Actual vapour compression cycle watch more videos at. Mechanism and working of a vapour compression refrigeration system with pv and ts diagram. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. Woodruff school of mechanical engineering georgia institute of technology august 2007. Before moving further on differences lets have an overview of both the vapour compression and vapour absorption refrigeration system. Mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator. Vapour compression cycle definite guide with video. A computerized simulation of a simple singlestage vapour compression refrigeration system has been made. So refrigeration cycle should be known to understand the refrigeration system. System description the layout of the system is shown in figure 1.
The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Both a steadystate and a transient simulation will be considered. Today we will study the difference between vapour compression and. Vapor compression refrigeration system basic, working. Capacity range covers single effect from 100 to and double effect units from m3day to more than 2000 m3day.
Mahto department of mechanical engineering, bit mesra abstract there are two types of energy i. Refrigeration cycle animation vapor compression cycle. It is also used in domestic and commercial refrigerators, largescale. Pdf simulation of a simple vapourcompression refrigeration. We have seen various types of absorption refrigeration systems like simple absorption cycle, ammoniawater absorption cycle and also the vapor compression refrigeration cycle. First let us see the advantages of absorption refrigeration system and then we shall see the disadvantages of absorption refrigeration. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction.
Pdf a computerized simulation of a simple singlestage vapourcompression refrigeration system has been made. The actual vapour compression cycle differs from the theoretical vapour compression cycle in many ways, some of which are unavoidable and cause losses. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. Review on simple vapour compression refrigeration system. Advantages and disadvantages of vapor compression refrigeration cycle over air refrigeration system. The main deviations between the theoretical cycle and actual cycle are as follows.
You can see that in this process heat transfer takes place during process four to. Advantages and disadvantages of vapor compression refrigeration cycle over air refrigeration system mecholic no comments. The steadystate simulation uses the accurate property correlations developed by cleland. Vapor compression cooling for high performance applications. Vapour compression refrigeration system vapour compression refrigeration system is the most commonly used among all refrigeration systems.
A simple vapor compressor refrigeration system as shown in the fig. Performance characteristics of vapour compression refrigeration system under real transient conditions j. Lee et al 2006, present a combination of vapor compression cycle and natural refrigerant circulation for outdoor telecommunication equipment, with 2000 w cooling capacity. Vapour cycles can be subdivided into vapour compression systems, vapour absorption. Course content a vapor absorption chiller machine vam is a machine that produces chilled water using a heat source rather than electrical input as in the more familiar vapor compression cycle. Let us see the comparison of the vapor absorption cycle and vapor compression cycle. Miniature vapor compression system semantic scholar. Analysis of vapour compression refrigeration system. The vapour refrigerant leaving the evaporator is in superheated state. The dryness fraction at points 1 and 2 may be obtained by equating entropies at points 1 and 2. The vapor compression cycle explained is the most common type of system used in. Schematic of a vapour compression refrigeration cycle is shown in fig. So this is the cycle of a simple carnot vapour compression refrigeration system. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail.
View and download powerpoint presentations on vapor compression refrigeration cycle ppt. When simple vapour compression cycle is displayed on the temperatureentropy diagram fig. Vapor compression system an overview sciencedirect topics. Cycle with dry saturated vapour after compression 2. Single and multiplestage cascaded vapor compression refrigeration for electronics cooling a thesis presented to the academic faculty by charles lee coggins in partial fulfillment of the requirements for the degree master of science in the george w. Vapour compression cycle generally known as vcc is a refrigeration cycle. 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.
A textbook of refrigeration and air conditioning simple vapour. The thermodynamic efficiency is derived from the application of the heat pump principle by a large volumetric flow compressor acting as the heat pump. In simple commercial refrigeration systems the compressor is normally. Simulation analysis of compression refrigeration cycle. The interesting aspect is that according to indoor and outdoor temperatures the system can operate most of the time on a natural refrigerant. 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. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Simply stated, refrigeration systems efficiently move heat from a cold source to a hot heat. The mechanical vapor compression mvc distillation is inherently the most thermodynamically efficient process of singlepurpose thermal desalination plants. P coefficient of performance and vapour absorption has low c. Layout of the r22 vapourcompression refrigeration system. The main differences between vapour compression and vapour absorption refrigeration system are vapor compression has high c.
Tleimat encyclopedia of life support systemseolss evaporator, a condenser, a compressor, and an expansion valve where refrigerants such as freon or ammonia are used as working fluid in a closed cycle. In the compression process the energy used to compress the vapour turns into heat and increases its temperature and. The refrigeration system were also used for providing cooling and humidification for. Compression cycle an overview sciencedirect topics. A standard vapour compression cycle consists of four processes viz. Review of vapour absorption refrigeration and vapour. It seems unreasonable that cooling can be achieved with heat. The standard vapour compression refrigeration system section 10. The working fluid is a refrigerant that suits the high and low temperature reservoirs temperatures. Actual fig 1 the ph diagram of an ideal and an actual refrigeration cycle vol. Irreversibility within the evaporator, condenser and compressor are ignored no frictional pressure drops refrigerant flows at constant pressure through the two heat exchangers evaporator and condenser heat losses to the surroundings are ignored compression process is. Vapor compression refrigeration transports large quantities of heat with a small mass of circulating fluid. Waste heat utilization of vapour compression cycle s. Adiabatic compression process continues beyond the point where the condensing temperature is reached.
Exergy analysis of vapour compression refrigeration system article pdf available in international journal of applied engineering research 412. Vaporcompression cycle refrigeration cycle vaporcompression cycle thermodynamic cycle of heat pumps. Vapour compression systems are used for refrigeration and air conditioning. 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. Abstractin present, a vapor compression refrigeration cycle is frequently used. Pdf exergy analysis of vapour compression refrigeration system. Vapor compression using electrically driven compressors has become the dominant hvac technology due to its scalability, reliability, nontoxic and nonfiammable refrig erants, use of electricity, and relatively compact size. At the bottom of the articles you can download pdf. Ppt vapour compression cycle powerpoint presentation. Work is supplied to the system and after compression, the vapour is wet or saturated but.
A vapour compression cycle with wet vapour after compression is shown on ts and ph diagrams below. Vaporcompression cycle refrigeration is a process that uses the physics of phase change heat transfer and the unique properties of a refrigerant to transfer heat from a relatively cold source to a hot medium. How vaporcompression cooling works electronics cooling. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere.
The compression cycle is given this name because it is the compression of the refrigerant by the compressor which permits transfer of heat energy. Simple compression refrigeration is similar to reversed carnot cycle and. The refrigeration system were also used for providing cooling and humidification for summer comfort air conditioning 3. Note that there are different vapour compression cycles. Mechanism of simple vcrs assumptions for ideal vaporcompression cycle are. Mechanism of simple vapor compression refrigeration system different vapor. A compressor which compresses the vaporous working fluid. Exergy analysis of vapour compression refrigeration system. 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. Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. Vapor compression refrigeration cycle engineering essay. Vapor compression refrigeration cycle ppt xpowerpoint. The evaporation process or vaporisation of refrigerant is a constant pressure process and therefore it is represented by a horizontal line. Reverse carnot cycle air refrigertation system duration.
The cycle depicted in figure 1 offers several advantages for electronic cooling applications. A refrigeration cycle explained involves the cooling system process of refrigerators and air conditioners. It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings. Power reduction in vapour compression cooling cycles by power. Mechanical vapor compression distillation of saline water is a process in which mechanical energy is used as the main driving force.
Analysis of vapour compression refrigeration cycle tce. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. The simple vapour compression refrigeration cycle is shown in fig. In a vapor compression distillation of saline water, the system is not a closed cycle and. Review of vapour absorption refrigeration and vapour compression refrigeration system. Simulation of a vapourcompression refrigeration cycles. At point 1, let t 1, p 1 and s 1 be the temperature, pressure and entropy of the vapour refrigerant. Heat transfer rate at evaporator or refrigeration capacity is given by. Find powerpoint presentations and slides using the power of, find free presentations research about vapor compression refrigeration cycle ppt. In this compression refrigeration system system, the working fluid is mentioned in the state of liquid and vapour. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which. Simple vapour compression refrigeration system slideshare. Majority of the processes require high grade energy which is. Vapor compression systems can reject heat far from the source by separating the evaporator and condenser in a socalled split system.
Water and wastewater treatment technologies mechanical vapor compression distillation b. Refrigerants for vapour compression refrigeration systems. Theoretical backgound vapour compression heat pumps are refrigeration systems whose operational cycle is based on the reversed rankine. Page 5 of practical vapour compression refrigeration cycle in practice the reverse carnot cycle is adjusted to the vapour compression refrigeration cycle shown below in figure 3. Vapor compression refrigeration cycle versus absorption. The refrigerant absorbs heat from one place and releases it to another place. 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.
The simple vapour compression cycle is superimposed on the ph diagram in fig. The vaporcompression uses a circulating liquid refrigerant as the medium usually r4a which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. The process vapour compression is a distillation process, where evaporation of sea or brackish water is obtained by the application of. In this cycle, the enthalpy at point 2 is found out with the help of dryness fraction at this point. Some basic refrigeration cycles are discussed here through different diagrams.
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