复叠式空气源热泵相变蓄能除霜能耗实验研究
Experimental Study on the Defrosting Energy Consumption of Cascade Air-source Heat Pump with Phase-change Energy Storage for Defrosting

本文研究了复叠式空气源热泵在相变蓄能除霜过程中，除霜能量的来源和能耗的分配。通过选取室外温度-9 ℃，相对湿度85%，结霜量为1.5 kg的工况进行相变蓄能除霜能耗实验研究，结果表明：除霜能量主要用于融化霜层、蒸发壁面滞留水、加热室外换热器盘管、与室外空气的热交换以及加热融化水，各部分占比分别为15.7%，15.0%，23.4%，38.0%和7.9%。除霜过程中，除霜能量主要来自蓄热器向低温级释放的热量、除霜前储存在系统中的热量以及低温级压缩机提供的热量，各部分占比分别为45.2%，30.4%，24.4%。
This study explores the energy consumption during the defrosting process of a cascade air-source heat pump with phase-change energy storage for defrosting and from where it comes. Experiments are carried out at an outdoor temperature of ?9 ℃, relative humidity of 85%, and frosting volume of 1.5 kg. The experimental results show that the defrosting energy is mainly used in melting the frost layer, vaporizing the retained water, heating the fins and coils of evaporator, heat transfer with the ambient air, and heating the melted water. The proportion of each part is 15.7%, 15.0%, 23.4%, 38.0%, and 7.9%, respectively. During the defrosting, the defrosting energy mainly comes from the heat released from the thermal accumulator to the lower pressure stage, heat stored in the system before defrosting, and heat provided by the compressor at lower pressure stage. The proportion of each source is 45.2%, 30.4%, and 24.4%, respectively