文档介绍：土壤源热泵垂直U型埋管换热器传热模型分析研究
刘亮1 胡宁2 王晏平2 李雪飞2 汪志远3
(1合肥烟草设计院 2安徽建筑工业学院 3海尔集团)
摘要: 对地埋管换热器的传热过程进行合理分析是保证地源热泵空调经济可靠运行和降低其初投资的基本要求,传热模型又是传热过程的关键所在,因而确定钻孔内传热模型对于设计地源热泵空调系统中的地热换热器具有重要的意义。在此基础上本文分析了地源热泵地下换热器的三种传热模型,导出了其解析式,并对比分析了各种模型的优缺点,为地下换热器的设计和分析提供了更精确的方法。
关键词:地热热泵系统垂直U型管换热器传热模型热阻
Dicussion on models of vertical U-tube heat
exchanger for ground-source heat pump systems
By Liu Liang1,Hu Ning2 ,Wang Yanping2,Li Xuefei2,Wang zhiyuan3
(1 Hefei Design Institute of o,
2 Anhui University of Architecture,3 Haier Group)
Abstract: The ground source heat pump system features its ground heat exchanger, which contributes to a substantial portion of its initial cost. The heat transfer model is very important, so it is crucial to determine the heat transfer model with higher accuracy for cost-efficient applications of GSHPs. This paper is to analyse three transfer models of the heat transfers of ground-source heat pump and conclude each analytical solution pared with each other, it gives a more accurate method to design and analyse the heat transfers.
Key words: ground- source heat pump systems; vertical U-tube heat exchanger; heat transfer model; thermal resistance
0 引言
地源热泵以地表能为热源(热汇),通过输入少量的高品位能源(如电能),实现低品位热能向高品位热能转移的热泵空调系统。冬季供热时,把地表中的热量“取”出来,供给室内供热,同时向地下蓄存冷量,以备夏用;夏季制冷时,把室内热量取出来,释放到地表中,向地下蓄存热量,以备冬用,因此地源热泵是可再生能源利用技术。地源热泵系统只取热不取水,没有地下水位下降和地面沉降问题,不存在腐蚀和开凿回灌井问题,也不存在对大气排热、排冷的热污染和排烟、尘、水等