摘要
为了改进竖直埋管岩土换热器型式的换热性能,提出减小换热器热阻的结构改进设计方案,由三根进水管和一根较大管径的保温出水管构成.推导了结构改进后的换热器热阻理论计算式,计算结果表明,改进后换热器的热阻值比单U和双U型明显减小.在深度约96 m的钻孔内对改进型换热器和单U型、双U型换热器进行了多组加载热负荷试验,结果显示：改进后换热器的热阻比单U型减小29%-34%,比双U型减小10%-15%;系统循环水温升比双U型平均小1.5℃,换热性能有较明显提高.
Based on the deficiencies of existing ground heat exchangers,a new type energy-storage heat exchanger is proposed,which consists of three inlet pipes and one thermal insulation outlet pipe. Thermal resistance of this new type heat exchanger is calculated,which shows a much smaller value over conventional ones. Experimental measurements to evaluate the performance of single-U,double-U and the new design,were carried out in boreholes about 96 meters deep,which showed superior performance of the new type. The thermal resistance of the new type was 29%-34% and 10%-15% smaller than that of single-U and double-U respectively. The circulation water temperature rise of new type was 1.5 ℃ lower than double-U.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2015年第2期92-97,共6页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(51178482)
关键词
地埋管换热器
土壤源热泵
热阻
温升
underground heat exchangers
GSHP
thermal resistance
temperature rise
