Other systems employed are gas refrigeration, vapor. 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. Hrnjak, in 8th international conference on compressors and their systems, 20. The basic difference between vapour compression and vapour absorption cycles will thus be to replace the compressor of the vapour compression cycle by a set of equipment which fulfils the objective discussed above. Vapor compression refrigeration systems are used for a variety of coolingrefrigeration applications. Design a refrigeration system the engineering mindset. The refrigerant absorbs heat from one place and releases it to another place. The typical vaporcompression system consist of four components. Vapour compression cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used. In the vapor compression refrigeration system, which is widely used, the external agent is a compressor. The refrigerant leaves the evaporator at 20oc and has a condenser pressure of 0. The vapor compression refrigeration cycle, step by step.
Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. Additionally, a pht chart with the refrigeration cycle will be plotted. The above figure shows simple vapour compression refrigeration system. Bilal and syed 2011 investigated performance degradation due to fouling in a vapour. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a direction contrary to gross environmental. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram. For 30 years, topics such as air refrigeration cycles and systems, vapour compression refrigeration systems simple and compound, refrigerants incl. Today we will study the difference between vapour compression and vapour absorption refrigeration system in detail note. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A computerized simulation of a simple singlestage vapour compression refrigeration system has been made.
Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which. Simple vapour compression refrigeration system with diagram. We will cover the theory behind an ideal vapour compression cycle, so the performance of this would be slightly different to the real world scenario. Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle. Pdf textbook of refrigeration and airconditioning by r. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. Vapour compression refrigeration cycle mcqs with answers. The above figure shows the objectives of refrigerators and heat pumps. Jul 02, 2019 design and analyse a refrigeration system. A textbook of refrigeration and air conditioning simple vapour. Vapor compression refrigeration system basic, working, parts of. Apparatus figure 1 shows the experimental setup in details. Simple vapour compression refrigeration system with. To study works principle of steam jet refrigeration system.
Vaporcompression cycle thermodynamic cycle of heat pumps. In domestic refrigerators, the most used cooling system is vapour compression, as it has a good value of cop. The vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Compression refrigeration cycles take advantage of the fact that highly compressed fluids at a certain temperature tend to get colder when they are allowed to expand. Simple vapour compression system the schematic diagram of the arrangement is as shown in fig.
Different vapor compression refrigeration system if output of compressor is dry saturated vapor, 10. Both a steadystate and a transient simulation will be considered. Multistage vapour compression refrigeration systems. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. In domestic refrigerators, the most used cooling system is vapour compression, as it. Vaporcompression cycle refrigeration cycle vaporcompression cycle thermodynamic cycle of heat pumps. Cop for ideal vapor absorption refrigeration system 9. Vapour cycles can be subdivided into vapour compression systems, vapour absorption. Nptel mechanical engineering refrigeration and air.
The steadystate simulation uses the accurate property correlations developed by cleland. Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. In the mechanical refrigerating system shown in fig12. Mechanism of simple vapour compression refrigeration system. The compressor, condenser, throttle and evaporator are analyzed separately from each other. Scroll to the bottom to watch the youtube tutorial video. From there the vapour refrigerant flows through a tube to the inlet of the compressor 1 to close the cycle. Latent heat involved in phase change ensures high value of heat removal, while air refrigeration system has sensible heat only. Experimental setup and procedures the experimental set up of a simple vapour compression refrigeration system used in study is shown in fig.
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. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration. Sep 09, 2015 thus while the energy input is in the form of mechanical energy in vapour compression refrigeration systems, it is mainly in the form of thermal energy in case of absorption systems. Theoretical exergy analysis of hfo1234yf and hfo1234ze as. The following study is focused towards finding out the effect of the capillary tube on the performance of the refrigeration system. This is achieved by using a substance called a refrigerant, which absorbs heat and hence boils or evaporates at a low pressure to form. Difference between vapour compression and vapour absorption pdf. 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. Analysis of a vaporcompression refrigeration cycle maplesoft. 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.
Twostage compression cycle with one evaporator and intercooling with flash gas 53. In any refrigeration process, heat is transferred from one region to another with the aid of an external agent. Vapour absorption refrigeration system with diagram. Twostage compression cycle with one evaporator and intercooler with water 51. Refrigeration is very essential requirement for low temperature storage of different food and. Refrigerant4a is the working fluid in an ideal compression refrigeration cycle.
Example problem simple vapor compression refrigeration. Refrigerants for vapour compression refrigeration systems. Most of the modern refrigerators work on this cycle, in its simplest form, there are four fundamental. Apr 23, 2020 in any refrigeration process, heat is transferred from one region to another with the aid of an external agent. The simplest explanation of this system is a heat engine working in reverse, technically referred to as reverse carnot engine. In this system, the working substance is a refrigerant like nh 3, r11, r12. The standard vapour compression refrigeration system section 10. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Vapor compression refrigeration an overview sciencedirect.
The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. Pdf a computerized simulation of a simple singlestage vapourcompression refrigeration system has been made. Problem solution of simple saturated vapor compression cycle duration. 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. Before moving further on differences lets have an overview of both the vapour compression. The presentation will give you idea about the vapor compression refrigeration system. Vapor compression refrigeration system basic, working. A simple vapour compression refrigeration system consists of mainly five components namely compressor, condenser, expansion device, evaporator and a filterdrier.
Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Flownex was used to simulate a vapour compression refrigeration system using r22 as refrigerant. The vapour at low pressure and low temperature point 2 enters to compressor where it is compressed reversible adiabatically isentropically. The simple vapour compression refrigeration cycle is shown in fig. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. Other systems employed are gas refrigeration, vapor absorption refrigeration, and vortex refrigeration. In simple commercial refrigeration systems the compressor is normally. The coefficient of performance of a refrigeration system is. At the bottom of the articles you can download pdf. What is vaporcompression cycle refrigeration cycle. Working and mathematical analysis of above systems. 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 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. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. Comparison of compound compression with single compressor system. Among these the vapour compression refrigeration systems are predominant. Vapour compression cycle generally known as vcc is a refrigeration cycle. Natural gas plants, petroleum refineries, and petrochemical plan. Schematic of a simple vapour compression refrigerator. An experimental study of the effect of capillary tube.
Hfc4a in simple vapour compression refrigeration system naushad a. If you continue browsing the site, you agree to the use of cookies on this website. The solution pump work is often negligible compared to the generator heat input. 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. In this type of refrigerator, refrigerant undergoes phase changes. In this article we will discuss about simple vapour compression refrigeration system. Compressors, psychrometry and applications of refrigeration and air conditioning have been included and updated for students to conceptualise the subject in a complete manner. 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. Jun 01, 2017 vapour compression refrigeration system in hindi refrigeration lec01 duration. Pdf textbook of refrigeration and air conditioning by r. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon.
In this article were going to be looking at how to design and analyse a refrigeration system. Example use the refrigerant4a tables 1 1 1 1 1 238. The refrigeration system were also used for providing cooling and humidification for summer comfort air conditioning 3. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. Pdf simulation of a simple vapourcompression refrigeration. Ppt vapour compression cycle powerpoint presentation free. Theoretical exergy analysis of hfo1234yf and hfo1234ze. Components of vapour compression refrigeration cycle compressor the low pressure saturated vapour refrigerant from evaporator drawn into the compressor through suction valve. Twostage compression cycle with one evaporator and intercoolerflash tank 55. The vapor compression refrigeration cycle, step by step araner. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. Numericals on multievaporation and compression systems module 6. To study various controls used in refrigeration and airconditioning system. 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.
It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Find cop r and cop r, carnot for the same t max and t min, and the tons of refrigeration. The figure depicts a typical, singlestage vaporcompression system. Mar 19, 2020 refrigerant 4a is the working fluid in an ideal vaporcompression refrigeration cycle that communicates thermally with a cold region at 0c and a warm region at 26c. It is also used in domestic and commercial refrigerators, largescale warehouses for. Aug 30, 2019 vapor compression refrigeration cycle. 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. The refrigerant vapour is compressed in the compressor process 12, condensed in the condenser. 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. The behavior of performance parameters of a simple vapour compression refrigeration system were studied while its working under transient conditions.
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. The evaporator and condenser are fabricated as shell and tube type adiabatic. Design and simulation of a vapor compression refrigeration cycle for a micro refrigerator submitted by seyfettin yildiz in partial fulfillment of the requirements for the degree of master of science in mechanical engineering department, middle east technical university by, prof. Refrigeration and air conditioning pdf book agrimoon. Vapour compression refrigeration system using ammonia as refrigerant is widely used in india for industrial refrigeration, air conditioning and cold storages. Vapour compression cycle definite guide with video. Ppt vapour compression cycle powerpoint presentation. In the vaporcompression refrigeration system, which is widely used, the external agent is a compressor. Vapour compression refrigeration system longdom publishing sl. Advantages and disadvantages of air refrigeration system mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator, and heat pump. It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings.
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