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Experiments on Expansion and Superheat Processes of a Co 2 Cycle Using Microchannel Evaporator

Experiments on expansion and superheat processes of a transcritical CO2 air conditioning system were done. In this study, the cross-sectional area of the expansion valve reduces from 8.195 to 0.091mm2, the cooler pressure increases and the evaporator pressure decreases; the pressure difference between cooler and evaporator increases. Besides, the power input of compressor increases as decreasing the crosssectional area.It is also observed that the pressure difference and power input strongly increase as the crosssectional area is less than 0.4 mm2.The cooler pressure curve and the power input curve are the same rule as varying the cross-sectional area. Moreover, the evaporating temperature decreases from 18.4 to 7.3 C and the superheat decreases from 3.4 to 1.1 C as the cross-sectional area reduces from 3.825 to 0.091 mm2 . Inaddition, the cooling capacity of this cycle is 168.45 kJ/kg, the compressor power is 23.99 kJ/kg, resulting the COP is 7.01; the COP is higher than those obtained from other literature reviews

Từ khóa: Experiment, CO 2 refrigerant, expansion, superheat, evaporator, microchannel

25 p ovanketv 01/06/2018 540 2

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