不同方式地下埋管换热器的实验研究

Experimental Research on Different Types of Underground Heat Exchangers

针对不同方式地下埋管换热器建立实验系统 ,并分别对砂石回填的单U型和双U型井埋管进行夏季排热和冬季取热实验。整理分析了冬、夏季节不同运行工况下的实验数据 ,在此基础上 ,以单位管长换热量为评价指标对不同埋管方式的换热性能进行分析比较 ,得出排热工况和取热工况下 ,单U型埋管单位管长换热量高于双U型。同时对埋管换热器的流量和进口水温对其换热性能的影响进行了研究 ,结果表明 ,随着流量的增大 ,排热工况与取热工况下 ,单位管长换热量均增加 ;随着进口水温的升高 ,单位管长排热量增大 。

The experiments on different underground exchangers were carried out to research their exchange performance. The experimental datum on heat extraction and heat rejection of single U and double U models vertical underground pipes was analyzed using heat exchange capacity of unit pipe. The conclusion is that single U models vertical underground pipes is better than double U models. The influence of the flux and the temperature on exchange performance was investigated. The results show that the heat exchange capacity increase when the flux increase; The heat rejection increase and heat extraction decrease when the temperature increase.