice. For any given pressure, refrigerants have a saturation
temperature.
If the pressure is low, the saturation temperature is low. If pressure is high, saturation temperature is
high.
“Latent Heat”- The heat required to change a liquid to a gas (or the heat that must be
removed from a gas to condense it to a liquid), without any change in temperature.
Heat is a form of energy that is transferred from one object to another object.
Heat Is a form of energy transferred by a difference in temperature.
Heat transfer can occur, when there is a temperature difference between two or more objects. Heat will
only flow from a warm object to a colder object.
The heat transfer is greatest, when there is a large temperature difference between two objects.
9. VARS SYSTEM
It is a heat operated system.
It is quite similar to Vapour Compression systems. Condensation and
evaporation takes place at two different pressure levels to achieve
refrigeration.
The main motive is to raise the temperature of the refrigerant from evaporator
pressure to condenser pressure.
Here refrigerant is dissolved in inert liquid in absorber and pumped to
condenser.
After raising pressure of refrigerant it is separated from solution by heating.
After condensation in condenser, refrigerant is throttled by expansion valve
and then it evaporates in evaporator providing the refrigeration effect.
10. Simple vapour absorption system
Ammonia vapour from evaporator is
absorbed by water in absorber.
Condensation heat released is absorbed
by cooling water.
After being pumped to generator, heat is
supplied which gives ammonia vapour.
Weak sol. sent back to absorber.
High pressure vapour is condensed to high
pressure liquid ammonia in condenser.
Liquid ammonia is throttled by expansion
valve, and then it evaporates absorbing
heat from evaporator.
Simple Vapour Absorption System
11. Practical vapour absorption system
Water vapours if reach condenser may block the
expansion valve. Therefore, analyser-rectifier is
used practically.
Analyser : Strong solution flows down the trays.
Due to high saturation temperature water
condenses down and 𝑁𝐻3 vapours escape
through.
Rectifier : A water cooled heat exchanger which
further condenses water vapour. (If any left)
Heat Exchanger : Used to cool weak solution
from generator. It also heats the strong solution
coming from pump, thereby reducing heat to be
supplied at generator, increasing economy.
Practical Vapour Absorption System
12. Properties of ideal refrigerant & absorbent
Properties of ideal refrigerant :
It should boil b/w 2˚-10 ˚C and
condense at 40 ˚C or above.
(pressure around atmospheric)
Large latent heat of vaporization.
High critical temperature.
Low specific heat.
Stability in complete cycle.
Properties of ideal absorbent :
Greater affinity for refrigerant.
Heat released during absorption of
refrigerant should be minimum.
High boiling point.
Low specific heat.
Chemical stability.
13. Properties of ideal refrigerant-absorbent combination
Refrigerant should have high affinity for absorber at low temperatures &
less affinity at high temperatures.
Mixture should have low specific heat and viscosity.
It should be non-corrosive, non toxic, non flammable and non irritating.
Large difference in normal boiling points of refrigerant and absorbent.
Commonly used combinations in air-
conditioning applications :
• Ammonia-water
• Lithium-bromide water
14. Advantages of absorption system over compression
system
No moving part except pump-motor, which is comparatively smaller than
compressor system.
Quiet in operation, low maintenance cost.
Can work only with thermal energy as an input.
Can be built for huge working capacities. (even for above 1000 TR)
Can be operated at designed C.O.P’s or even at part loads by varying
generator temperature.
Space and Auto. control requirements favour absorption system.
15. Principle & working of Electrolux refrigerator
Principle : If a liquid is exposed to an
inert atmosphere, it will evaporate
until atmosphere becomes saturated
with the liquid vapours. Evaporation
thus produces cooling effect.
Working :
Liquid 𝑁𝐻3 evaporates into 𝐻2 gas
at low temperature in evaporator.
𝑁𝐻3 + 𝐻2 mixture enters absorber
where 𝑁𝐻3 is absorbed in water,
𝐻2 returns back.
Strong sol. 𝑁𝐻3 in 𝐻2 𝑂 goes to
generator, where it is heated and
vapours then go to water
Working cycle of Electrolux Refrigerator
16. Points worth noting (for
Electrolux ref.)
Complete cycle is carried
out entirely by flow of
gravity of refrigerant.
With this type of machine,
efficiency is not important
since the energy input is
very small.
Due to low C.O.P, it cannot
be used for industrial
purposes.
Helps in maintaining uniform total
pressure throughout the system.
Permits the refrigerant to
evaporate at low temperature in
evaporator, corresponding to its
partial pressure.
ROLE OF HYDROGEN
17. Advantages
(Electrolux ref.)
No pump/compressor
required.
No mechanical troubles, low
maintenance.
No lubrication required, no
wear-tear.
Completely leak proof.
Noiseless.
Easy control, only by heat
input.
More complicated in
construction and working.
Low C.O.P.
If spoiled once, cannot be
repaired and has to be
replaced fully.
DISADVANTAGES
(ELECTROLUX REF.)
18.
19. • Utilisation of solar energy for cooling purpose
• In this system ,solar energy is coupled with
vapour absorption refrigeration system
• So,the power is supplied by solar energy
Magnetic Refrigeration
•Magnetic refrigeration is a cooling technology based on
the magneto caloric effect.
•It is used to attain temperature well below 1 Kelvin