Unwanted vapour generating during expansion process are strikes on baffle plates. Khurmi and Gupta [2] in their book gave evidence that the process of under cooling is also brought about by employing a heat exchanger. Mechanical with fifth rank in Shivaji University Kolhapur 2018. Basic of Refrigeration - methods - COP (HINDI) MechenggeniuS. To improve the coefficient of performance, its requires that the compressor work should decrease and refrigeration effect should increase. where T(L) is the lower temperature at which the evaporation takes place and T(H) is the condensing temperature at which the heat is thrown out to the surrounding. Liquid rejects its heat energy to vapour refrigerants and sub-cooling of liquid takes place. To improve the thermal performance of VCRS, following methods can be employed: ... & 0.5% with size of 50 nm particle on VCRS and also found maximum COP of 3.56 & 21% decline of power input was obtained with 0.5% concentration of ZnO. Under cooling of liquid refrigerant with the help of refrigerant gas. Way to increase COP : To improve COP its require that compressor work should decrease & refrigerant effect should increase. COP of VARS is much lower than the VCRS. Although VARS seem to be many advantages , VCRS still dominate all market sectors. I will share these information with my friends. Upon reaching the boiling point of the refrigerant, a further increase in temperature is superheat. The performance attributes of a vapor compression refrigeration system are studied. Performance enhancement of a vapor compression refrigeration system using R134a/MWCNT-oil mixture and liquid-suction heat exchanger equipped with twisted tape turbulator, Amélioration des performances d’un système frigorifique à compression de vapeur utilisant le e R134a/mélange d’huile et de MWCNT et un échangeur de chaleur à aspiration de liquide équipé d’un turbulateur à bandes torsadées, Système frigorifique à compression de vapeur, Échangeur de chaleur liquide à aspiration. 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 air-conditioning of buildings and automobiles. On the other hand, with R134a+0.5% Al2O3 and for Figure 4.3: Effect on suction & discharge Pressure of R134a+1% Al2O3 theoretical COP is found to be 3.75 and 3.54 compressor with and without Nano Refrigerant respectively. Two different refrigerant are R600a (Isobutene) and R134a (tetrafluoroethae).R134a is zero ozone depletion layer and high global warning and R600a is zero ozone depletion layer and negligible global warning. The effect obtained is only reduction in evaporator length of pipe. Flash chamber is an insulating tank. By under cooling the liquid refrigerant. COP = Heat removal (Cooling given) by refrigerant / work done by the Compressor. Advantages of multi-staging in vapor compression system: Advantages of multi-staging in vapor compression system are : 1. The method of the VDMA 24247-2 2 Energy efciency of refrigeration systems Requirements for the system design and the components were recently published. You can go for the hybrid cycle by coupling the heat pipe with conventional cycle improve the cop. Another option for COP improvement is the use of an ejector as an expansion valve in the vapour compression cycle (Figure 3a). The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work required. 7.5 Fig 7.4 improvement by vapour refrigerant. • All rights reserved. Unwanted vapour is directly supplied to compressor where as only liquid is supplied to Evaporator. As the ejector uses the kinetic energy of the flash gas to increase suction pressure at the compressor inlet, so the ejector expansion cycle also reduces the irreversibilities in the expansion process. Methods of improving. On decreasing the pressure of the condenser, the work input to the compressor decreases which increases the COP. Reaching the boiling point of the VCRS help me to know more information... / work done by the compressor COP: to improve COP its require that compressor work decrease! It is informative, it will help me to know more detailed information about Refrigerator with diagram... And evaporator are baffle plate on which mixer from expansion device strikes and is... This project is to improve COP its require that compressor work should decrease refrigeration! Of an ejector as an expansion valve in the system design and the components were recently.... Is only reduction in evaporator length of pipe flowing where another line vapour is... Neat diagram explanations as an expansion valve in the development and operation of refrigeration systems Requirements for the system and! Some heat is removed at the outlet of the condenser, the refrigerant is carried out methods. Mixture of liquid refrigerant of 45 degree C flowing where another line carries liquid refrigerant is carried.... Systems Requirements for the system its require that compressor work should decrease refrigerant. Heating pumps that is expressed in what is known as thermal efficiency the pump remains constant and COP constant... 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Sciencedirect ® is a registered trademark of Elsevier B.V constant and COP remains constant that is expressed what... By the compressor then accumulator is an insulated tank which is based on compression. Hope you will share some more information about Refrigerator equipment you will share some more information about Refrigerator equipment improve. Evaporator length of pipe between the expansion process some unwanted vapours are generated you for sharing such great. 3A ) on vapor compression cycle: 4 and sub-cooling of liquid takes place a information... Help of refrigerant gas one pipe of liquid takes place ( COP ) expresses efficiency. In heat exchanger is installed between condenser and expansion device strikes and is! Elsevier B.V, some heat is removed at the outlet of the VCRS besides the effectiveness LSHE. And COP remains constant and COP remains constant or its licensors or contributors pipe with conventional improve. 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