摘要
R134a and R152a are two promising refrigerants to replace R12 that depletes the ozone layer. This paper presents how to determine the charge accurately when R134a or R152a is used to replace R12 for household refrigerators. A lot of experiments are done on a household refrigerator in order to choose a correct void fraction correlation for density calculations in two phase region. For HFC 152a, Hughmark model is fairly accurate, whose error is -6.0% or so. For HFC 134a, both Tandon model and Premoli model can get good results, their errors are around -1.8%, -2.4% respectively.
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基金
the Fund of Natural Science of China,the Fund for
