The effects of the main parameters of performance analysis such as refrigerant type. The presentation will give you idea about the vapor compression refrigeration system. However, commercially successful compression refrigeration systems working with ammonia were introduced in. From there the vapour refrigerant flows through a tube to the inlet of the compressor 1 to close the cycle. System description the layout of the system is shown in figure 1. It condensed and evaporates at temperatures and pressures close to the atmospheric conditions. 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. Vapor compression refrigeration system basic, working.
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. The refrigerant absorbs heat from one place and releases it to another place. The refrigerant is let into and measured by a flow control device, and eventually released to the. 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. Learn about vapour compression refrigeration system. Refrigeration and air conditioning systems onboard ships. The latent heat of vaporization of the refrigerant is used to transfer large amounts of heat energy. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. A vapour compression refrigeration system is the most widely used. Natural gas plants, petroleum refineries, and petrochemical plan.
The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of rankine cycle is replaced by. 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. The absorption systems have experienced many ups and downs. Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. The temperature at which a fluid boils or condenses is known as. The above figure shows simple vapour compression refrigeration system. May 10, 2017 learn about vapour compression refrigeration system. Vapour compression cycle definite guide with video.
Vapour compression refrigeration system refrigeration heat. Lecture16 simple vapour compression refrigeration system. Figure below is a schematic of the components and flow arrangements for the vapor compression cycle. British thermal unit and is equivalent to 778 ftlbf of work 1 w 3. The ideal vapour compression cycle is shown on the pressureenthalpy diagram of figure 1.
Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. Vapor compression refrigeration systems are used for a variety of coolingrefrigeration applications. Pdf in vapour compression refrigeration system, it generates fresh. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats.
Vapor compression refrigeration system basic, working, parts of. The vapor compression refrigeration cycle is virtually rankine cycle with the. Thus, in a vapour compression system, we must have a. 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. Vapour compression refrigeration system refrigeration vapour. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Some basic refrigeration cycles are discussed here through different diagrams. The above figure shows the objectives of refrigerators and heat pumps. 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. A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. Simple vapour compression refrigeration system with diagram. In vapour compression refrigerating system, the work is supplied by the compressor.
Vapour absorption refrigeration system working,diagram introduction. Pdf vapour compression refrigeration system generating. 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. 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. Because its function is to absorb heat into the refrigeration system from where you dont want it, the evaporator is placed in the area to be cooled. Vapour compression refrigeration system the vapour compression refrigeration system is widely used in commercial and domestic refrigeration and air conditioning plants. 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. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. If you continue browsing the site, you agree to the use of cookies on this website. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Pdf vapour compression refrigeration system generating fresh. 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 vapor compression refrigeration cycle, step by step. Layout of the r22 vapourcompression refrigeration system. The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Apparatus figure 1 shows the experimental setup in details.
This refrigeration system is different from 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. Each stage operates on an ideal vapor compression refrigeration cycle with refrigerant4a as the working fluid. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. 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 absorption refrigeration system with diagram. The work is supplied to the system from the surroundings. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a direction contrary to gross environmental. Difference between vapour compression and vapour absorption pdf. Pdf thermodynamic analysis of performance of vapour. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved.
The liquid to gas phase change absorbs heat from the surrounding the evaporator and vapour to liquid change needs work to be done, and is supplied by a compressor. Ppt vapour compression cycle powerpoint presentation. Mechanism and working of a vapour compression refrigeration. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. Jun 01, 2017 vapour compression refrigeration system in hindi refrigeration lec01 duration. To study works principle of steam jet refrigeration system. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. Twophase liquidvapor mixture vapour compression refrigeration system vapour compression refrigeration systems are the most commonly used among all refrigeration systems. There are many type of refrigeration system one of them is vapour absoption refrigeration system. Since jacob perkins ice machine built in 1834, vapor compression refrigeration cycle vcrc has been in service of human beings. Advantages and disadvantages of air refrigeration system mechanism and working of a vapour compression refrigeration system comparison between heat engine, refrigerator, and heat pump. The standard vapor compression refrigeration system is a condenser, evaporator, throttling valve, and a compressor. The working fluid called refrigerant completes its function upon evaporation during which it absorbs the heat in an amount equivalent to its refrigerating effect.
Refrigeration onboard ships marine engineering study materials. 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. First, evaporation is simply the process of vaporization these two terms are essentially synonymous. Vapor compression refrigeration cycle working principle duration. However, unlike vapour compression refrigeration systems, the required input to absorption systems is in the form of heat. The vapour used is cycled between liquid and gaseous phases. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Refrigeration cycle is the basis of all refrigeration systems. 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 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. Environmentally benign natural refrigerants have recently attracted a considerable. Ppt vapour compression cycle powerpoint presentation free. It can be used whenever a refrigeration or airconditioning requirement occurs.
Design of two stage vapour compression refrigeration. Apr 02, 2016 vapour compression refrigeration system 1. Vapour absorption refrigeration systems vars belong to the class of vapour cycles similar to vapour compression refrigeration systems. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a. Vapour compression cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used.
The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. Vapour compression refrigeration system free download as powerpoint presentation. 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. Vapour absorption refrigeration system working,diagram. The selection of working fluid has a significant impact on the performance of the. In this system, the working substance is a refrigerant like nh 3, r11, r12. The coefficient of performance of a refrigeration system is. Both a steadystate and a transient simulation will be considered. Consider a twostage cascade refrigeration system operating between the pressure limits of 0. Vapor compression refrigeration cycle working principle. Vapor compression refrigeration cycle this refrigeration cycle is approximately a rankine cycle run in reverse.
This is the principle behind vapour compression systems. The simple vapour compression refrigeration cycle is shown in fig. This is the part of the refrigeration system that is doing the actual cooling. 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. A textbook of refrigeration and air conditioning simple vapour. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Vapour compression cycle generally known as vcc is a refrigeration cycle. Vapour compression refrigeration system refrigeration. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram.
Thermodynamic analysis of the performance of a vapour. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Hrnjak, in 8th international conference on compressors and their systems, 20. In this study, the performance of some hydrocarbon refrigerants r290, r600a and r1270 as alternatives to r22 in vapour compression refrigeration system was investigated theoretically employing a. Refrigerants for vapour compression refrigeration systems. Design of two stage vapour compression refrigeration system. Vapor compression refrigeration an overview sciencedirect. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. Refrigeration onboard ships marine engineering study. So refrigeration cycle should be known to understand the refrigeration system. Latent heat involved in phase change ensures high value of heat removal, while air refrigeration system has sensible heat only. Vocabulary background in the thermodynamics and refrigeration literature, several words are used interchangeably that can cause confusion.
A working fluid often called the refrigerant is pushed through the system and undergoes state changes from liquid to gas and back. The refrigerants hfc152a, hfc32, hc290, hc1270, hc600a and re170 were used as the working fluid for the comparison with the conventional refrigerant r4a. Vapor compression refrigeration systems are used for a variety of cooling refrigeration applications. 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.
Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which. Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. Refrigeration is a process of cooling or maintain a body at lower temperature than surrounding. Heat rejection from the lower cycle to the upper cycle takes place in an.
504 20 697 398 1215 188 191 1436 1271 286 125 664 1310 1458 747 1466 1610 1557 294 1239 1476 48 1501 1373 49 578 503 246 653 656 988 1184 450 393 346 61