EFFECT OF CIRCUIT NUMBER ON INDOOR COIL SERVING AS BOTH CONDENSER AND EVAPORATOR IN A HEAT PUMP
The effect of the circuit number on the indoor coil in a split-type air-source heat pump was studied numerically by EVAP-COND 2.0 version simulation package of American NIST. The indoor coil serves as an evaporator in a cooling cycle and as a condenser in a heating cycle. The air-and-refrigerant temperature difference increases with the circuit number, but the overall heat transfer coefficient drops. The evaporator capacity rises firstly, and then drops with the circuit number and achieves the maximum value at the optimum circuit number. The minimum evaporator capacity is less by 23.2％ than the maximum. The air-and-refrigerant temperature difference and the overall heat transfer coefficient are the dominant factors governing the evaporator capacity, respectively, behind and beyond the optimum circuit number. The condenser capacity always decreases with the circuit number and the overall heat transfer coefficient acts as the dominant factor. The minimum condenser capacity is less by 40.5％ than the maximum. These results demonstrate that the indoor coil in a heat pump is endowed with an optimal circuit number to increase the efficiencies and capacity in heating and cooling cycles simultaneously.
circuit number performance condenser evaporator heat pump
Dong HUANG Xiuling YUAN
Xian Jiaotong University, Institute of Refrigerating and Cryogenic Engineering,Xian 710049, P.R.China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）