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本文阐述了基于相变蓄热的空气源热泵蓄能除霜系统及其相变蓄热器的设计,提出了3种蓄热模式并搭建了空气源热泵蓄能除霜试验台。通过对实验数据进行分析,认为串联蓄热模式时,系统可有效完成蓄热且相变蓄热器的蓄热速度较快;单独蓄热模式和并联蓄热模式时系统不能有效运行,压缩机的吸、排气温度偏高,而吸、排气压力偏低,功率偏低,相变材料蓄热速度非常小;除霜时,相变蓄能除霜系统的压缩机吸气压力比传统除霜系统提高了约0.3 MPa,有效提高了除霜速度(比传统除霜系统快了近4 min),且系统由除霜模式转为供热模式时,室内机吹出的空气温度较高,更加有利于供热房间的舒适性。
In this paper, the design of air-source heat pump storage defrosting system and phase-change heat accumulator based on phase-change thermal storage are described. Three kinds of thermal storage modes are proposed and the air-source heat pump storage defrosting test bench is set up. Through the analysis of the experimental data, it is considered that the system can effectively complete the heat storage and the heat storage rate of the phase change heat accumulator is faster when the series heat storage mode is adopted; the system can not operate effectively when the single heat storage mode and the parallel heat storage mode are used; Of the suction and exhaust temperature is high, while the suction and exhaust pressure is low, low power, phase change material heat storage rate is very small; defrosting phase change energy storage defrosting compressor suction pressure ratio than the traditional The defrosting system is increased by about 0.3 MPa, the defrosting speed is effectively increased (nearly 4 min faster than the conventional defrosting system), and when the system is switched from the defrosting mode to the heating mode, the temperature of the air blown out by the indoor unit is higher, More conducive to the comfort of the heating room.