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. Work is required to transfer heat from lower temperature body to higher temperature body. Ppt vapour compression cycle powerpoint presentation, free. Comparison of vapor absorption system with vapor compression system can be done in 9 aspects. Both a steadystate and a transient simulation will be considered. Vars is also belongs to class of vapor cycle is similar to the vcrs. Ppt refrigeration systems powerpoint presentation free to. May 10, 2017 learn about vapour compression refrigeration 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. In these slides i have discussed about vapour compression system. Discuss limitations of single stage vapour compression refrigeration systems. The evaporating temperature is 25 oc and condensing temperature 47 oc. Natural gas plants, petroleum refineries, and petrochemical plan. Vapor compression distillation fresh water generator.
Multistage vapor compression refrigeration cycle the saturated vapor in stream 6 recycled back into the upper cycle, has a high enthalpy. Refrigeration system design and analysis 1 refrigeration system design and analysis. Based upon the condensation process of working fluid, there are two types of chiller. A free powerpoint ppt presentation displayed as a flash slide show on id. The refrigeration capacity is 8 tr and the compression is adiabatic reversible process. Classification natural refrigerators mechanical refrigerators gas refrigerators vapour refrigerators vapour compression. The working fluid refrigerant used in this refrigeration system readily evaporates condenses or changes alternatively between the vapour liquid phases. 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. The presentation will give you idea about the vapor compression refrigeration system. Download ppt vapour compression cycle you will learn. 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.
If you continue browsing the site, you agree to the use of cookies on this website. Analysis of a vapor compression refrigeration cycle. Less components like compressor, condenser, expansion valve, and. Absorption of refrigerant vapour by a suitable absorbent or adsorbent. Refrigeration refrigeration refrigeration a process where heat is transferred from a lowerto a higher temperature level by doing work on a system. Apr 02, 2016 vapour compression refrigeration system 1. Vapour compression refrigeration system slideshare. Energy management handbook sixth edition, chapter 8. Introduction a single stage vapour compression refrigeration system has one low side pressure evaporator pressure and one high side pressure condenser pressure. These systems were applied successfully to refrigeration in the early years of this century. It is self sustaining and requires very less energy to produce water. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail. Ppt refrigeration systems powerpoint presentation free. Introduction the vapour absorption refrigeration system is one of the method of producing refrigerating effect.
Mechanical engineering refrigeration and air conditioning nptel. Typical vapor compression systems can be represented as shown in figure. Refrigeration system refrigeration refrigerator free. These type of generators are used where heating source is not available. View and download powerpoint presentations on vapor compression refrigeration cycle ppt. The majority of modern plants use the multistage flash thermal process msf or the thermal vapour compression system multieffect desalination tvcmed. 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. In the illustration of the models of throttling devices, only those for capillary tubes are given because capillary tubes are used widely.
The vapour compression cycle is used in most of the modern refrigeration systems in large industrial plants. Figure 1 depicts a typical, singlestage vapor compression system. The above figure shows the objectives of refrigerators and heat pumps. Multistage vapour compression refrigeration systems nagendra m cbm engineer, hindusthan zink. Moving parts are in compressor makes more noise, wear and tear. The performance of single stage systems shows that these systems are adequate as long as.
The most frequently used refrigeration cycle is the vapor compression refrigeration cycle in which the refrigerant is vaporized and condensed alternately and is compressed in the vapor phase. Comparison of vapor absorption system with vapor compression. At low temperatures the saturation pressures are low 0. This explains the operation and working principle of a vapor compression distillation type fresh water generator. Introduction the vapour absorption refrigeration system is one of the oldest methods of producing refrigerating effect the principle of vapour absorption was first discovered by michael faraday in 1824 the first vapour absorption refrigeration machine was developed by french scientist, ferdinard carre, in 1860. Chilled water is produced based on the principle that. Development of the vapour compression system in mid 19th century. Vapor compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Vapor compression refrigeration cycle ppt xpowerpoint. Vapour compression refrigeration systems ppt video online.
All vapor compression systems consist of the following four basic components alongwith the interconnecting piping. In the vapour absorption system the compressor is replaced by an absorber,a pump,a generator,and a pressure reducing valve. Vapour absorption system vapour absorption system is an attractive method for utilizing low grade energy directly for cooling. The refrigerated hold was insulated using powdered charcoal. This is the most important system from the point of commercial domestic utility most practical form of refrigeration.
William baratuci senior lecturer chemical engineering department university of washington a free powerpoint ppt presentation displayed as a flash slide show on id. For instance, the cop of the two stage lithium bromide system is about 1. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Vapour compression refrigeration is the primary method to provide mechanical cooling. A small refrigerator operating on the absorption principle with parabolic concentrator collector built. Vapour absorption refrigeration system authorstream. Refrigeration system vapoor compression cycle ppt presentation summary. Vapour compression cycle energy management handbook sixth edition, chapter 8 refrigerator air conditioning plant heat pump refrigerator electricmotordriven. Discuss the use of flash tank for flash gas removal only. Vapor compression vc systems are well established in the automotive industry and hvac, but are still emerging in thermal management of electronics. Introduction a single stage vapour compression refrigeration system has one low side. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. At point 1, let t 1, p 1 and s 1 be the temperature, pressure and entropy of the vapour refrigerant.
Vapor compression refrigeration cycle versus absorption. Steam jet refrigeration system seminar report download. Review of vapour absorption refrigeration and vapour. Vapor compression refrigeration transports large quantities of heat with a small mass of circulating fluid. This is because the compression ratio is too high to reach the temperatures necessary for evaporates and condenses the steam. The investigations present the effects of the evaporating temperatures on the exergy flow losses and second law efficiency and coefficient of performance of a vapour compression refrigeration cycle.
By diverting this high enthalpy stream from the lower cycle into the upper cycle, we have accomplished the same energy transfer that the heat exchanger accomplishes in a cascade cycle. Ppt cheme 260 vaporcompression refrigeration cycles. Thermal vapour compression an overview sciencedirect topics. Ueeneej103a establish the basic operating conditions of. The system maintained at the lower temperature is known as refrigerated system while equipment used to maintain this lower temperature is known as refrigerating equipment. Ppt vapour compression cycle powerpoint presentation free. Recent developments in simulation techniques for vapour. Vapor compression refrigeration system basic, working. Vapor compression cooling for high performance applications. Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2. Flownex was used to simulate a vapour compression refrigeration system using r22 as refrigerant. Ppt vapour compression cycle powerpoint presentation free to download id. Vapour compression refrigeration system linkedin slideshare. Assuming the compression process to be isentropic find.
In this system, on the evaporator installed within the refrigeration system and ice structural unit, as a source of low temperature, it absorbs the heat. In the past, this was done by collecting ice in the winter and using its specific heat to cool as the ice melted. The cycle depicted in figure 1 offers several advantages for electronic cooling applications. Chinnappa 1961 investigated intermittent solar refrigeration system theoretical with absorption cycle for ammoniawater and ammonialithium nitrate combinations and compared the results with experimentally. Mar 09, 2016 comparison of vapor absorption system with vapor compression system can be done in 9 aspects. At the bottom of the articles you can download pdf. While the employment of natural refrigerants continues to this day, the development of. The refrigeration system used was a direct air expansion unit powered by steam from the ships boiler. Multistage vapour compression refrigeration systems 1. Mechanical vapour compression med mvcmed units are less common. It is also used in domestic and commercial refrigerators, largescale warehouses for.
This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. The steam generated due to evaporation of seawater is used as heating source to generate more steam. The vapor compression refrigeration cycle, step by step. Difference between vapour compression and vapour absorption pdf. 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.
Low freezing point by which we can maintain the low evaporator temperature. Vapour absorption refrigeration system linkedin slideshare. The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. Discuss the use of flash tank for inter cooling only. The coefficient of performance of the absorption refrigeration systems is very low compared to the vapor compression systems. 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. Learn about vapour compression refrigeration system. Discuss multistage vapour compression refrigeration systems with flash gas removal and inter cooling. Multistage system of cooling is widely used there, where ultralow temperatures are required, but can not be produced economically through the use of a singlestage system. A free powerpoint ppt presentation displayed as a flash slide show on.
It is also used in domestic and commercial refrigerators, largescale. These are the evaporator, condenser, compressor and the expansion valve. Learning outcome demonstrate understanding of basic vapor compression refrigeration and heat pump systems. Vapor compression systems can reject heat far from the source by separating the evaporator and condenser in a socalled split system. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of rankine cycle is replaced by. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that. The primary aim of the present work is to design an airconditioning system based on vapour absorption cycle that utilizes a renewable energy source for its operation. Compression refrigeration system evaporator extract heat from the productair and use it as the latent heat of vaporization of the refrigerant compressor raise temperature of refrigerant to well above that of surroundings to facilitate transfer of energy to surroundings in condenser condenser.
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. Develop and analyze thermodynamic models of vapor compression systems and their modifications, including sketching schematic and accompanying ts diagrams. Powerpoint presentation on vapor absorption refrigeration system. Ppt vapour compression cycle powerpoint presentation. Vapour compression refrigeration systems presentation transcript. The vapour compression refrigeration and vapour absorption refrigeration systems were developed around 1870. Discuss the concept of flash gas removal using flash tank. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Find powerpoint presentations and slides using the power of, find free presentations research about vapor compression refrigeration cycle ppt. Before moving further on differences lets have an overview of both the vapour compression and vapour absorption refrigeration system. An important characteristic of absorption system of refrigeration is a noisy operation b quiet operation c cooling below 0c d very little power consumption e its input only in the form of heating. Vapour compression refrigeration system refrigeration.
Bilal and syed 2011 investigated performance degradation due to fouling in a vapour. Working fluid for vapor absorption refrigeration system vars properties of working fluid refrigerant absorbent system. Apr 18, 2014 assuming the compression process to be isentropic find. 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. Vars usually comes in higher capacitiesmore than 50 tr until now but china has invented lesser capacity vars machines2 tr, so it founds its applications in. Another wellknown refrigeration cycle is the gas refrigeration cycle in which the refrigerant remains in the gaseous phase throughout 3. Steam jet refrigeration system seminar report download introduction in steam jet refrigeration systems, water can be used as the refrigerant. Vapour absorption refrigeration system departmen of mechanical engineerin figure 1. Analysis of a vapor compression refrigeration cycle application. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. This application analyzes the following refrigeration cycle, and calculates the coefficient of performance. When 1 pound of ice melts, it absorbs 144 btu, as latent energy.
63 1051 227 474 143 1313 957 309 1364 716 632 759 1231 941 1247 1433 1272 228 756 1324 1360 1055 1125 1134 578 418 1363 54 616 457 513 1308 487 1196 911