So improvement of performance of system is too important for higher refrigerating effect or reduced power consumption for same refrigerating effect. 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. Nptel mechanical engineering refrigeration and air. This paper presents a theoretical study about the effect of condenser subcooling on the performance of vapor compression systems. The ph diagram of the vapor compression refrigeration cycle is presented in figure 2. The ideal refrigeration cycle is considered with the following conditions. Why does it need to be a superheated vapor in order to be condensed. Ueeneej103a establish the basic operating conditions of vapour compression systems. It is the main component of a refrigeration system. Modeling and investigation of refrigeration system performance with twophase fluid injection in a scroll compressor rui gu marquette university, 2016 vapor compression cycles are widely used in heating, refrigerating and airconditioning. It is used for all industrial purpose from a small domestic refrigerator to a big air conditioning plant. Vapourcompression units are the most widely used refrigeration systems. The typical vapor compression system consist of four components.
In a vaporcompression refrigeration system i would like to understand the following. The objective of this paper is to study the effect of evaporator load on performance of vapour compression refrigeration system with hydrocarbon refrigerants at different loads in evaporator. To study various controls used in refrigeration and airconditioning system. Effect of the condenser subcooling on the performance of. A standard refrigeration cycle consists of four processes of the refrigerant. Nonvapor compression hvac technologies report department. So refrigeration cycle should be known to understand the refrigeration system. While vaporcompression technologies have served heating, ventilation, and airconditioning hvac needs very effectively, and have been the dominant hvac technology for close to 100 years, the conventional refrigerants used in vaporcompression equipment contribute to global climate change when released to the atmosphere. The refrigerant is circulated through the system and it undergoes a no of changes in its state while passing through various components of the system. Vapourcompression refrigeration systems sciencedirect. Refrigerants for vapour compression refrigeration systems.
It condenses and evaporates at temperatures and pressures close to the atmospheric conditions. Layout of the r22 vapourcompression refrigeration system. Mar 09, 2016 comparison of vapor absorption system with vapor compression system can be done in 9 aspects. Cant the saturated vapor from the evaporator be cooled directly in the condenser. Twostage compression cycle with one evaporator and intercooler with water 51. Dedicated subcooling is to use a separate refrigeration system with the main system. For purposes of illustration, we will assume that a refrigeration system used to cool air for an office environment. Pdf experimental analysis of vapour compression refrigeration. In this article we will discuss about simple vapour compression refrigeration system. Design of two stage vapour compression refrigeration. These all four components run a simple vapour compression refrigeration system. Pdf effect of evaporator temperature on vapor compression. Vapor compression refrigeration system basic, working.
Interactive computer routines have been composed, in basic language, in order to. It is also used in domestic and commercial refrigerators, largescale warehouses for chilled or frozen storage of foods and meats. Some basic refrigeration cycles are discussed here through different diagrams. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. This case study demonstrates the modeling of a vapour compression refrigeration system using r22 as refrigerant. 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. Modeling and investigation of refrigeration system.
Performance analysis of vapour compression refrigeration system with r404a, r407c and r410a jyoti soni 1 and r c gupta corresponding author. Dec 31, 2016 vapour compression refrigeration system 1. Pdf in vapour compression refrigeration system, it generates fresh drinking water and also extracts water from humid ambient air by using. Review of vapour absorption refrigeration and vapour. Tafe nsw training education support, industry skills unit meadowbank 2012. Refrigeration system the conventional vapour compression refrigeration system consists of four major components namely compressor, condenser, expansion device and evaporator. It also includes the process of maintaining and reducing the temperature of a body below the general temperature of its surroundings. Exergy flow destroyed in each of the components is evaluated as follows 3, 9. Vapor compression refrigeration system on ph diagram. Vapor compression refrigeration cycle objective determining the coefficient of performance of a vapour compression refrigeration cycle. Refrigeration system components level of detail circle one too basic just right too difficult one of the fundamental series rate this clinic from 1needs improvement to 10excellent trgtrc005en content 123456789 10 booklet usefulness 123456789 10. Pdf vapour compression refrigeration system generating fresh. The vapour compression refrigeration cycle is based on the following factor.
Apr 18, 2014 assuming the compression process to be isentropic find. Both a steadystate and a transient simulation will be considered. Please take a moment to comment on the effectiveness of this air conditioning clinic. Each such change in the state of vapor is called a process. Twostage compression cycle with one evaporator and intercooling with flash gas 53.
International journal of students research in technology. 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. The refrigerant is compressed to high pressure and temperature in compressor, rejects heat in condenser and absorbs heat. Due to the presence of subcooled liquid fig 1b, the twophase heat transfer area would be reduced relative to a condition without subcooling fig 1a. It is shown that, as condenser subcooling increases, the cop reaches a maximum as a result of a tradeoff between increasing refrigerating effect and specific compression work. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. In simple vapour compression refrigeration system pressure ration up to specific limit can be achieved. Improved vapour compression refrigeration cycles purdue epubs. 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 system, the working substance is a refrigerant like nh 3, r11, r12. Globally residential, commercial and industrial air. A performance comparison of vapour compression refrigeration.
The figure depicts a typical, singlestage vapor compression system. Effect of evaporator temperature on vapor compression refrigeration system 287 however, in the presence of oil, this optimum is located at val ues of the overheat that vary between 1. It can be used whenever a refrigeration or airconditioning requirement occurs. A vapour compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used. Need of multistage refrigeration system simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator.
According to the results of their experiments, the refrigerant r290r600a had a refrigerating capacity 28. 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. In this type of system, the refrigerant flows through a closed cycle in the following four states. A vapor compression refrigeration system uses a refrigerant sealed in an airtight and leak proof mechanism. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapourcompression refrigerators when employing refrigerant r11, r12, r22 or r502. The refrigeration system used was a direct air expansion. Vapour compression heat pumps are refrigeration systems. To study works principle of steam jet refrigeration system. How vaporcompression cooling works electronics cooling. For a decade, due to the tendency of miniaturization in technology, an effort to produce this. A textbook of refrigeration and air conditioning simple vapour.
Vapour compression units are the most widely used refrigeration systems. Vapor compression cycle thermodynamic cycle of heat pumps. For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required. Thermodynamic analysis of modified vapour compression. The standard vapour compression refrigeration system section 10. Temperature entropy t 2 t 1 s4 s1 net work refrigeration 3 2 4 1 fig. Simultaneous compression and cooling in vapor compression. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy.
The refrigerant used does not leave the system but is circulated throughout the system. Effect of evaporator temperature on vapor compression. Simple vapour compression refrigeration system with diagram. Ueeneej103a establish the basic operating conditions of. Comparison of vapor absorption system with vapor compression. The most commonly used system for industrial and commercial refrigeration is the vapour. To study the analysis of simple vapour compression cycle and explain the types of vapour compression cycle with ts and ph diagram. Vapor compression refrigeration cycle engineering essay. The refrigeration capacity is 8 tr and the compression is adiabatic reversible process.
Thermodynamicsbased optimization and control of vapor. 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 cycle is an improved type of air refrigeration cycle in which a suitable working substance, termed as refrigerant, is used. What is vaporcompression cycle refrigeration cycle. While vapor compression technologies have served heating, ventilation, and airconditioning hvac needs very effectively, and have been the dominant hvac technology for close to 100 years, the conventional refrigerants used in vapor compression equipment contribute to global climate change when released to the atmosphere. Vapour compression refrigeration system linkedin slideshare. A slight performance improvement in the components of a vapor. Apparatus figure 1 shows the experimental setup in details. Design of two stage vapour compression refrigeration system.
Temperatureentropy diagram for the carnot refrigeration cycle. The vapor compression refrigeration system consists mainly of a refrigerant compressor, condenser, refrigerant control valve or expansion valve and an evaporator. Most of the commercial refrigeration plants, hvac plants, home airconditioners and refrigerators, etc. The refrigeration system is an enclosed gas tight system of tubes and equipments as shown below. Air conditioning clinic refrigeration system components. Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser, expansion valve and evaporator. Since jacob perkins ice machine built in 1834, vapor compression refrigeration cycle vcrc has been in service of human beings. Vapour compression refrigera tion system, refrigerant, ozone depletion, global warming, cfc. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. 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.
Liquidsuction subcooler is using a heat exchanger, the heat exchange of the liquid line output condenser to suction compressor inlet. Interactive computer routines have been composed, in basic language, in order to permit the prediction of the performances of simple, multievaporator multistage compressor vapour compression refrigerators when employing refrigerant r11, r12, r22 or r502. 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 refrigeration system is a combination of components and equipment connected in a sequential order to produce the refrigeration effect. The refrigeration capacity is 8 tr and the compression is. Refrigeration cycle is the basis of all refrigeration systems. Vaporcompression refrigeration physics stack exchange. Pdf experimental analysis of a vapour compression refrigeration.
Experimental analysis of a vapour compression refrigeration system by using nano refrigerant r290r600aal2o3. Multistage vapour compression refrigeration example1 two stage compression system with water intercooler uses r4a as shown in figure1. The exergetic balance equation for a control volume is. Introduction a vapour compression refrigeration system is an improvised type of air refrigeration system in which a suitable working substance termed as refrigerant is used. Heat balance and energy balance of each component of the system will make the perfect energy assessment of the whole system.
Key components in the refrigeration system are a compressor, a condenser, an evaporator and an expansion valve. The vapour compression refrigeration system is now days used for allpurpose refrigeration. Vapour compression refrigeration cycle is the most widely used refrigeration system. The evaporating temperature is 25 oc and condensing temperature 47 oc. The refrigerants generally used for this purpose are ammonia nh3 carbon dioxideco2 and sulphur dioxideso2. Layout of the r22 vapour compression refrigeration system. Vapor compression refrigeration system basic, working, parts of system, advantages, and disadvantages introduction.
Vapour compression refrigeration cycle on ph diagram the ph diagram is frequently used in the analysis of vapour compression refrigeration cycle and usually consists of the four processes. How an expansion valve works exactly physically speaking. Refrigeration may be defined as a process of removing heat from a substance and pumping it to the surroundings. System description the layout of the system is shown in figure 1. Vapour absorption system vapour absorption system is an attractive method for utilizing low grade energy directly for cooling. Performance analysis of vapour compression refrigeration. Jul 22, 2016 for the love of physics walter lewin may 16, 2011 duration. Pdf now a days, researchers focused on use of nano additive refrigerants in vapour compression refrigeration system vcrs because of. The vapor compression 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.
1401 1135 402 1338 1498 228 1538 315 596 731 1198 759 1498 1464 653 523 1158 1228 990 244 540 580 373 1075 905 810 426 160 768 52 1427 523 1163 350 1446 889 338 736 272 1317