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An Experimental Study on Heat Transfer Characteristics of Refrigerant R134a in a Microtube Evaporator

The heat transfer characteristics of a microtube evaporator use refrigerant R134a were studied experimentally. This evaporator was made from copper tubes and aluminum foils with overall
dimensions (L*W*H) of 259.3*43*200mm. The evaporator has 10 passes, each pass including 8 copper pipes (with hydraulic diameter of 0.82mm) and 83 aluminum foils (with the thickness of 0.3 mm); the distance between the two foils is 2.6 mm. The
experiment was conducted based on the same heat transfer area and overall dimensions a conventional evaporator (macro evaporator). In this study, the heat flux increases with increasing
air flow rate of the evaporator at an inlet air temperature of 30 oC. Besides, the cooling capacity and the COP of the micro tube evaporator are also presented in this study.

Từ khóa: Experimental Study, Heat Transfer, R134a, MultiMicro Tubes, Evaporator.

6 p ovanketv 09/01/2020 308 2

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