地埋管换热器变热流工况下换热模型及其试验验证  

Heat transfer model of ground heat exchanger under variable heat flux and its experimental verification

作　　者：昂超[1] 贾新龙[1] 唐永强[1] 于国清[1] 

机构地区：[1]上海理工大学

出　　处：《制冷与空调》2014年第2期41-44,共4页Refrigeration and Air-Conditioning

摘　　要：地埋管换热器实际运行时,热流总是变化的。为了研究变热流模型的正确性,本文讨论变热流下叠加原理在无限长线热源模型中的应用,以及此模型下地埋管换热器进出口水温的理论解。先保证热流恒定,对上海市某别墅地源热泵项目进行现场实测,将测试得到的相关参数作为已知。待岩土温度恢复到初始值时,进行变热流试验,通过变热流模型计算的进出口水温与实测的进出口水温比较,相对误差基本小于2%,最大误差不超过3%。The heat flux of the ground heat exchanger changes all the time during oper- ation. In order to verify the validity of variable heat flux model, the application of superpo- sition principle under variable heat flux in infinite line-heat-resource model is discussed. And the theoretical calculation of the inlet and outlet water temperature of ground heat ex- changer is also obtained by this model. One ground source heat pump system located in Shanghai is tested under the constant heat flux, the testing parameters are used as input. The inlet and outlet water temperature are measured again at variable heat flux once the soil temperature restored to the initial value and compared with the calculated values. The results show that the relative deviation is less than 2 ~ and the maximum deviation is less than 3 ~//0.

关 键 词：地埋管换热器 叠加原理 变热流 试验验证 

分 类 号：TK172[动力工程及工程热物理—热能工程]