严寒地区被动房热泵空调机组冬季性能测试与分析

Performance test and analysis of heat pump air conditioning units of a passive house in severe cold zone in winter

由于被动房围护结构具有良好的保温隔热性能,而严寒地区冬季时间长,室内外温差大、比焓差大,因此新风系统能耗在供暖空调系统总能耗中占比较大。本文对严寒地区某被动房的新风系统冬季运行参数进行了测试,对空气源热泵机组在严寒地区的运行效果进行了分析。结果表明:实际运行时,当室内人员较少时,该机组送风温度、送风量均能满足设计标准和舒适度的要求;热泵机组随室外空气温度的降低出现制热量不足的情况,当室外空气温度升高到-7℃时,该机组的性能系数达到了1.87,高于标准下限值要求。建议该机组在室外空气温度高于-7℃时工作。

Because the passive house envelope has good thermal insulation performance,and the winter time in severe cold zone is long,the indoor and outdoor temperature difference is large,and the specific enthalpy difference is large,so the energy consumption of the outdoor air system accounts for a large proportion of the total energy consumption of the heating and air conditioning system.In this paper,the operating parameters of the outdoor air system of a passive house in severe cold zone are tested in winter,and the operation effect of the air-source heat pump unit in the severe cold zone is analysed.The results show that in actual operation,the air supply temperature and air supply volume of the unit can meet the requirements of design standards and comfort when there are few occupants.As the outdoor air temperature decreases,the heating capacity of the heat pump unit is insufficient.When the outdoor air temperature rises to-7℃,the coefficient of performance of the unit reaches 1.87,which is higher than the standard lower limit.The unit is recommended to work when the outdoor air temperature is higher than-7℃.