空气源热泵误除霜特性的实验研究

Experiment on characteristics of an air source heat pump in false defrosting

对比分析了误除霜和正常除霜时压缩机的轴功率和吸、排气压力等除霜特性参数的变化,发现误除霜时压缩机轴功率高和排气压力高的根本原因是室外换热器表面无霜和室外风机停机。分析了目前分体热泵型房间空调器常用的除霜控制方法——室内侧换热器双温度传感器法的工作原理及其在消除误除霜方面存在的缺陷。

For a split type air source heat pump, compares and analyses variation of the parameters such as compressor shaft power, suction and discharge pressures under normal defrosting and false defrosting conditions. Finds that the causes for over high shaft power and discharge pressure of the compressor are no frost on the surface of the outdoor heat exchanger and stopping of the outdoor fan. Presents the principle of the currently-used defrosting control method with two temperature sensors set in indoor heat exchanger and analyses its shortage.