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RISS 인기검색어
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- 저자 : A V Sita Rama Raju (검색결과 1 건)
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Optimization Process of a Visi-Cooler Using Ternary Mixtures of R134a and Hydrocarbons
Srinivas Pendyala,Ravi Prattipati,A V Sita Rama Raju 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.2
Ozone depletion and global warming phenomenon necessitates the replacement of widely used refrigerants which consist of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) in refrigeration and air-conditioning systems. In this paper, experimental analysis on the performance of hydrofluorocarbon/hydrocarbon (HFC/HC) mixture as a possible drop-in replacement for R134a refrigerant is presented. The influence of capillary length, composition of the mixture and refrigerant charge at various evaporator temperatures on coefficient of performance (COP) are investigated. The optimum operating conditions are obtained by applying Taguchi technique for the acquired experimental results. The results of analysis of variance indicated that for a given evaporator temperature, HFC/HC mixture charge amount is the most influencing parameter. At the optimum condition, the simulation showed that the amount of charge required for HFC/HC mixture in visi-cooler is 120g which is 50% lower than required quantity of R134a for the same system. The HC mixture quantity amounted to 90g in the HFC/HC mixture which is lower than the safe limit of 150g. This eliminates the risk of flammability of HC in the proposed mixture while reducing the quantity of R134a by 87.5%
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