The document discusses vapor-absorption refrigeration systems. It provides a history of vapor-absorption systems dating back to the 1700s. It then describes the basic components and process of vapor-absorption refrigeration systems. Finally, it outlines several types of vapor-absorption refrigeration systems including single-effect, double-effect, absorption heat transformer, and diffusion absorption refrigeration systems.
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
The ppt contains detailed study of Vapor Absorption Refrigeration System with neat sketches and description. It is well formed as per the syllabus of GTU
vapor absorption system,three fluid vapor absorption system,water and ammonia vapor absorption system water and lithium bromide vapor absorption system
An ejector refrigeration cycle powered by an internal combustion engine. it is a ppt for presentation, including introduction, working principle, performance of an ejector refrigeration.
.
introduction of VARS,refrigrants properties,cop,practical VARS ,
Simple VARS,advantages of VARS,comparison of vars with vcrs,Refrences of VARS,Refrigration cycles,economical system,absorbent properties
SOLAR POWER VAPOUR ABSORPTION REFRIGERATION SYSTEMaj12345ay
USE OF SOLAR POWER IN REFRIGERATION SYSTEM
The power incident from the sun to the earth has very much amount of energy that the present consumption rate of all the commercial and general uses. We utilize only 0.1% of total incident sun energy on the surface of earth. Thus solar energy can fulfill our present as well as future needs of energy. That is a reason it called renewable sources of energy. It is also environmental clean source of energy and available at whole part of world where people live. Using of solar energy in the field of refrigeration and air conditioning system it become very economical.
In our project we provide solar heat in generator for heating purpose of vapor compression refrigeration system.
For past few decades, energy has played a prominent role in the development of technology and economy. Energy has now become inevitable factor for production as well. The objective of this project is to develop an environment friendly vapour absorption system. Vapour absorption system uses heat energy, instead of mechanical energy as in vapour compression system, in order to change the condition of refrigerant required for the operation of the cycle. R 717(NH3) and water are used as working fluids in this system. The basic idea of this project is derived from the solar heating panel to obtain heat energy, instead of using any conventional source of heat energy. In this project various observations are done by varying operating conditions related to heat source, condenser, absorber and evaporator temperatures. The drawback of this system is that, it remains idle in the cloudy weather conditions.
COMPONENTS USED IN SOLAR POWERED AQUA-AMMONIA VAPOUR ABSORPTION SYSTEM
• ABSORBER
• PUMP
• HEAT EXCHANGER
• GENERATOR
• SOLAR PANEL
• CONDENSER
• EXPANSION VALVE
• EVAPORATOR
• DC BATTERY
• FAN
STEAM JET COOLING SYSTEM
Steam jet cooling system is a cooling technique which involves usage of steam and water for cooling purposes. In steam jet refrigeration systems, water can be used as the refrigerant. Like air, it is perfectly safe. These systems were applied successfully to refrigeration.
•Temperatures attained using water as a refrigerant are in the range which may satisfy air conditioning, cooling, or chilling requirements.
•Mostly low-grade energy and relatively small amounts of shaft work.
•This system are the utilization of mostly low-grade energy and relatively small amounts of shaft work.
•Not used when temperatures below 5°C are required.
The ppt contains detailed study of refrigerants used in refrigeration and air conditioning system with description. It is well formed as per the syllabus of GTU.
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
An ejector refrigeration cycle powered by an internal combustion engine. it is a ppt for presentation, including introduction, working principle, performance of an ejector refrigeration.
.
introduction of VARS,refrigrants properties,cop,practical VARS ,
Simple VARS,advantages of VARS,comparison of vars with vcrs,Refrences of VARS,Refrigration cycles,economical system,absorbent properties
SOLAR POWER VAPOUR ABSORPTION REFRIGERATION SYSTEMaj12345ay
USE OF SOLAR POWER IN REFRIGERATION SYSTEM
The power incident from the sun to the earth has very much amount of energy that the present consumption rate of all the commercial and general uses. We utilize only 0.1% of total incident sun energy on the surface of earth. Thus solar energy can fulfill our present as well as future needs of energy. That is a reason it called renewable sources of energy. It is also environmental clean source of energy and available at whole part of world where people live. Using of solar energy in the field of refrigeration and air conditioning system it become very economical.
In our project we provide solar heat in generator for heating purpose of vapor compression refrigeration system.
For past few decades, energy has played a prominent role in the development of technology and economy. Energy has now become inevitable factor for production as well. The objective of this project is to develop an environment friendly vapour absorption system. Vapour absorption system uses heat energy, instead of mechanical energy as in vapour compression system, in order to change the condition of refrigerant required for the operation of the cycle. R 717(NH3) and water are used as working fluids in this system. The basic idea of this project is derived from the solar heating panel to obtain heat energy, instead of using any conventional source of heat energy. In this project various observations are done by varying operating conditions related to heat source, condenser, absorber and evaporator temperatures. The drawback of this system is that, it remains idle in the cloudy weather conditions.
COMPONENTS USED IN SOLAR POWERED AQUA-AMMONIA VAPOUR ABSORPTION SYSTEM
• ABSORBER
• PUMP
• HEAT EXCHANGER
• GENERATOR
• SOLAR PANEL
• CONDENSER
• EXPANSION VALVE
• EVAPORATOR
• DC BATTERY
• FAN
STEAM JET COOLING SYSTEM
Steam jet cooling system is a cooling technique which involves usage of steam and water for cooling purposes. In steam jet refrigeration systems, water can be used as the refrigerant. Like air, it is perfectly safe. These systems were applied successfully to refrigeration.
•Temperatures attained using water as a refrigerant are in the range which may satisfy air conditioning, cooling, or chilling requirements.
•Mostly low-grade energy and relatively small amounts of shaft work.
•This system are the utilization of mostly low-grade energy and relatively small amounts of shaft work.
•Not used when temperatures below 5°C are required.
The ppt contains detailed study of refrigerants used in refrigeration and air conditioning system with description. It is well formed as per the syllabus of GTU.
Need for cooling of an aircraft. types of air-refrigeration system, DART, Advantages of air refrigeration system, Open and closed cycle air refrigeration,
The Stirling engine is noted for its high efficiency compared to steam engines, quiet operation, and the ease with which it can use almost any heat source.This engine is currently exciting interest as the core component of micro combined heat and power (CHP) units, in which it is more efficient and safer than a comparable steam engine.
What is first law of Thermodynamics?
What is a Thermodynamic cycle?
Types of Thermodynamic cycles
What is a Refrigeration Cycle?
Types of Refrigeration cycles
What is a Refrigeration System?
Principle of working of a Refrigeration System
Other Refrigeration systems
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.
Vapor compression refrigeration cycle, Refrigerants,
Coefficient of performance, Capacity, Factors affecting Refrigeration and Air conditioning
system performance and savings opportunities.
Vapor absorption refrigeration system: Working principle, Types and comparison with
vapor compression system, Saving potential
Generation of Air Conditioning by using Exhaust Gases and Cooling Water of an...ijtsrd
Air conditioning system of car or buses works on principle of vapor absorption cycle of refrigeration VAR . This system reduces the fuel economy of fuel of vehicle. When vehicle moving with air conditioning, it consumes more amount of fuel than vehicle rubs without AC, typically, it consumes 15 to 20 more amount of fuel. Exhaust gases coming from engine of vehicle have temperature ranges to 300 to 400 degree centigrade at full load it carries 25 to 30 of heat supplied by fuel. For A.C. of an automobile, the heat of exhaust gases is utilized to run vapor absorption refrigeration cycle instead of vapour compression refrigeration system. Resulting, it improves fuel economy of A. C. heavy vehicle. In this project try to integrate the vapor absorption refrigeration system with car or bus or heavy vehicle engine exhaust. Comparative study has been carried out when car running with VCR and vapor absorption system of refrigeration. Dr. M. Sampath Kumar | Karthik Payam | Rajesh Medi | Srikanth Chennam | Aditya Mothukuri ""Generation of Air Conditioning by using Exhaust Gases and Cooling Water of an Automobile Engine"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23318.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23318/generation-of-air-conditioning-by-using-exhaust-gases-and-cooling-water-of-an-automobile-engine/dr-m-sampath-kumar
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.
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.
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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.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
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.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
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.
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.
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.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
2. TABLE OF CONTENTS REFRIGERATION SYSTEM
• Description
• History of Vapor-absorption Refrigeration System
• Types of Vapor-absorption Refrigeration System
• Types of Vapor-absorption Refrigeration System
• Principles of process flow
• COP of Vapor-absorption Refrigeration System
• Properties of Ideal Refrigerant and Absorbent
• Advantages and Disadvantages of Vapor-absorption
Refrigeration System
• References
3. DESCRIPTION
VAPOR-ABSORPTION REFRIGERATION SYSTEM
It is a binary solution consisting of refrigerant and absorbent.
Ex. 1. Ammonia – Water Absorption Refrigeration System
Ammonia is used as the refrigerant and the water is used as
the absorbent.
2. Water – Lithium Bromide Absorption Refrigeration System
Water is used as the refrigerant while Lithium bromide is used
as the absorbent.
REFRIGERATION SYSTEM
The main motive is to raise the temperature of the
refrigerant from evaporator pressure to condenser
pressure.
It is quite similar to Vapor Compression system.
Condensation and evaporation takes place at two different
pressure levels to achieve refrigeration.
4. HISTORY REFRIGERATION SYSTEM
The early development of an absorption cycle dates
back to the 1700’s. It was known that ice could be
produced by an evaporation of pure water from a
vessel contained within an evacuated container in
the presence of sulfuric acid.
In 1810, ice could be made from water in a
vessel, which was connected to another
vessel containing sulfuric acid. As the acid
absorbed water vapor, causing a reduction
of temperature, layers of ice were formed
on the water surface.
5. TABLE OF CONTENTS REFRIGERATION SYSTEM
In 1859 , Ferdinand Carre introduced
a novel machine using
water/ammonia as the working fluid.
This machine took out a US patent in 1860.
Machines based on this
patent were used to make
ice and store food. It was
used as a basic design in
the early age of
refrigeration development.
6. TABLE OF CONTENTS REFRIGERATION SYSTEM
In the 1950’s, a system using lithium
bromide/water as the working fluid was
introduced for industrial applications. A
few years later, a double-effect
absorption system was introduced and
has been used as an industrial standard
for a high performance heat-operated
refrigeration cycle.
7. TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM REFRIGERATION SYSTEM
• Absorption heat transformer
• Multi-effect absorption refrigeration cycle
• Absorption refrigeration cycle with GAX
• Absorption refrigeration cycle with an absorber-heat-
recovery
• Half-effect absorption refrigeration cycle
• Combined vapor absorption-compression cycle
• Sorption-resorption cycle
• Dual-cycle absorption refrigeration
• Combined ejector-absorption refrigeration cycle
• Osmotic-membrane absorption cycle
• Self-circulation absorption system using LiBr/water
• Diffusion absorption refrigeration system
8. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Absorption heat transformer
This system uses heat from an intermediate temperature
reservoir as the driving heat (normally from industrial waste heat).
The system rejects heat out at a low temperature level (normally to
the surroundings). The useful output is obtained at the highest
temperature level.
The use of an absorption
heat transformer allows any
waste heat to be upgraded
to a higher temperature level
without any other heat input
except some work required
to circulate the working
fluid.
9. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Multi-effect absorption refrigeration cycle
The main objective of a higher effect cycle is to increase system
performance when high temperature heat source is available. By the
term “multi-effect”, the cycle has to be configured in a way that heat
rejected from a high-temperature stage is used as heat input in a
low-temperature stage for generation of additional cooling effect in
the low-temperature stage.
Double-effect absorption refrigeration
cycle was introduced during 1956 and 1958. A
system using LiBr/water.
10. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Multi-effect absorption refrigeration cycle
High temperature heat from an external source supplies to the
first-effect generator. The vapor refrigerant generated is condensed
at high pressure in the second-effect generator.
The heat rejected is used to produce
addition refrigerant vapor from the solution
coming from the first-effect generator.
This system
configuration is
considered as a
series-flow-double-
effect absorption
system.
11. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Multi-effect absorption refrigeration cycle
If LiBr/water is
replaced with
water/NH3, maximum
pressure in the first-
effect generator will be
extremely high.
In contrast to the system for LiBr/water, this system can be
considered as a combination of two separated single-effect cycles.
The evaporator and the condensers of both cycles are integrated
together as a single unit as shown.
12. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Absorption refrigeration cycle with GAX
GAX stands for generator/absorber heat exchanger or sometimes
is called DAHX which stands for desorber/absorber heat exchanger.
Higher performance can be achieved with a single-effect absorption
system. Referring to the parallel-flow-doubleeffect absorption system
mentioned earlier, the system consists of two single-effect cycles
working in a parallel manner.
The concept of GAX is to simplify this twostage-
double-effect absorption cycle but still produce the
same performance. The ideal of GAX was introduced
in 1911 by Altenkirch and Tenckhoff
13. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Absorption refrigeration cycle with GAX
An absorber and a generator may be considered as a counter-flow-heat
exchanger. At the absorber, weak-refrigerant solution from the generator and vapor
refrigerant from the evaporator enter at the top section.
At the generator, rich-refrigerant solution from the absorber
enters at the top section. In this section, the refrigerant is dried out
from the solution as it is heated by using the heat rejected from the
top section of the absorber.
Therefore, a single-
effect absorption system
can provide as high COP
as that for the two-stage-
double-effect absorption
system by using GAX.
14. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Absorption refrigeration cycle with an absorber-heat-recovery
Similar to the GAX system, the absorber is divided into two
sections. Heat is rejected out at a different temperature. The lower
temperature section rejects heat out to the surroundings as usual.
15. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Half-effect absorption refrigeration cycle
The half-effect absorption system was introduced for an application
with a relatively low-temperature heat source . The system
configuration is exactly the same as the double-effect absorption
system using water/NH3 except the heat flow directions are different.
high temperature heat from an external source transfers to both
generators. Both absorbers reject heat out to the surroundings.
The cycle with absorber heat recovery uses
heat of absorption to preheat the outgoing
stream from the absorber to the generator.
16. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Half-effect absorption refrigeration cycle
Absorber II and generator I are operated at an intermediate pressure
level. Therefore, the circulation rate between generator I and
absorber I and between generator II and absorber II can be
maintained at acceptable levels.
It must be noted that COP
of the half-effect
absorption system is
relatively low as it rejects
more heat than a single-
effect absorption cycle
around 50% However, it
can be operated with the
relatively low
temperature heat source.
17. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Combined vapor absorption-compression cycle
Vapor absorption/compression cycle proposed by Cacciola, employs
two combinations of working fluids, water/NH3 and KHO/water. This
is a compromise of the water/NH3 cycle and KHO/water cycle. The
highest system pressure is reduced and the rectifier of water/NH3
system is abstained.
This cycle can be operated
with an ambient temperature
lower than 0°C without
freezing or crystallization
problems.
18. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Sorption-resorption cycle
Altenkirch introduced the idea of a sorption-resorption cycle in
1913. The cycle employs two solution circuits instead of only one.
The condenser and evaporator section of a conventional single-effect
absorption system is replaced with a resorber and a desorber
respectively.
This provides more flexibility
in the cycle design and
operations. The solution loops
concentrations can be varied
allowing adjustment of the
component temperatures and
pressures to the application
requirement.
19. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Dual-cycle absorption refrigeration
The concept of a dual-cycle absorption system is similar to a
parallel-double-effect absorption system. However, this system
consists of two completely separated cycles using different kinds of
working fluid. Hanna et al. invented a dual-cycle absorption
refrigeration and heat pump This system consists of two single-effect
absorption cycles using water/NH3 and LiBr/water.
20. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Combined ejector-absorption refrigeration cycle
An ejector can be used to improve performance of an absorption
refrigeration system. One notable approach devised by
Kuhlenschmidt. The aim is to develop an absorption system using
working fluid based on salt absorbent, capable of operating at low
evaporator temperatures and employing an air-cooled absorber.
This system employs two-
stage generators similar to
that used in a doubleeffect
absorption system.
21. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Combined ejector-absorption refrigeration cycle
Another approach of using ejector with an absorption system
was introduced by Chung and Chen Similar to Kuhlenschmidt, an
ejector is used to maintain an absorber pressure at a level higher
than that in the evaporator. In contrast to the previous system, the
ejector’s motive fluid is the highpressure liquid solution from the
generator.
22. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Combined ejector-absorption refrigeration cycle
Another approach proposed by Aphornratana and Eames An
ejector is placed between a generator and a condenser of a single-
effect absorption system. LiBr/water is used as the working fluid. The
ejector uses high-pressure water vapor from the generator as the
motive fluid.
Thus, the generator is
operated at a pressure higher
than the condenser. This
allows the temperature of
the solution to be increased
without danger of
crystallization.
23. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Osmotic-membrane absorption cycle
This system was proposed by Zerweck, The system consists of a
condenser and an evaporator as usual. Rich-refrigerant solution in
the absorber and weak-refrigerant solution in the generator are
separated from each other by using an osmotic membrane. The
osmotic membrane allows only the refrigerant to pass.
Thus, the refrigerant
from the absorber can
be transferred to the
generator by an
osmotic diffusion effect
through the membrane
without any mechanical
pump.
24. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Self-circulation absorption system using LiBr/water
Yazaki Inc. of Japan introduced a self-circulate absorption
refrigeration system based on a single-effect system using LiBr/water.
Using water as a refrigerant, differential pressure between the
condenser and the evaporator is very low and can be maintained by
using the principle of hydrostatic-head.
The solution from the
absorber can be circulated
to the generator by a
bubble pump. The weak-
refrigerant solution returns
gravitationally back to
absorber.
25. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Diffusion absorption refrigeration system
DAR is another type of self-circulate
absorption system using water/NH3. As NH3 is
the working fluid, differential pressure between
the condenser and the evaporator is too large
to be overcome by a bubble-pump. The concept
of DAR was proposed by Platen and Munters,
students at the Royal Institute of Technology,
Stock-holm.
26. REFRIGERATION SYSTEM
TYPES OF VAPOR-ABSORPTION
REFIGERATION SYSTEM
Diffusion absorption refrigeration system
A diffusion absorption
refrigerator; DAR, schematic
diagram is proposed. This system
was once widely used as a
domestic refrigerator as no
electricity is required in its
operation. NH3/water/auxiliary
gas is charged in the machine as
the working fluid.