Review of vapour absorption refrigeration and vapour. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. Although the initial cost of an absorption system is higher than that of a compression system, operational costs are much lower if waste heat is used. A novel numerical methodology for modelling simple vapour. Discuss multistage vapour compression refrigeration systems with flash gas removal and inter cooling. In this video explain how to solve numerical problem of simple vapour compression cycle.
Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. Design a vaporcompression refrigeration system that will maintain the refrigerated space at 15 c while operating in an environment at 20 c using refrigerant 4a as the working fluid. Vapour compression cycle energy management handbook sixth edition, chapter 8 refrigerator air conditioning plant heat pump refrigerator electricmotordriven. The vapor compression refrigeration cycle, step by step. Pharmaceutical vapor compression distillation vcd, improperly known as thermocompression or such as mechanical vapor recompression mvr or mechanical vapor compression mvc distillation, too, is the main way to produce wfi water for injection and grade waters for pharmaceutical use. Absorption of refrigerant vapour by a suitable absorbent or adsorbent.
Evaluation of vapour compression refrigeration system. Conclusion vapour refrigeration system requires large amount of energyto operate. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration. Vapour compression cycle generally known as vcc is a refrigeration cycle. A compressor is used to compress the vapour refrigerant. In this system the low pressure amonia vapour leaving the evaporator enters the absorber where it is absorbed by the. Explain vapour compression refrigeration cycle on ts and. The saline water is evaporated at subatmospheric pressure. Mar 26, 2007 by the second law of thermodynamics, heat energy does not spontaneously transfer from a cold to a hot reservoir. If you have any of the feasible scenarios for an absorption machine, we are always on your searchlist. Ppt refrigeration systems powerpoint presentation free. Therefore ph diagram is a convenient way of representing and calculating the vapour compression cycle.
View and download powerpoint presentations on vapor compression refrigeration cycle ppt. A single stage vapour compression refrigeration system has one low side pressure. Capacity range covers single effect from 100 to and double effect units from m3day to more than 2000 m3day. The vapour compression cycle is used in most of the modern refrigeration systems in large industrial plants. In the vapourcompression system, heat is provided by the compression of vapour rather than by direct heat input from a boiler. Vapour absorption system vapour absorption system is an attractive method for utilizing low grade energy directly for cooling. Introduction a single stage vapour compression refrigeration system has one low side. Experimental analysis of a vapour compression refrigeration system. The above figure shows simple vapour compression refrigeration system. The system has a main parts like compressor, condenser receiver, refrigerant control device and evaporator. Ueeneej103a establish the basic operating conditions of vapour compression systems modification history not applicable unit descriptor unit descriptor 1 1. In this type of refrigerator, refrigerant undergoes phase changes.
The result is vastly improved efficiency over other distillation methods. Both a steadystate and a transient simulation will be considered. The presentation will give you idea about the vapor compression refrigeration system. The vapour absorption system uses heat energy, instead of mechanical energy as in vapour compression systems, in order to change the conditions of the refrigerant required for the operation of the refrigeration cycle. The evaporating temperature is 25 oc and condensing temperature 47 oc. Figure 2proposed vapour compression refrigeration system using matrix heat exchanger v. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction.
Vapour compression system vapour absorption system. Vapor compression refrigeration system basic, working, parts of. The vapor compression cycle circulates a fluid through a compressor, condenser, expansion valve, and evaporator, in order to absorb heat from a refrigerated space at a low temperature and give off heat at a higher temperature to the surroundings, thus keeping the refrigerated space cool. Vaporcompression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles.
Simple vapour compression refrigeration system with. Layout of the r22 vapour compression refrigeration system. In this lesson, one will learn how to solve the problems on vapour compression cycle. In comparison, mechan ical vapour recompression permits the continuous recycling of this energy stream by recompressing the vapour to a higher pressure and therefore, a higher energy content. Also explain ts and ph diagram with calculate refrigeration effect in system. Tafe nsw training education support, industry skills unit meadowbank 2012. Performance analysis of vapour compression and vapour. Cop in vapor compression refrigeration analysis physics. A vapour compression cycle with wet vapour after compression is shown on ts and ph diagrams below. Vapour compression systems have mainly four elements in the refrigeration system i. In the vapour absorption system, an absorber, a pump, a generator and a pressurereducing valve replace the compressor. Chilled water is produced based on the principle that. The refrigerant absorbs heat from one place and releases it to another place.
Vapor compression evaporation is the evaporation method by which a blower, compressor or jet ejector is used to compress, and thus, increase the pressure of the vapor produced. Eames1 1centre for sustainable technologies, school of the built enviroment, university of ulster newtownabbey bt37 0qb, united kingdom. At the bottom of the articles you can download pdf. If the vapour is compressed after it has become dry and saturated then the vapour becomes superheated. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail. The thermodynamic efficiency is derived from the application of the heat pump principle by a large volumetric flow compressor acting as the heat pump. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. Vapour compression is a distillation process, where evaporation of sea or brackish water is obtained by the application of heat delivered by compressed vapour.
Development of vapour compression refrigeration cycle a k bajpai 1 and vivek dwivedi 2 it will be possible only if heat is transferred from the low temperature region to a high temperature region. Vapour compression refrigeration or vapor compression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. It is also used in domestic and commercial refrigerators, largescale. Theoretical vapour compression cycle with wet vapour after compression. Mechanism of simple vapor compression refrigeration system.
The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Here harshit solves some sample questions which will help one to recollect and remember all the topics and equations which were discussed in the previous lesson. What are the differences between vapour absorption and. Lecture 32 analysis of complete vapour compression system. Question part 2 steam jet refrigeration system seminar report download. Performance characteristics of vapour compression refrigeration system under real transient conditions j. Fundamental process and system design issues in co2 vapor. Mechanism and working of a vapour compression refrigeration system with pv and ts diagram mecholic no comments. Incoming water influent enters the system and runs through two heat exchangers which transfer heat to the influent from the outgoing pure water distillate and grey water concentrate. Discuss the use of flash tank for flash gas removal only. Rac 2 vapour compression refrigeration system duration. Vapor compression refrigeration systems are used for a variety of coolingrefrigeration applications. Vapor compression cooling for high performance applications. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects.
Vapor compression refrigeration transports large quantities of heat with a small mass of circulating fluid. Exery analysis of vapour compression refrigeration system 2517 the graph plotted above between the exer gy losses in different components vs condenser temperature reveals the fallowing points. Vaporcompression evaporation is the evaporation method by which a blower, compressor or jet ejector is used to compress, and thus, increase the pressure of the vapor produced. Vapour absorption refrigeration system departmen of mechanical engineerin figure 1. Layout of the r22 vapourcompression refrigeration system. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Highly compressed fluids tend to get colder when allowed to expand. We have been learning about fresh water generators and the procedure to operate such an fwg. Ppt vapour compression cycle powerpoint presentation free. The effect of compressing water vapour is obtained by means of an electrically driven, mechanical centrifugal compressor.
System description the layout of the system is shown in figure 1. Vapor compression system an overview sciencedirect topics. A simple schematic of a vapour absorption refrigeration system the absorption chiller is a machine, which produces chilled water by using heat such as steam, hot water, gas, oil etc. Seminar presentation on vapour compression refrigeration. Before moving further on differences lets have an overview of both the vapour compression. Vapour compression refrigeration systems presentation transcript. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy.
The cycle depicted in figure 1 offers several advantages for electronic cooling applications. Vapor compression distillation fresh water generator. Multistage vapour compression refrigeration systems nptel. In this type of fresh water generators, the evaporation takes place at positive pressure, slightly above atmospheric pressure. As energy crisis is big problem in the world there is a need of decreasing power consumption of electricity. Vapour compression cycle definite guide with video. Ph diagram of vapor compression refrigeration cycle generally, the. Apr 18, 2014 complete vapour compression refrigerationp p p g systems. Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator submitted by seyfettin yildiz in partial fulfillment of the requirements for the degree of master of science in mechanical engineering department, middle east technical university by, prof. Find powerpoint presentations and slides using the power of, find free presentations research about vapor compression refrigeration cycle ppt. Items to include in your report the following items apply to a report, therefore treat as applicable. Discuss the use of flash tank for inter cooling only. Exergy analysis of vapour compression refrigeration system.
In conventional evaporators, the energy content of the vapour stream pro duced is lost to a large extent or is only partially used. Download this books into available format unlimited. Vapour compression cycle powerpoint ppt presentation. Vaporcompression refrigeration, in which the refrigerant undergoes phase changes.
For example, in frozen food industries the required. If you continue browsing the site, you agree to the use of cookies on this website. It is also used in domestic and commercial refrigerators, largescale warehouses for. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many. Vapor compression refrigeration system pressureenthalpy diagram for refrigerants refrigerator, air conditioner, thermoelectric cooler, heat pump designation, choice, criteria for selection, and characteristics of refrigerants alternatives to vapor compression refrigeration system heat transfer in refrigeration applications. Ppt vapour compression cycle powerpoint presentation, free. Ppt desalination powerpoint presentation free to download. Vapor compression systems can reject heat far from the source by separating the evaporator and condenser in a socalled split system. Simple vapour compression refrigeration system slideshare.
In a vapour compression refrigeration system, the compressor plays a key role on the power consumption and its overall performance is a result of electrical, mechanical and thermodynamic efficiencies. Compression refrigeration system vapour absorption refrigeration system. This paper presents a novel methodology for predicting the steadystate performance of a simple vapour compression refrigeration system based on a physical model approach. Technology and applications gea engineering for a better world.
Apr 02, 2016 vapour compression refrigeration system 1. Ppt vapour compression cycle powerpoint presentation. The vapour at low pressure and low temperature point 2 enters to compressor where it is compressed reversible adiabatically isentropically. Vapour compression refrigeration systems ppt video online. Mar 09, 2016 comparison of vapor absorption system with vapor compression system can be done in 9 aspects, they are energy input, moving part, evaporator pressure, load variation, evaporator exit, coefficient of performance, capacity, refrigerant and lowest temperatures. The liquid refrigerant extracts the heat from the substances kept in. Ueeneej103a establish the basic operating conditions of vapour compression systems. The system has a main parts like generator, rectifier, condenser absorber and evaporator. Download scientific diagram ph diagram of vapor compression refrigeration cycle. Some of the compressed and heated vapour is then recycled through a series of tubes passing through. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. A free powerpoint ppt presentation displayed as a flash slide show on id. However, the modelling of the different components of the system is not determined exclusively on the basis of physical laws, and some empirical correlations are used.
Vapor absorption heat pump basics ppt authorstream. Comparison of vapor absorption system with vapor compression system can be done in 9 aspects, they are energy input, moving part, evaporator pressure, load variation, evaporator exit, coefficient of performance, capacity, refrigerant and lowest temperatures. As can be seen, the liquid leaving the condenser is cooled by passing through the throttle valve, where the pressure drops, resulting in partial vaporisation of the refrigerant and a significant reduction in temperature. Vapour compression systems are used for refrigeration and air conditioning. Simple vapour compression system mechanical engineering. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Jun 19, 2014 it is a type of common refrigeration system. Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2.
Aquachem uses vapor compression vc for most of its distillation systems, a process that uses its own compressed steam as its primary heat source. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. Vapour absorption refrigeration system authorstream. In addition to the basic components, an actualp, vapour compression refrigeration consists of several accessories for safe and satisfactoryy functioning of the system. The mechanical vapor compression mvc distillation is inherently the most thermodynamically efficient process of singlepurpose thermal desalination plants. Vapor compression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for airconditioning of buildings and automobiles.
View and download powerpoint presentations on vapour pressure ppt. The vapour in this cycle is circulated through the various components of the system, where it undergoes a number of changes in its state or condition. Ueeneej103a establish the basic operating conditions of. It encompasses working safely, determining refrigerant. Comparison of vapor absorption system with vapor compression. Example refrigeratorheat pump an refrigerator has an cooling capacity of 500 w. The vapor compression refrigeration cycle consists of four processes. Since the pressure increase of the vapor also generates an increase in the condensation temperature, the same vapor can serve as the heating medium for its mother.
The refrigeration capacity is 8 tr and the compression is adiabatic reversible process. Vapor compression distillation numbers reference the points in the diagrams above and below 1. Vc cycle on ts diagram it is worth noting that two of the processes are at constant pressure and one is at constant enthalpy. The ph and ts diagram for the simple vapor compression refrigeration cycle is shown in the figure for vapour entering the compressor is in dry saturation condition the dry and saturated vapour entering the compressor at point 1 that vapour compresses isentropic ally from point 1 to 2 which increases the pressure from evaporator pressure to condenser. The effect of superheating on vapour compression system. The effect of this superheating of vapour on the performance of the cycle cop can be studied from this diagram. Vapor compression refrigeration cycle ppt xpowerpoint.
Due to its high efficiency, it becomes the obvious choice for a single purpose, smallcapacity installation. Fundamental process and system design issues in co2 vapor compression systems article in progress in energy and combustion science 302. In this cycle, the enthalpy at point 2 is found out with the help of dryness fraction at this point. Complete vapour compression refrigerationp p p g systems. Vapour compression refrigeration system slideshare. When the vapour is rapidly compressed, its temperature rises. Scribd is the worlds largest social reading and publishing site. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats.
The vapour compression refrigeration and vapour absorption refrigeration systems were developed around 1870. Obviously it is not possible in the natural manner because heat flows from high. Our vapor compression distillers use only about half the energy of multieffect distillation, providing you high purity. Other articles where vapour compression distillation is discussed. Find powerpoint presentations and slides using the power of, find free. Kasana4 1 research scholar, department of mechanical engineering, national institute of technology kurukshetra6119, haryana, india 2 dairy engineering division, national dairy research. Download this books into available format 2019 update. In order to have heat transfer in that direction and not from from hot to cold, as the system is naturally inclined to do, it is necessary to do work on the system. Since the pressure increase of the vapor also generates an increase in the condensation temperature, the same vapor can serve as the heating medium for its mother liquid or solution being concentrated, from which the.
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