This vapour compression system mainly consists of a refrigerator compressor, a liquid compressor, a liquid receiver, a refrigerant control valve also called as an expansion valve and evaporator. Refrigeration and air conditioning pdf book agrimoon. Compressor the low pressure and temperature vapour refrigerant from evaporator is drawn into the compressor through the inlet or suction valve a, where it is compressed to a high pressure and temperature. What are the commonly used refrigerants for vapour compression chillers.
System description the layout of the system is shown in figure 1. The equations of exergetic efficiency and exergy destruction for the main system components such as compressor, condenser expansion device, liquidvapour heat exchanger and evaporator are developed. This is a pdf on the basic vapour compression cycle. The system has more weak, tear and noise due to moving parts in the compressor. It is used for all industrial purposes from a small domestic refrigerator to a big air conditioning plant. Refrigeration and air conditioning systems onboard ships vapour. Vapour compression cycle free download as powerpoint presentation. Tevs sensing bulb is placed near to the compressor suction where vapour is present in the supreheated form inside the l. This paper focuses on vapor injection in scroll compressors used in airconditioning and refrigeration applications. Vapour compression refrigeration system slideshare. A single stage vapour compression refrigeration system has one low side.
Remaining cycle processes remain unchanged as shown. The design and construction of a refrigerator as a test rig, in investigating the performance of liquefied petroleum gas lpg, which has zero ozone depleting potential and very low global warming potential, as working fluid in vapour compression. This is the part of the refrigeration system that is doing the actual cooling. The saline water is evaporated at subatmospheric pressure. 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. Vaporcompression refrigeration, in which the refrigerant undergoes. Fundamentals of mechanical refrigeration systems course content. The vapor compression refrigeration cycle, step by step. The prime energy consumer is the vapor compressor, accounting for over 80% of the total energy requirements. Vocabulary background in the thermodynamics and refrigeration literature, several words are used interchangeably that can cause confusion.
The vapor compression refrigeration cycle has four components. Commonly used refrigerants for vapour compression chillers are chlorinated fluorocarbons cfcs, also called freons. A textbook of refrigeration and air conditioning simple vapour. The purpose of this document is to provide the heating scroll compressor users first selection of components for their refrigerant circuit using vapour injection. Pdf vapour compression refrigeration system generating fresh. Download pdf lectures on vapour absorption refrigeration system. And the libr being a salt has a recrystallization zone when it becomes solid and hence imposes flow. Layout of the r22 vapourcompression refrigeration system. Course content a vapor absorption chiller machine vam is a machine that produces chilled water. Refrigerant r22 vapour enters a positive displacement compressor at a slightly. It is also used in domestic and commercial refrigerators, largescale warehouses for. Technology and applications gea engineering for a better. Vapor compression refrigeration system basic, working, parts of.
From the above expression, it can be seen that specific work input reduces as specific volume, v 1. Performance evaluation of vapour compression refrigeration system with three layer zig zag shaped evaporator. Numericals on multievaporation and compression systems module 6. The analysis of the compressor dis discharge variation of physical properties and performance parameters of ii. Beeton and pham 2003, describe successful implementation of the vi in scroll refrigeration systems using r404a. Selection of a refrigerant for a vapour compression system depends on which among the following. Thus, in a vapour compression system, we must have a compressor which. Vapor injection has also been employed with screw compressors, with an increase in both capacity and system cop. The effect of compressing water vapour is obtained by means of an electrically driven, mechanical centrifugal compressor. Pdf design and construction of a vapour compression. Typical vapor compression systems can be represented as shown in figure 5. The schematic diagram of the arrangement is as shown in fig. Both a steadystate and a transient simulation will be considered. A computerized simulation of a simple singlestage vapourcompression refrigeration system has been made.
The simplest explanation of this system is a heat engine working in reverse, technically referred to. During condensation, this thermal energy has to be dissipated again. The most widely used refrigeration cycle is the vapor compression refrigeration cycle. The vapor compression refrigeration cycle is a common method for transferring heat. Refrigerants for vapour compression refrigeration systems. Basics of vapour compression refrigeration system vcrs by mona yadav duration. First, evaporation is simply the process of vaporization these two terms are essentially synonymous. On the condenser side, refrigeration system is used as a heat pump for heating applications such as process heating, drying etc. Compressor is said to the heart of the vapour compression system compresses the vapour refrigerant from the evaporator pressurepe to the condenser pressure pc, so that vapour can be condensed at the. Refrigeration cycle l vapour compression refrigeration cycle l mechanical refrigeration cycle l mrc. Vapour compression is a distillation process, where evaporation of sea or brackish water is obtained by the application of heat delivered by compressed vapour. Pdf in vapour compression refrigeration system, it generates fresh drinking water and also extracts water from humid ambient air by using. A refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. These recommendations give a starting point for designing and building heat pump systems.
The vapour is drawn in the compressor cylinder at the condition of 1. Nevertheless, system performance and reliable operation have to be verified by the. In the proposed system the compressor work is less than compressor work of existing system. Since in a compression system the energy consumption is related to mass flow, head and. In the vapor absorption process, the compression process of the vapor compression cycle is replaced by an absorber, a generator and a pump.
Design of two stage vapour compression refrigeration system with water intercooler 1pravin d. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. In this system, the working substance is a refrigerant like nh 3, r11, r12. Work is supplied to the compressor during the isentropic compression 12 of refrigerant vapour from evaporator pressure pe to condenser pressure pc, and work. 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. 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.
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. Refrigeration systems are also rated in terms of tons of refrigeration. Review of vapour absorption refrigeration and vapour. Vapour compression cycle definite guide with video. Oil separator is not required in refrigeration system if.
Vapor compression refrigeration system basic, working. The vapour compression cycle which is used in vapour compression refrigeration system is nowadays used for all purpose refrigeration. Working and mathematical analysis of above systems. Vapor injection in scroll compressors purdue epubs. The system is quiet in operation due to less number of moving parts. Comparison of compound compression with single compressor system. In the vapour absorption system, an absorber, a pump, a generator and a pressurereducing valve replace the compressor. Vapor compression system an overview sciencedirect topics. 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 concentrated, from which the. 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.
Distilled water is produced from sea water by evaporation in a singleeffect evaporator working on the vapour compression system. The principle of the system is to make use of two substances that can be separated when heated. 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. This refrigeration system is different from compression refrigeration system. Vapor compression refrigeration system basic, working, parts of system introduction.
Refrigeration and air conditioning systems onboard ships. The vapor compression refrigeration cycle, step by step araner. By using the vapour produced as heat ing steam in a second effect, the energy requirement of the overall system will nearly halve. In an ideal vapor compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to. Vapour compression refrigeration system free download as powerpoint presentation. Vapor absorption refrigeration cycle or vapor absorption refrigeration system vars pdf. Refrigerant r22 vapour enters a positive displacement compressor at a slightly superheated state 1 and is then compressed to state 2. Vapour compression refrigera tion system, refrigerant, ozone depletion, global warming, cfc. Vapour compression refrigeration system generating fresh water from humidity in the air conference paper pdf available january 2011 with 4,091 reads how we measure reads.
The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. Design of two stage vapour compression refrigeration. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. Vapour compression refrigeration system refrigeration heat.
The vapour absorption system uses heat energy, instead of mechanical energy as in vapour compression systems, in order to change the conditions of the refrigerant required for the operation of the refrigeration cycle. Joshi 1 department of mechanical engineering, walchand college of engineering, sangli 416415, maharashtra, india abstract refrigeration is the process of reducing and maintaining the temperature of a space or material below the. Vapour compression cycle refrigeration atmospheric. Gandhinagar institute of technology subject applied thermal and hydraulic engineering2140907 branch electrical topic refrigeration vapour compression refrigeration system 2. Changes in mvr process chemistry, feed, throughput, seasonal, etc. Vapourcompression refrigeration or vaporcompression refrigeration system vcrs, in which. The vapor compression refrigeration cycle involves four components. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. Simple vapour compression refrigeration system with. In a vapor compression refrigeration system a gas refrigerant is alternatively compressed and expanded and goes from the liquid to the vapor state. In compression refrigeration system we used a compressor which is run by electricity but absorption refrigeration system always runs by using a heat source. In which range of temperature the application of brine plants are made. The refrigerant, while passing through the condenser, gives up its latent heat to the surrounding.
The sub cooling increases refrigerating capacity whereas there is no change in compressor work. Performance evaluation of vapour compression refrigeration. It is a compression process, whose aim is to raise the refrigerant pressure, as it flows from an evaporator. Selection of a refrigerant for a vapour compression system. This paper provides a detailed exergy analysis for theoretical vapour compression refrigeration cycle using r404a, r407c and r410a. Vaporcompression 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. The steadystate simulation uses the accurate property correlations developed by cleland.
The vapour produced is compressed by a mechanical compressor at 50 per cent efficiency and then returned to the calandria of the evaporator. They are evaporator, compressor, condenser and expansion device. Vapor compressor technologies products and services howden. There are many type of refrigeration system one of them is vapour absoption refrigeration system. In the absorption system, the compressor is replaced by the combination of an absorber, a generator, and a pump. Power is supplied to the compressor and heat is added to the system in the.
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