太阳能应用于土壤源热泵低温热源侧的实验研究

Experimental study on the application of solar energy on the low temperature heat source side of ground source heat pump

为了提升热泵机组的性能系数COP,合理利用不同温度层次的太阳能集热量,文章基于太阳能—土壤源复合热泵系统的大量实验结果,分析了蒸发器进口温度对热泵系统各项性能的影响,并在此基础上,分析了复合源热泵工况和太阳能热泵工况的运行特点。分析结果表明:随着蒸发器进口温度的升高,热泵机组吸热量逐渐增大,热泵机组输入功率略有增加,导致热泵机组的供热量和COP均逐渐增大;复合源热泵工况下,存在土壤源和太阳能共同供热,以及土壤短期储热与太阳能单独供热同时进行的两种运行情况;为了提升热泵机组的工作性能,在太阳能集热量较低时,优先运行复合源热泵工况;土壤源温度的自然恢复能力较差,需要利用太阳能集热系统对土壤源进行跨季强制蓄热,以提高土壤源温度,缓解土壤源冷堆积现象。

Starting from improving the coefficient of performance(COP)of heat pump units and making reasonable use of solar energy at different temperature levels,this article analyzes the impact of evaporator inlet temperature on the performance of the heat pump system based on a large number of experimental results of the solar soil source composite heat pump system.On this basis,the operating characteristics of the composite source heat pump and solar heat pump conditions are analyzed.The analysis results indicate that as the inlet temperature of the evaporator increases,the heat absorption capacity of the heat pump unit gradually increases,and the input power of the heat pump unit slightly increases,leading to a gradual increase in both the heat supply and COP of the heat pump unit;When a composite source heat pump operates,there are two operating scenarios:soil source and solar energy heating together,and short-term soil heat storage and solar energy heating separately.In order to improve the performance of the heat pump unit,when the solar energy collection is low,the composite source heat pump is prioritized for operation;The natural recovery ability of soil source temperature is poor,and it is necessary to use solar energy collection systems to forcibly store heat across seasons to increase soil source temperature and alleviate the phenomenon of"cold accumulation"of soil sources.