The coefficient of performance of a refrigeration system is. Nptel mechanical engineering refrigeration and air. The use of alternative refrigerants instead of conventional refrigerants has also been addressed. It can be used whenever a refrigeration or airconditioning requirement occurs. Strong solution of ammonia is formed in the absorber, dissolving fairly dry ammonia vapour in cold water. The vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. The cooling effect produced by refrigeration system is based on simple principle of operation, that a heat flux is absorbed from a room, and evacuated to exterior. Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. Gases give off large amounts of heat when condensed into a. Vapour compression cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used. Vapour absorption refrigeration system ppt free download as pdf file.
The governing equations for the energetic and exergetic analysis of twostage vcr system have been identified and presented. The principle of the system is to make use of two substances that can be separated when heated. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Everything you need to know about refrigeration two types of absorption air conditioners are as follows double stage vapour absorption refrigeration machine short notes on vapour compression refrigeration cycle here is your free essay. To get acquainted with a vaporcompression refrigeration system to be able to use pressureenthalpy diagrams and tables to determine the c. Vapour compression system uses r4a refrigerant and vapour absorption system has ammonia water refrigerant pair. In domestic refrigerators, the most used cooling system is vapour compression, as it. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. The absorption systems have experienced many ups and downs. Since jacob perkins ice machine built in 1834, vapor compression refrigeration cycle vcrc has been in service of human beings. To study various controls used in refrigeration and airconditioning system.
Design of two stage vapour compression refrigeration. Basic refrigeration cycle and concepts, standard rating of refrigerating machines. Vapor compression refrigeration an overview sciencedirect. The vapour compression refrigeration system is an improved type of air refrigeration system using a liquid refrigerant as medium. This paper deals with the evaluation of the performance of a refrigeration system by using different refrigerant mixtures. Vapour compression refrigera tion system, refrigerant, ozone depletion, global warming, cfc. The vapor compression refrigeration cycle, step by step araner. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. Hrnjak, in 8th international conference on compressors and their systems, 20. Vapour compression cycle generally known as vcc is a refrigeration cycle. If you continue browsing the site, you agree to the use of cookies on this website. The absorption was the predecessor of the vapour compression system in 19th century and aqua ammonia system enjoyed wide applications in domestic refrigerators and large industrial installations in the chemical and process industries.
In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. Representation of vapour compression refrigeration. Pdf vapour compression refrigeration shubham maurya. Pdf textbook of refrigeration and airconditioning by r. Layout of the r22 vapourcompression refrigeration system. Design of two stage vapour compression refrigeration system. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. 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. Refrigeration cycle is the basis of all refrigeration systems.
Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Briefly explain the fundamental principles that make the compressionrefrigeration cycle work. Pdf vapour compression refrigeration system generating. Design and construction of a vapour compression refrigeration system as test rig to investigate the performance of liquefied petroleum. Numerical simulation of vapour compression refrigeration system. Dec 31, 2016 vapour compression refrigeration system 1. Vapour compression refrigeration system free download as powerpoint presentation. Figure below is a schematic of the components and flow arrangements for the vapor compression cycle. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration.
The vapor compression refrigeration cycle involves four components. Vapour compression refrigeration cycle mcqs with answers. Factorybuilt equipment will be constructed to the relevant standards and will be pressuretested for safety and leaks prior to shipment. In this article we will discuss about simple vapour compression refrigeration system. Simple vapour compression refrigeration system with. Layout of the r22 vapour compression refrigeration system. It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator. Some basic refrigeration cycles are discussed here through different diagrams. In the vapor absorption process, the compression process of the vapor compression cycle is replaced by an absorber, a generator and a pump. Schematic of a basic vapor compression refrigeration system it can be seen that the condenser has to be capable of rejecting the combined heat inputs of the evaporator and the compressor. 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. Latent heat involved in phase change ensures high value of heat removal, while air refrigeration system has sensible heat only. Hvac and refrigeration system bureau of energy efficiency 73 figure 4.
This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Of course, it may be preferable to utilize heat as such as it avoids undergoing through. Pdf exergy analysis of vapour compression refrigeration system. In a vapour compression refrigeration system, refrigeration is obtained as the refrigerant evaporates at low temperatures. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. These all four components run a simple vapour compression refrigeration system. 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. Numerical simulation of vapour compression refrigeration. Find cop r and cop r, carnot for the same t max and t min, and the tons of refrigeration.
To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram. As shown in the figure the basic system consists of an evaporator, compressor, condenser and an expansion valve. For 30 years, topics such as air refrigeration cycles and systems, vapour compression refrigeration systems simple and compound, refrigerants incl. The vapour compression refrigeration system is by far the most popular and widely used system in refrigeration and air conditioning bot for industrial and domestic applications. Vapor compression refrigeration system basic, working. Vapour compression refrigeration system generating fresh water from humidity in the air conference paper pdf available january 2011 with 4,415 reads how we measure reads. Aug 30, 2019 vapour compression refrigeration cycle is the most widely used refrigeration system. Refrigerant4a is the working fluid in an ideal compression refrigeration cycle.
The regulations apply to vapour compression refrigeration systems incorporating compressor drive motors, including standby compressor motors, having a total installed power exceeding 25 kw. The standard vapor compression refrigeration system is a condenser, evaporator, throttling valve, and a compressor. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. The video explains the various devices used in vapour compression refrigeration system, their functions thus describing the various processes in vapor compression cycle. In this system, the working substance is a refrigerant like nh 3, r11, r12.
In this articles we discussed about difference between vapour compression and vapour absorption refrigeration system and pdf is available. Review of vapour absorption refrigeration and vapour. Vapour compression refrigeration cycle is the most widely used 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. Refrigeration and air conditioning pdf book agrimoon. The refrigeration effect is obtained in the cold region as heat is extracted by the vaporization of refrigerant in the evaporator. Classification of refrigeration system types of refrigeration.
Vapour compression cycle definite guide with video. Pdf in vapour compression refrigeration system, it generates fresh drinking water and also extracts water from humid ambient air by using. Jan 09, 2018 if you want to know how refrigeration system works you can get it in brief here. Refrigeration system an overview sciencedirect topics. 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. Pdf vapour compression refrigeration system generating fresh.
The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. Liquids absorb large amounts of heat when boiled off to a gas. Vapor absorption refrigeration cycle or vapor absorption refrigeration system vars pdf. Superheating and sub cooling process will influence the cooling capacity and compressor work. The compressor, condenser, throttle and evaporator are analyzed separately from each other. The water leaves the evaporator as a saturated vapour at 10 c. System description the layout of the system is shown in figure 1. Difference between vapour compression and vapour absorption. Advantages and disadvantages of air refrigeration system mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator, and heat pump. The vapor compression refrigeration cycle, step by step. The refrigerant leaves the evaporator at 20oc and has a condenser pressure of 0. Refrigerant r22 vapour enters a positive displacement compressor at a slightly. Ppt vapour compression cycle powerpoint presentation. Vapor absorption refrigeration cycle or vapor absorption refrigeration systemvars pdf.
Refrigerants for vapour compression refrigeration systems. Goals of lab to get acquainted with a vaporcompression refrigeration system to be able to use pressureenthalpy diagrams and tables. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The vapor compression refrigeration cycle is virtually rankine cycle with the. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere.
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. Compressors, psychrometry and applications of refrigeration and air conditioning have been included and updated for students to conceptualise the subject in a complete manner. Oil in circulation in an vapor compression refrigeration system is known to cause a reduction in heat transfer coefficient and increase in pressure drop in heat exchangers and connecting lines 1,2,3, as well as reducing the oil level inside the compressor crankcase. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved. Difference between vapour compression and vapour absorption pdf. In absorption refrigeration system, however, heat is directly utilized as source of energy.
A vapour compression refrigeration system comprises of four components. So refrigeration cycle should be known to understand the refrigeration system. The evaporator and condenser are fabricated as shell and tube type adiabatic. Vapour compression refrigeration system linkedin slideshare. Both a steadystate and a transient simulation will be considered. Purpose of refrigeration examples and applications choice of coolant and refrigerants phase diagram of water and co 2 vapor compression refrigeration system pressureenthalpy diagram for refrigerants refrigerator, air conditioner, thermoelectric cooler, heat pump designation, choice, criteria for selection, and. Refrigeration and air conditioner, rac, various absorption systems. The input to the system is in the form of mechanical energy required to run the compressor the actual vapour compression cycle is based on evansperkins cycle, which is also called as reverse rankine cycle. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Exergy analysis of vapour compression refrigeration system. 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. Vapor compression refrigeration system p, t, h, and phase changes in a vapor compression refrigeration cycle 2. Additionally, a pht chart with the refrigeration cycle will be plotted.
Ppt vapour compression cycle powerpoint presentation free. In domestic refrigerators, the most used cooling system is vapour compression, as it has a good value of cop. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. The figure shows the basic components of a vapor compression refrigeration system. The standard vapour compression refrigeration system section 10.
A textbook of refrigeration and air conditioning simple vapour. Simple vapour compression refrigeration system with diagram. Vapour compression refrigeration system refrigeration heat. The above figure shows the objectives of refrigerators and heat pumps. Performance analysis of vapour compression and vapour. Vapour compression refrigeration system refrigeration vapour. Pdf design and construction of a vapour compression. Cold inst a substance or an energy form, its the lack of heat. The power utilized in vapour compression system is high grade energy i.
This refrigeration system works under vapour compression cycle with the basic principle the liquid when evaporates. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which the refrigerant undergoes phase changes, is one of the many. Vapour absorption system vapour absorption system is an attractive method for utilizing low grade energy directly for cooling. The refrigerant absorbs heat from one place and releases it to another place.
70 124 364 941 1442 266 1551 861 1040 1117 1492 121 103 1000 1036 165 126 611 1333 112 1071 314 737 1215 872 227 522 991 1088 460 401 604