潤滑油混合下でのCFC12およびHFC134aの蒸発熱伝達と潤滑油の挙動

概要

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Experiments have been performed on the evaporation performance of the refrigerant-oil mixtures inside a smooth tube for CFC12 and HFC134a. Two kinds of oil were used: mineral oil for CFC12 and HFC134a, which was not miscible with HFC134a, and synthetic oil for HFC134a, which was miscible with HFC134a. The straight, horizontal test section, 11.8mm id with a length of 1.0m, was heated by an electric heater, and the heat flux was 7.4kW/m^2. The oil mass concentration was 1% for the mineral oil experiments and 0.1, 0.2, 0.8% for the synthetic oil at the exit of the condenser. The evaporation temperature was about 0℃, and qualities at the measuring point of the heat transfer coefficients changed from about 0.3 to 1.0. Measurements and observations showed clearly the effects of oil miscibility and oil concentration on the flow patterns and heat transfer.
一般社団法人日本機械学会の論文
1992-02-25