相变蓄热蒸发型空气源热泵性能优化实验研究

EXPERIMENTAL STUDY OF PERFORMANCE OPTIMIZATION OF PHASE CHANGE HEAT STORAGE EVAPORATOR TYPE AIR-SOURCE HEAT PUMP

通过在蓄热器盘管上加装矩形翅片及采用新型相变蓄热材料(80%Na_2SO_4?10H_2O+20%Na_2HPO_4?12H_2O),对原开发的蓄热蒸发型空气源热泵系统实施优化改造。改造后的实验结果显示:系统优化后,蓄热器的蓄热速度增加了近一倍,蓄热时间缩短55%;平均放热时间较优化前增加了40%;热泵在超低环境温度-30℃下运行,排气温度也仅为103℃,低于安全排气温度极限130℃;环境温度-30℃时的系统制热量增加了1.1 k W,增加比例23.4%;环境温度-30℃时,热泵供热系数COP为1.8,较优化前的1.6提高12.5%。

The heat storage evaporator air source heat pump was optimized and reformed by installing rectangular fins on tube of heat accumulator and applying the new type phase change heat storage material （80%Na2SO4·10H2O ＋20% Na2HPO4·12H2O）. The experimental results show that the heat storage rate of the heat accumulator is nearly doubled and the heat storage time is shortened by 55% after the system optimization. The average heat release time is 40% higher than that before the optimization. Even the system is operating under the ultra-low temperature of-30℃, the exhaust temperature of the compressor is only 103℃, it is below the safe limit temperature ; at low ambient temperatures of-30℃, the heating capacity of the system increases 1.1 kW, and the increasing ratio is 23.4% ; at low ambient temperatures of -30℃, the COP for heat pump is increased by 12.5% from 1.6 to 1.8 after optimization.