冷凝器流程数和放置形式对热泵空调系统制冷性能的影响

Effects of Condenser Flow Number and Placement Form on Refrigeration Performance of Heat Pump Air Conditioning System

为揭示冷凝器流程数和放置形式对热泵空调系统制冷性能的影响,课题组设计了热泵空调系统制冷实验。通过实验研究了不同流程数和放置形式的冷凝器对系统制冷量、能效比R_(EE)和出风温度等参数的影响;通过红外热像仪记录了冷凝器表面温度分布特性,并采用Otsu算法分析了冷凝器高温区域面积占比。研究结果表明:二流程倒置较其他布置方案有更大的制冷量,更高的R_(EE)值以及更低的出风温度;二流程布置方案较三流程有较低的冷凝压力,较低的压比以及较小的压缩机进出口比功;不同流程、不同放置形式的微通道冷凝器,其表面温度分布有差异,二流程较三流程温度分布均匀性好;二流程倒置时高温面积占比大,压缩机转速为4000 r/min时,冷凝器高温区域占比达62.1%。选用倒置形式的二流程微通道换热器作为冷凝器,可有效提升热泵空调系统制冷效果。

In order to reveal the influence of condenser flow path number and placement form on the refrigeration performance of heat pump air conditioning system,a refrigeration experiment of heat pump air conditioning system was designed.Through experimental tests,the effects of condensers with different flow path numbers and placement forms on the refrigeration capacity,energy efficiency ratio,outlet air temperature and other parameters of the system were studied.The surface temperature distribution characteristics of condenser were recorded by infrared thermal imager,and the area proportion of high temperature area of condenser was analyzed by Otsu algorithm.The results show that compared with other layout schemes,the two-flow condenser inverted form has larger refrigeration capacity,higher energy efficiency ratio and lower air outlet temperature.Compared with the three-flow condenser,the two-flow condenser has lower condensing pressure,lower pressure ratio and less compressor power consumption.The surface temperature distribution of micro-channel condenser with different flow numbers and different placement forms is different.The temperature distribution uniformity of the two-flow condenser is better than that of the three-flow condenser.When the two-flow condenser is inverted,the high-temperature area accounts for a large proportion.At a compressor speed of 4000 r/min,the high-temperature area of the condenser accounts for 62.1%.The cooling effect of heat pump air conditioning system can be effectively improved by selecting an inverted two-flow micro-channel heat exchanger as the condenser.