Layout of the r22 vapour compression refrigeration system. 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 an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. Refrigeration cycles the vapor compression refrigeration cycle is a common method for transferring heat from a low temperature to a high temperature. Vapour absorption refrigeration system working,diagram introduction. Vapor compression refrigeration system basic, working. Jun 01, 2017 vapour compression refrigeration system in hindi refrigeration lec01 duration. The vapor compression refrigeration cycle is virtually rankine cycle with the. Components of vapour compression refrigeration cycle compressor the low pressure saturated vapour refrigerant from evaporator drawn into the compressor through suction valve. Apparatus figure 1 shows the experimental setup in details. 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 component of the modern day refrigeration system wh. These systems belong to the general class of vapour cycles, wherein the working fluid refrigerant undergoes phase change at least during one process. The working fluid called refrigerant completes its function upon evaporation during which it absorbs the heat in an amount equivalent to its refrigerating effect.
Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2. Difference between vapour compression and vapour absorption pdf. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 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. In vapour compression refrigerating system, the work is supplied by the compressor. Vocabulary background in the thermodynamics and refrigeration literature, several words are used interchangeably that can cause confusion. 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. Pdf vapour compression refrigeration system generating. Vapor compression refrigeration systems are used for a variety of cooling refrigeration applications. Design of two stage vapour compression refrigeration system. Refrigeration onboard ships marine engineering study.
Vapour compression cycle generally known as vcc is a refrigeration cycle. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. This is the part of the refrigeration system that is doing the actual cooling. Pdf design and construction of a vapour compression. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle. Natural gas plants, petroleum refineries, and petrochemical plan.
The work is supplied to the system from the surroundings. 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. Vapor compression refrigeration cycle working principle. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram.
Some basic refrigeration cycles are discussed here through different diagrams. Layout of the r22 vapourcompression refrigeration system. Environmentally benign natural refrigerants have recently attracted a considerable. 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. Both a steadystate and a transient simulation will be considered. Vapor compression refrigeration system basic, working, parts of. The refrigerant is let into and measured by a flow control device, and eventually released to the. Thermodynamic analysis of the performance of a vapour. Heat rejection from the lower cycle to the upper cycle takes place in an. 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. Vapour compression refrigeration system refrigeration. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant.
May 10, 2017 learn about vapour compression refrigeration system. Apr 02, 2016 vapour compression refrigeration system 1. Vapor compression refrigeration cycle working principle duration. Pdf thermodynamic analysis of performance of vapour.
Refrigeration and air conditioning systems onboard ships. Vapor compression refrigeration an overview sciencedirect. Hrnjak, in 8th international conference on compressors and their systems, 20. A vapour compression refrigeration system is the most widely used. 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 presentation will give you idea about the vapor compression refrigeration system. Simple vapour compression refrigeration system with diagram. Vapour absorption refrigeration system working,diagram. Since jacob perkins ice machine built in 1834, vapor compression refrigeration cycle vcrc has been in service of human beings. Refrigeration cycle is the basis of all refrigeration systems. 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. From there the vapour refrigerant flows through a tube to the inlet of the compressor 1 to close the cycle. A working fluid often called the refrigerant is pushed through the system and undergoes state changes from liquid to gas and back. Design of two stage vapour compression refrigeration. The coefficient of performance of a refrigeration system is.
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. 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. The simple vapour compression refrigeration cycle is shown in fig. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. In this type of refrigerator, refrigerant undergoes phase changes. Latent heat involved in phase change ensures high value of heat removal, while air refrigeration system has sensible heat only. 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. Simple vapour compression refrigeration system with. In this article we will discuss about simple vapour compression refrigeration system. Each stage operates on an ideal vapor compression refrigeration cycle with refrigerant4a as the working fluid. There are many type of refrigeration system one of them is vapour absoption refrigeration system. System description the layout of the system is shown in figure 1. 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 most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. First, evaporation is simply the process of vaporization these two terms are essentially synonymous. Vapor compression refrigeration cycle this refrigeration cycle is approximately a rankine cycle run in reverse. Learn about vapour compression refrigeration system.
Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. 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. The refrigerants hfc152a, hfc32, hc290, hc1270, hc600a and re170 were used as the working fluid for the comparison with the conventional refrigerant r4a. It condensed and evaporates at temperatures and pressures close to the atmospheric conditions. This approach involves the operation of a vapor compression refrigeration cycle to induce heat to travel in a direction contrary to gross environmental. Pdf vapour compression refrigeration system generating fresh. Vapor compression refrigeration systems are used for a variety of coolingrefrigeration applications. This is the principle behind vapour compression systems. The vapor compression refrigeration cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. Ppt vapour compression cycle powerpoint presentation.
Refrigerants for vapour compression refrigeration systems. Pdf in vapour compression refrigeration system, it generates fresh. 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. The above figure shows simple vapour compression refrigeration system. 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. Vapour compression refrigeration system refrigeration heat. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. Vapour compression cycle definite guide with video. Refrigeration onboard ships marine engineering study materials. In this cycle, the refrigerant is sealed condition in an airtight mechanism is compressed in a compressor which permits the transfer of heat energy. If you continue browsing the site, you agree to the use of cookies on this website. Vapour compression refrigeration system refrigeration vapour.
The selection of working fluid has a significant impact on the performance of the. Mechanism and working of a vapour compression refrigeration. Feb 10, 2017 the presentation will give you idea about the vapor compression refrigeration system. Vapour compression refrigeration system the vapour compression refrigeration system is widely used in commercial and domestic refrigeration and air conditioning plants. The above figure shows the objectives of refrigerators and heat pumps. Refrigeration is a process of cooling or maintain a body at lower temperature than surrounding.
The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved. Vapour absorption refrigeration system with diagram. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of rankine cycle is replaced by. The refrigerant absorbs heat from one place and releases it to another place. The latent heat of vaporization of the refrigerant is used to transfer large amounts of heat energy.
The ideal vapour compression cycle is shown on the pressureenthalpy diagram of figure 1. The vapor compression refrigeration cycle, step by step. Vapour compression refrigeration system free download as powerpoint presentation. To study works principle of steam jet refrigeration system. Consider a twostage cascade refrigeration system operating between the pressure limits of 0.
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. 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. 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. The vapour used is cycled between liquid and gaseous phases. Twophase liquidvapor mixture vapour compression refrigeration system vapour compression refrigeration systems are the most commonly used among all refrigeration systems. The standard vapor compression refrigeration system is a condenser, evaporator, throttling valve, and a compressor. The vapor compression refrigeration cycle is virtually rankine cycle with the only difference that pump of.
The temperature at which a fluid boils or condenses is known as. Thus, in a vapour compression system, we must have a. The effects of the main parameters of performance analysis such as refrigerant type. In this system, the working substance is a refrigerant like nh 3, r11, r12. The vapor compression refrigeration cycle is a common method for transferring heat. 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. 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.
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. 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. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which. This refrigeration system is different from compression refrigeration system.
However, unlike vapour compression refrigeration systems, the required input to absorption systems is in the form of heat. The absorption systems have experienced many ups and downs. Lecture16 simple vapour compression refrigeration system. So refrigeration cycle should be known to understand the refrigeration system. The purpose of a refrigerator is the removal of heat, called the cooling load, from a lowtemperature medium. 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. Vapour compression cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used. Ppt vapour compression cycle powerpoint presentation free. However, commercially successful compression refrigeration systems working with ammonia were introduced in. It can be used whenever a refrigeration or airconditioning requirement occurs. These all four components run a simple vapour compression refrigeration system. A textbook of refrigeration and air conditioning simple vapour.