Case1 the basics of refrigeration cycle ph diagram analysis. Difference between vapour compression and vapour absorption. Pdf vapour compression refrigeration system generating. The evaporating temperature is 25 oc and condensing temperature 47 oc. 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. The points which are required for engineering calculation are from h 1 to h 6 as shown in the figure 16. The prospects of alternatives to vapor compression. Vapour compression refrigeration is the primary method to provide mechanical cooling. Pdf in vapour compression refrigeration system, it generates fresh drinking water and also extracts water from humid ambient air by using. The vapour compression refrigeration and vapour absorption refrigeration systems were developed around 1870. Pdf vapour compression refrigeration system generating fresh. Generally refrigeration systems can be classified in 3 main cycle systems which are vapor compression refrigeration system, vapor absorption refrigeration system. 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. 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.
This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Refrigeration and air conditioning multiple choice questions. To improve the coefficient of performance cop, it is require decreasing the compressor work and increasing the refrigerating effect. Lee et al 2006, present a combination of vapor compression cycle and natural refrigerant. Methods for improving thermodynamic performances of. In this system, the working substance is a refrigerant like nh 3, r11, r12. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1.
In vapour compression refrigeration cycle an exery analysis of vapour compression refrigeration system 2507 exergy analysis can be used to identify which. Refrigeration and air conditioning objective questions and answers pdf. Typical vapor compression systems can be represented as shown in figure. Pdf a performance comparison of vapour compression.
Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. Vapor compression refrigeration system basic, working, parts of system introduction. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. Vapour absorption refrigeration system with diagram. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. Vapor compression refrigeration system basic, working. Schematic for ideal vapor compression refrigeration cycle. The vapor compression refrigeration is the most widely used cycle for refrigerators, airconditioners, and heat pumps. Goals of lab to get acquainted with a vapor compression refrigeration system to be able to use pressureenthalpy diagrams and tables.
Pdf design and construction of a vapour compression. In this articles we discussed about difference between vapour compression and vapour absorption refrigeration system and pdf is available. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration. Vapor compression refrigeration system p, t, h, and phase changes in a vapor compression refrigeration cycle 2. The refrigeration capacity is 8 tr and the compression is adiabatic reversible process. Refrigeration and air conditioning systems onboard ships.
Pdf exergy analysis of vapour compression refrigeration system. Vapour compression cycle generally known as vcc is a refrigeration cycle in this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. Ts diagram of vapour compression cycle compression process 41. Design and construction of a vapour compression refrigeration system as test rig to investigate the performance of liquefied petroleum. 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. The results of the assessment are summarized in table 1. Review of vapour absorption refrigeration and vapour.
Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. Compressor basic refrigeration cycle evaporator condenser receiver expansion. A refrigeration cycle explained involves the cooling system process of refrigerators and air conditioners. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a microscale refrigerator. Advantages and disadvantages of air refrigeration system mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator, and heat pump. For 30 years, topics such as air refrigeration cycles and systems, vapour compression refrigeration systems simple and compound, refrigerants incl. Experimental analysis on vapour compression refrigeration vcr system with r4a tetra fluro ethane refrigerant.
Vapour compression, refrigeration system, the system is composed by two refrigeration cycles working with r4a. A slight performance improvement in the components of a vapor. The basic components of any refrigeration system working on the vapour compression cycle, are the compressor, condenser, expansion valve, evaporator and the refrigerant fluid which is alternatively vapourized and liquefied during the refrigeration cycle. Superheating and sub cooling process will influence the cooling capacity and compressor work. The ts diagram for a vapor compression refrigeration cycle is shown below with the explanation of each stage. Pdf on oct 1, 2012, baskaran ayyalusamy and others published a performance comparison of vapour compression refrigeration system. H 1 to h 2 is the adiabatic compression of the compressor for the simple refrigeration system. Refrigeration cycle animation vapor compression cycle. It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings. It is also used in domestic and commercial refrigerators, largescale warehouses. Refrigerant r22 vapour enters a positive displacement compressor at a slightly.
Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Vapour compression refrigeration system generating fresh water from humidity in the air conference paper pdf available january 2011 with 4,091 reads how we measure reads. Miniature vapor compression system semantic scholar. This refrigeration system works under vapour compression cycle with the basic principle the liquid when evaporates. Simple vapour compression refrigeration system with. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. By araner posted 20180223 in refrigeration the vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. 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.
The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. The vapor compression refrigeration cycle, step by step. These are the evaporator, condenser, compressor and the expansion valve. Design and construction of a vapour compression refrigeration system as test rig to investigate the performance of liquefied petroleum gas lpg as refrigerant. Pdf textbook of refrigeration and airconditioning by r.
System description the layout of the system is shown in figure 1. 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. The above figure shows the objectives of refrigerators and heat pumps. The vapor compression refrigeration system is the most widely used refrigeration system today for air conditioning of large public buildings, private residences, hotels, hospitals, theaters, restaurants, and a host of other services. 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. 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. The low temperature, low pressure vapour at state b is compressed by the compressor. Vapour compression refrigera tion system, refrigerant, ozone depletion, global warming, cfc. One of the common refrigeration systems in use today is the vapor compression cycle. In this lesson, one will learn how to solve the problems on vapour compression cycle. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or.
Layout of the r22 vapourcompression refrigeration system. All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. A textbook of refrigeration and air conditioning simple vapour. This paper deals with the evaluation of the performance of a refrigeration system by using different refrigerant mixtures. Refrigeration and air conditioning systems onboard ships vapour compression systems moving heat from a lower temperature to higher temperature requires work to be done, according to second law of thermodynamics and this work can be done in many ways in different systems. The vapor compression cycle explained is the most common type of system used in refrigeration and air conditioning. Latent heat involved in phase change ensures high value of heat removal, while air refrigeration system has sensible heat only. Five alternatives to vapor compression technology were qualitatively evaluated to determine their prospects for being better than vapor compression for space cooling and food refrigeration applications. Refrigerants for vapour compression refrigeration systems. Figure 2 depicts the ts diagram of vapour compression cycle, the refrigerant is compressed by using a compressor and the pressure is. Schematic of a vapour compression refrigeration cycle is shown in fig. Compressors, psychrometry and applications of refrigeration and air conditioning have been included and updated for students to conceptualise the subject in a complete manner.
The vapor compression refrigeration cycle involves four components. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods. Refrigeration onboard ships marine engineering study. Refrigerant r22 vapour enters a positive displacement compressor at a slightly superheated state 1 and is then compressed to state. It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator. Obviously it is not possible in the natural manner because heat.
The schematic diagram of the arrangement is shown in fig. The low pressure and temperature vapour refrigerant from evaporator is drawn into the compressor through the inlet or suction valve a, where it is compressed to a. Based on these analyses, we developed estimates for unit energy savings over baseline vapor compression systems and identified relevant markets for each technology option e. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a direction contrary to gross. Compressor refrigeration system components evaporator condenser receiver expansion device. Vapour absorption system vapour absorption system is an attractive method for utilizing low grade energy directly for cooling. Modeling and investigation of refrigeration system performance with twophase fluid injection in a scroll compressor rui gu marquette university, 2016 vapor compression cycles are widely used in heating, refrigerating and airconditioning. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. Vapor compression refrigeration systems are used for a variety of cooling refrigeration applications. The standard vapour compression refrigeration system section 10. 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. Vapour compression cycle definite guide with video.
1067 232 956 372 93 963 681 1197 1370 425 1292 221 362 108 44 1272 1531 1066 1525 114 1225 1250 1131 1303 384 329 1360 1437 782 1428 189 496 599