Since the vapor compression cycle is against the second law of thermodynamics, some work is necessary for the transfer to take place. So refrigeration cycle should be known to understand the refrigeration system. Vapor compression refrigeration system basic, working. Difference between vapour compression and vapour absorption pdf. The refrigerant used does not leave the system but is circulated throughout the system. However, unlike vapour compression refrigeration systems, the required input to absorption systems is in the form of heat. To study works principle of steam jet refrigeration system. The behavior of performance parameters of a simple vapour compression refrigeration system were studied while its working under transient conditions occurred during cooling of a fixed mass of brine from initial room temperature to subzero refrigeration temperature.
The above figure shows the objectives of refrigerators and heat pumps. 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. If you continue browsing the site, you agree to the use of cookies on this website. The coefficient of performance of a refrigeration system is. From there the vapour refrigerant flows through a tube to the inlet of the compressor 1 to close the cycle. Design of two stage vapour compression refrigeration system. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. Flownex was used to simulate a vapour compression refrigeration system using r22 as refrigerant. Thermodynamic analysis of the performance of a vapour. The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. 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.
May 10, 2017 learn about vapour compression refrigeration system. Simple vapour compression refrigeration system with. Vapourcompression refrigeration or vaporcompression refrigeration system, 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 above figure shows simple vapour compression refrigeration system.
Natural gas plants, petroleum refineries, and petrochemical plan. A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. Some basic refrigeration cycles are discussed here through different diagrams. The ideal vapour compression cycle is shown on the pressureenthalpy diagram of figure 1. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator.
Vapour absorption cycles are not used now a days and has been phased out towards the. Environmentally benign natural refrigerants have recently attracted a considerable. Figure below is a schematic of the components and flow arrangements for the vapor compression cycle. Vapour compression cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used. Vapor compression refrigeration systems are used for a variety of cooling refrigeration applications. Pdf thermodynamic analysis of performance of vapour. Pdf vapour compression refrigeration system generating fresh. Refrigeration cycle is the basis of all refrigeration systems. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Heat rejection from the lower cycle to the upper cycle takes place in an.
The vapor compression refrigeration cycle, step by step araner. 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. 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. The work is supplied to the system from the surroundings. 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. Vapour absorption refrigeration system with diagram. Simple vapour compression refrigeration system departmen of mechanical engineerin lecture16 simple vapour compression refrigeration system a vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. This is a pdf on the basic vapour compression cycle. The low pressure saturated vapour refrigerant from evaporator drawn into the compressor through suction valve. A vapour compression refrigeration system is the most widely used. Vapour compression cycle definite guide with video. Vapour compression cycle generally known as vcc is a refrigeration cycle.
Vapour compression systems have mainly four elements in the refrigeration system i. Ppt vapour compression cycle powerpoint presentation free. Evaluation of vapour compression refrigeration system using. It uses circulating liquid refrigerant as a medium, which absorbs and removes heat from the refrigerating chamber and subsequently rejects that heat at the condenser. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Vapor compression refrigeration systems are used for a variety of coolingrefrigeration applications. Layout of the r22 vapour compression refrigeration system. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats, refrigerated trucks and railroad cars, and a host of other commercial and industrial services. It condenses and evaporates at temperatures and pressures close to the atmospheric conditions. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram.
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. Mechanism and working of a vapour compression refrigeration. The refrigerant then compressed to high pressure by the compressor and then delivered to the condenser through the delivery valve. Alternatively, a refrigeration system can be used for providing cooling in summer and heating in winter. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a direction contrary to gross environmental. Hfc 4a is the mostly widely used alternative refrigerant in refrigeration equipment such as domestic refrigerators and air conditioners.
Performance analysis of a refrigeration system using nano. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of rankine cycle is replaced by. 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. Both a steadystate and a transient simulation will be considered. Vapour compression refrigeration system refrigeration heat. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Refrigeration and air conditioning systems onboard ships. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a. Thermodynamic analysis of performance of vapour compression refrigeration system working with r290 and r600a mixtures august 20 scientia iranica 206. Apr 02, 2016 vapour compression refrigeration system 1. Vapour compression refrigeration system the vapour compression refrigeration system is widely used in commercial and domestic refrigeration and air conditioning plants. In a vapour compression refrigeration system the nanoparticles can be added to the lubricant.
The standard vapor compression refrigeration system is a condenser, evaporator, throttling valve, and a compressor. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Twophase liquidvapor mixture vapour compression refrigeration system vapour compression refrigeration systems are the most commonly used among all refrigeration systems. The absorption systems have experienced many ups and downs. The construction of vapour compression refrigeration system is illustrated in figure 1. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved.
Vapor absorption refrigeration cycle or vapor absorption refrigeration system vars pdf. Vapour absorption refrigeration system working,diagram introduction vapour absorption refrigeration systems vars belong to the class of vapour cycles similar to vapour compression refrigeration systems. Vapor compression refrigeration an overview sciencedirect. Each stage operates on an ideal vapor compression refrigeration cycle with refrigerant4a as the working fluid. Components of vapour compression refrigeration cycle compressor the low pressure saturated vapour refrigerant from evaporator drawn into the compressor through suction valve. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of. Refrigeration onboard ships marine engineering study. These systems belong to the general class of vapour cycles, wherein the working fluid refrigerant undergoes phase change at least during one process. Performance analysis of vapour compression and vapour.
The schematic sketch of doubleeffect system is shown in fig. British thermal unit and is equivalent to 778 ftlbf of work 1 w 3. Hence these systems are also called as heat operated or thermal. The highpressure refrigerant flows through a condenser heat. Magnetic refrigeration systems vapour compression systems are used onboard because of its high efficency and coefficient of perfomance compared to vapour absorption systems. First a steadystate simulation was done and the results of this simulation were used as initial conditions for a transient simulation. Hrnjak, in 8th international conference on compressors and their systems, 20. Vapor compression refrigeration system basic, working, parts of. The refrigerant absorbs heat from one place and releases it to another place. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Vocabulary background in the thermodynamics and refrigeration literature, several words are used interchangeably that can cause confusion. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. It condensed and evaporates at temperatures and pressures close to the atmospheric conditions.
Vapour compression cycle free download as powerpoint presentation. Vapour compression refrigeration system refrigeration. The vapor compression refrigeration cycle is a common method for transferring. It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator. 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. Vapour compression refrigeration system free download as powerpoint presentation. In vapour compression refrigerating system, the work is supplied by the compressor. Vapour absorption refrigeration system working,diagram.
A textbook of refrigeration and air conditioning simple vapour. In this article we will discuss about simple vapour compression refrigeration system. Refrigeration onboard ships marine engineering study materials. Pdf in vapour compression refrigeration system, it generates fresh. System description the layout of the system is shown in figure 1. Consider a twostage cascade refrigeration system operating between the pressure limits of 0. Learn about vapour compression refrigeration system. The component of the modern day refrigeration system wh. In the vapor absorption process, the compression process of the vapor compression cycle is replaced by an absorber, a generator and a pump. A simple and practical absorption system using ammonia as refrigerant and water as absorbent described in the previous articles is an example of singleeffect cycle system for vapour absorption refrigeration system. Layout of the r22 vapourcompression refrigeration system. The vapor compression refrigeration cycle involves four components. Pdf vapour compression refrigeration system generating. Nov 15, 2016 vapor compression refrigeration system,vapor compression refrigeration cycle,vcrs cycle,vcrs system,vcrs lecture, vcrs working, vcrs nptel,vcrs cycle explained,vcrs system explained,vcrs lecture.
Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. 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. It is also used in domestic and commercial refrigerators, largescale. 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. Pdf design and construction of a vapour compression. The presentation will give you idea about the vapor compression refrigeration system. The temperature at which a fluid boils or condenses is known as. Ppt vapour compression cycle powerpoint presentation.
Evaluation of vapour compression refrigeration system. Vapour compression cycle refrigeration atmospheric. Components of vapour compression refrigeration cycle. The vapor compression refrigeration cycle, step by step. The working fluid called refrigerant completes its. A refrigeration system can also be used as a heat pump, in which the useful output is the high temperature heat rejected at the condenser. In this type of refrigerator, refrigerant undergoes phase changes. In this system, the working substance is a refrigerant like nh 3, r11, r12.
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. Simple vapour compression refrigeration system with diagram. Refrigerants are working substances or heat carrying medium in refrigeration system, during a refrigeration cycle heat is absorbed from a low temperature system. Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2. Cabello et al 11 studied the influence of the evaporating pressure, condensing pressure and superheating degree of the vapour on the exergetic performance of a refrigeration plant using three different working fluids r4a, r407c, r22. Design of two stage vapour compression refrigeration. The principle of the system is to make use of two substances that can be separated when heated. 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. These all four components run a simple vapour compression refrigeration system. Venkataramanamurthy and senthil 2010 conducted an experimental test for the analysis the comparisons of energy, exergy flow and second law efficiency of r22 and its substitutes r436b in vapour compression refrigeration system. First, evaporation is simply the process of vaporization these two terms are essentially synonymous.
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