寒冷地区空气源热泵与太阳能复合供热系统性能测试分析

Performance test analysis on air source heat pump and solar energy composite heating system in cold area

根据典型用户供暖及热水使用需求,在寒冷地区搭建空气源热泵与太阳能复合供热试验系统,在供热季初中期进行运行测试研究。结果表明:复合供热系统可为北方寒冷地区典型家庭用户提供基本的供暖需求和生活热水使用需求,复合系统在满足2.5~3.6kW供暖负荷的同时,可提供280L以上不低于38℃的生活热水;蓄热水箱内温度对热泵单元的耗电量具有显著影响,且线性相关度较好,水箱平均温度与环境温度之差同热泵运行能效呈现较好的线性变化趋势,温差越大,热泵能效越低,运行中温差范围集中在30~40℃,期间热泵能效处于2.5~3.0;集热单元对于复合系统运行能效的提升也有一定程度的贡献,运行能效相对于热泵单元单独承担热负荷的工况可提升20%以上。

According to the demand of heating and hot water supply for typical users in cold area, one air source heat pump and solar energy composite heating test system is set up, and the operation test study is conducted in the early-middle heating season. The results show that the composite heating system can provide the basic heating demand and domestic hot water demand for the typical household users in the north cold area. This composite system can meet the heating load of 2.5-3.6 kW, at the same time, which can provide domestic hot water above 38℃ of more than 280 L. The temperature of the heat storage water tank has a significant influence on the power consumption of the heat pump unit with a good linear correlation. The temperature difference between the average temperature in heat storage water tank and the ambient temperature has a good linear correla- tion with the coefficient of performance （COP） of the heat pump unit, which means that the greater the temperature difference is, the lower COP of the heat pump unit is. The temperature difference ranges from 30 ℃ to 40 ℃, and the COP varies from 3.0 to 2.5. The heat collection unit also has a certain degree of contribution to the energy efficiency of the composite system, the COP of the composite system can be increased by more than 20% compared with the single heat pump unit.