相变蓄热蒸发型空气源热泵性能实验研究

EXPERIMENTAL STUDY ON THE PERFORMANCE OF THE ASHP WITH PHASE CHANGE HEAT STORAGE EVAPORATOR

针对北方低温环境下空气源热泵性能低劣的状况,开发设计一种相变蓄热蒸发型空气源热泵系统,相变蓄热器由蓄热材料、双盘管和保温层组成,该热泵系统可在供热-蓄热、供热-放热和除霜-放热模式下运行。通过人工模拟各种不同环境温度对该热泵系统的不同运行模式进行性能测试。测试结果显示:相变蓄热蒸发型空气源热泵系统在3种模式下都具有优良的性能,在超低环境温度-25℃和-30℃下运行时,制热性能系数COP分别为2.00和1.94,制热量仍能满足供热需求,同时压缩机排汽温度显著降低。实验研究结果表明,该相变蓄热蒸发型空气源热泵系统能够解决空气源热泵在供热过程中存在的能量供需矛盾,同时可提高空气源热泵在低温运行下的各种性能。

For the poor performance of ASHP in the northern low-temperature environment, a new ASHP system with phase change heat storage evaporator has been developed. The phase change heat storage evaporator is consisted of phase change material, the double coil tube and thermal insulator. The ASHP system can be run in three modes： heating-heat storage, heating-heat release and defrostering-heat release. Through simulating the ambient temperature artificially, the performances of the ASHP in the three operating modes are carried out. The experimental results showed that the new ASHP system has excellent performance in the three operating modes, the heating COP of the system are 2.0 and 1.94 respectively in the ultra-low -25 ℃ and -30 ℃ temperature, and the heating capacity of the ASHP can meet the heating needs even in the ultra-low -30 ℃ temperature, the exhaust temperature of the compressor reduce significantly. The experimental results indicate that the new ASHP system with phase change heat storage evaporator can solve the contradiction between supply and demand of energy in the heating process , and can improve the performance of the ASHP in low-temperature greatly.