Research on heating and defrosting performance of phase-change energy storage air source heat pump system
Aiming at the outstanding problems such as poor low-temperature heating performance,slow defrosting and high energy consumption of conventional air-source heat pumps,a phase-change energy storage air-source heat pump system was proposed and designed,and its heating and defrosting performance was investigated through experiments.The results show that,when the outdoor and indoor dry/wet bulb temperatures are 2 ℃/1 ℃ and 20 ℃/12 ℃ respectively,compared with the conven-tional air source heat pump system,the average heating capacity of the system is increased by 11.87％,the average COP is in-creased by 11.46％,and the total energy storage reaches 1 042.91 kJ.When defrosting mode,compared with the conventional reverse defrosting,the defrosting time of this system is shortened by 20.83％,the defrosting energy consumption is reduced by 15％,and it does not draw heat from the indoor side and consume additional energy,so the defrosting and energy saving effect is very significant.This study can provide some reference value for improving the heating performance and defrosting efficiency of air source heat pumps.
Air sourceHeat pumpPhase change energy storageHeatingDefrosting
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