Experimental Research on Different Types of Underground Heat Exchangers[J]. Journal of refrigeration, 2004, 25(2): 39-42. DOI: 10.3969/j.issn.0253-4339.2004.02.009.
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.