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A simple model to calculate the defrosting electrical energy input and the ways to optimize the air cooler's electro-thermal defrosting system

WAN Jin-kang1,ZHANG Qing1,2,CAO Guang-rong1,LI Jian-guo1,GONG Hai-hui1(1.Quality Surveillance and Testing Center for Cold Store and Refrigeration Equipment,College of Food Science and Technology,Shanghai Fisheries University, Shanghai 200090,China;2.Institute of Refrigeration Technology,University of Shanghai for Science and Technology,Shanghai 200093,China)  
An easy-to-use mathematical model to calculate the electricity energy input required by the air cooler to defrost is presented in this paper,which reasonably simplified the overall energy input required by the whole air cooler during the defrosting process to that required by the frost film on the tubes and fins.Then the performances of a typical domestic made air cooler and an imported product are compared using the following four indexes: the ratio of the electricity energy input over the surface area of the air cooler,the overall heat transfer coefficient,the ratio of the electricity energy input over the refrigeration capacity of the air cooler and the utility ratio of the defrosting electricity energy input.The comparative analysis shows that the former is inferior to the latter.The causes of these differences are analyzed and the ways to optimize the performance of the domestic made air coolers are illustrated.
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