The concept of analytical study of vapour compression refrigeration system using matrix heatexchanger carried out to. Commonly used refrigerants are in the family of chlorinated fluorocarbons cfcs, also called freons. The montreal protocol of 1987 and the subsequent copenhagen agreement of 1992 mandate a reduction in the production of ozone. Vapor compression refrigeration cycle engineering essay. Theobjective of this research paper is to study the performance of a vapour compression refrigeration system with and without a matrix heat exchanger. Such systems are compound multistage systems, cascade systems and multi evaporator systems. Multistage vapour compression refrigeration system eco. A compressor which compresses the vaporous working fluid. For the love of physics walter lewin may 16, 2011 duration. Abstract refrigeration is the process of reducing and maintaining the temperature of a space or material below the temperature of surrounding. A compressor which compresses the vaporous working fluid and providing required mechanical energy, 9 6, to the system. Types of refrigerant used in vapour compression systems a variety of refrigerants are used in vapor compression systems. 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. Currently, the mechanical vapor compression systems used for this purpose, use large amounts of.
Vapourcompression units are the most widely used refrigeration systems. Twostage compression cycle with one evaporator and intercooling with flash gas 53. This paper deals with the evaluation of the performance of a refrigeration system by using different refrigerant mixtures. Layout of the r22 vapourcompression refrigeration system. Exergy analysis of vapour compression refrigeration system. It combines sorption thermal and conventional vapour compression. Typical vapor compression systems can be represented as shown in figure. The refrigeration capacity is 8 tr and the compression is. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. The refrigeration capacity is 8 tr and the compression is adiabatic reversible process. The refrigerants hfc152a, hfc32, hc290, hc1270, hc600a and re170 were used as the working fluid for the comparison with the conventional refrigerant r4a. 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.
Experimental analysis of a vapour compression refrigeration system by. Evaluation of vapour compression refrigeration system using. It is also used in domestic and commercial refrigerators, largescale. Design of two stage vapour compression refrigeration. Schematic of a vapour compression refrigeration cycle is shown in fig. These systems belong to the general class of vapor cycles, wherein the working refrigerant undergoes phase change at least during one process.
Vapour absorption refrigerator is a self contained refrigerator working on absorption technology. The system has a main parts like compressor, condenser receiver, refrigerant control device and evaporator. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. Vc cycle on ts diagram it is worth noting that two of the processes are at constant pressure and one is at constant enthalpy. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram. Sukamto et al 1 in his research report that the use of liquidsuction subcooler on cooling machine using the working fluid r22 can increase the coeffisients of performance cop to a variety of environmental temperature. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Feb 10, 2017 these systems belong to the general class of vapor cycles, wherein the working refrigerant undergoes phase change at least during one process.
A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. Introduction vapour compression refrigeration systems are commonly used in a variety of commercial and industrial applications due to their high cooling capacity at low temperature, but to run these systems, high. In this article we will discuss about simple vapour compression refrigeration system. Layout of the r22 vapour compression refrigeration system. It is also used in domestic and commercial refrigerators, largescale warehouses for.
In vapour compression refrigerating system, the work is supplied by the compressor. The refrigerants generally used for this purpose are ammonia nh3 carbon dioxideco2 and sulphur dioxideso2. Pdf the design and construction of a refrigerator as a test rig. All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. In the vapor compression refrigeration system the compr. In this paper, performance of the fabricated system is. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapourcompression refrigerators when employing refrigerant r11, r12, r22 or r502. Some basic refrigeration cycles are discussed here through different diagrams. Pdf design and construction of a vapour compression. Vapour compression refrigeration systems as specified, vapour compression refrigeration systems are the most ordinarily utilized among all refrigeration systems. The vapor compression cycle is a wellestablished refrigeration technique used in most household refrigerators, airconditioners, and many large commercial and industrial refrigeration systems. A refrigeration system allows transfer of heat from a cooling chamber to a location where the heat can be easily discarded.
In such cases multistage systems are used in practice. In cases where large temperature and pressure differences exist between the evaporator and the condenser, multistage vapourcompression systems work accordingly. The compression process increases the temperature of refrigerant from lower limit t2 to the upper limit tl. International journal of students research in technology. Combined vapour compressionejector refrigeration system. The vaporcompression cycle is a wellestablished refrigeration technique used in most household refrigerators, airconditioners, and many large commercial and industrial refrigeration systems. In the vapour absorption system, an absorber, a pump, a generator and a pressurereducing valve replace the compressor.
The compression process increases the temperature of. The performance of an absorption refrigeration system is required to. 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. Vapour compression cycle generally known as vcc is a refrigeration cycle. W hen the compressor is mounted on the system, a similar joining. Generally, for fluorocarbon and ammonia based refrigeration systems a single stage system us used up to oan evaporator temperature of 30 c. Prototype of hybrid refrigeration system using refrigerant r723. The summation of indirect and direct warming impact, namely, total equivalent warming impact tewi of the vapour compression cooling systems are significantly high. The evaporating temperature is 25 oc and condensing temperature 47 oc. In this system, the working substance is a refrigerant like nh 3, r11, r12. A performance comparison of vapour compression refrigeration. Another option is to combine a vapour injected compressor with a flash tank. Twostage compression cycle with one evaporator and intercooler with water 51. Mar 09, 2016 comparison of vapor absorption system with vapor compression system can be done in 9 aspects.
Recent developments in simulation techniques for vapour. The refrigerant as a mixture of liquid and vapour corresponding to state point 1 enters the compressor where isentropic compression takes place. Vapor compression refrigeration test rig at best price in. The effects of the main parameters of performance analysis such as refrigerant type. Highly compressed fluids tend to get colder when allowed to expand. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant.
Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. A centralized system figure 11 however, requires extensive facilitywide piping, with at least two pipes liquid supply, vapor return required. Introduction food conservation and the air conditioning of living spaces are indispensable for human beings in the modern life. Twostage compression cycle with one evaporator and intercoolerflash tank 55. 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. Evaluation of vapour compression refrigeration system. Therefore ph diagram is a convenient way of representing and calculating the vapour compression cycle. 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. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. Performance analysis of a vapour compressionabsorption.
Dec 01, 2016 page 4 of 4 theory of vapour compression refrigeration cycles carnot cycle this experiment uses a vapour compression refrigeration cycle which cools air down. Page 4 of 4 theory of vapour compression refrigeration cycles carnot cycle this experiment uses a vapour compression refrigeration cycle which cools air down. Basic vapour compression refrigeration cycle consists of four major thermal processes. The refrigerant absorbs heat from one place and releases it to another place. Abstract power consumption is a major concern in vapor compression cycle. For a hot gas defrost system, three or four additional pipes may be needed a distributed refrigeration system figure 12, usually on the roof, provides multiple racks placed close to specific loads. Vapor compression refrigeration system basic, working. Refrigeration system performance using liquidsuction heat. The ammonia blend r723 is the refrigerant for both subsystems. So refrigeration cycle should be known to understand the refrigeration system.
Improved vapour compression refrigeration cycles purdue epubs. As the name suggests, these systems have a place with the general class of vapour cycles, wherein the working liquid refrigerant experiences stage change at any rate amid one. Vapour compression heat pumps are refrigeration systems whose. Alternative refrigerants for vapour compression systems the use of cfcs is now beginning to be phased out due to their damaging impact on the protective tropospheric ozone layer around the earth. Malwe refrigerator, which is so common and runs continuously everywhere. Lecture 11 vapour compression refrigeration systems duration. Vapour compression cycle definite guide with video. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. Background stoecker and walukas 1981 focused on the influence of liquidsuction heat exchangers in both single temperature evaporator and dual temperature evaporator systems utilizing refrigerant mixtures. In the absence of a compressor or pump, the circulation takes place by density difference. 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. Refrigeration cycle is the basis of all refrigeration systems. International refrigeration and air conditioning conference at purdue, july 17 20, 2006.
The objective of this study is to design and simulate a vapor compression refrigeration cycle for a microscale refrigerator. One of the most important parts of any refrigeration cycle is the compression of the refrigerant since all the further operations depend on it. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapour compression refrigerators when employing refrigerant r11, r12, r22 or r502. However, mankind is facing serious problems concerning the global environment, and the emissions of conventional refrigerant fluids such as a. Discuss limitations of single stage vapour compression refrigeration systems. The system has a main parts like generator, rectifier, condenser absorber and evaporator. Lecture 10 vapour compression refrigeration systems youtube. Schematic of typical vapor compression refrigeration system with a liquidsuction heat exchanger. Introduction a vapour compression refrigeration system is an improvised type of air refrigeration system in which a suitable working substance termed as refrigerant is used. Multistage vapour compression refrigeration systems nagendra m cbm engineer, hindusthan zink. Vapor compression refrigeration systems are used for a variety of cooling refrigeration applications. Design of two stage vapour compression refrigeration system. In this lesson, one will learn how to solve the problems on vapour compression cycle.
These are the evaporator, condenser, compressor and the expansion valve. Jan 25, 2008 lecture 11 vapour compression refrigeration systems duration. Simple vapour compression refrigeration system with. Simultaneously the heat released to absorb the vapor is removed by air. Performance analysis of vapour compression refrigeration system. According to the requirement, vapour compression system is further modified for better performance and control. In practical applications, vapour compression refrigeration systems are the most commonly used refrigeration systems, and each system employs a compressor. The system is designed and tested for various operating conditions using hot water as heat source. A two stage system is used up to 60oc and threestage. 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.
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. Pdf experimental analysis of a vapour compression refrigeration. Vapor compression refrigeration test rig at best price in india. System description the layout of the system is shown in figure 1. Vapour compression units are the most widely used refrigeration systems. Though the air is heated and cooled in the air conditioning unit it is the refrigeration cycle using r12 refrigerant as the working fluid which is the main focus of the experiment.
The required cooling temperature largely determines the choice of fluid. Both a steadystate and a transient simulation will be considered. The transfer of heat is accomplished by using a refrigerant, which can change its state from liquid to gas. Discuss the concept of flash gas removal using flash tank. The vapour absorption refrigeration system is not so much used commercially because of its low performance. The test rig used for the experiment is a vapour compression refrigeration system designed to work with r4a and blend mixture of r600a and r290. Vapour compression refrigeration is the primary method to provide mechanical cooling. For example, if the temperature of the refrigerator i. This refrigeration system works under vapour compression cycle with the basic principle the liquid when evaporates. Vapour compression system vapour absorption system. However, unlike water the refrigerant has a much lower boiling point.