热泵型空调机组室外机制冷剂侧的换热与流动

Heat Exchange and Fluid of Refrigerant in Heat-Pump Air Conditioner

对以R22为工质的热泵型空调机组室外机的换热性能及其对机组性能系数的影响进行了试验研究和实例分析，结果表明：制冷剂在室外机内的相变过程均为非定温过程，但温度变化较小，仅为0．5℃，且室外机供热时作为蒸发器的压降约为制冷时作为冷凝器的压降的3—5倍．当室外机换热面积远大于室内机换热面积、制冷工况下室外机换热面积减小20％时，冷凝器换热量仅减小5．75％，COP仅减小4．00％；在制热工况下室外机换热面积减小20％时，蒸发器换热量仅减小3．75％，供热系数仅减小2．25％．

The heat exchange performance of the outdoor unit and its effect on the COP of a heat-pump air conditioner with R22 as the refrigerant were tested and practically investigated. The results show that （ 1 ） the phase change of the refrigerant in the outdoor unit is an inconstant temperature process with a slight temperature variation of less than 0. 5℃ ; （2） the refrigerant pressure drop of the outdoor unit in heating condition is 3 - 5 times that in refrigerating condition; and （3） when the heat exchange area of the outdoor unit is larger than that of the indoor unit and when the outdoor unit area decreases by 20%, the heat exchange quantum of the condenser decreases only by 5.75% and the COP of air conditioner decreases by 4. 00% at an outdoor unit area decrease of 20% in refrigerating condition. However, in heating condition, the decreases of the two items respectively change into 3.75% and 2.25 %.