Heat Transfer Modeling of the Ground Heat Exchangers for the Ground-Coupled Heat Pump Systems
Heat Transfer Modeling of the Ground Heat Exchangers for the Ground-Coupled Heat Pump Systems
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DOI：
10.5772/38890
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发表时间：
2012-05
期刊：
影响因子：
--
通讯作者：
M. Yi;Cui Ping;Fang Zhaohong
中科院分区：
文献类型：
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作者：
M. Yi;Cui Ping;Fang Zhaohong
土壤耦合热泵（GCHP）系统由于其降低的能量和维护成本而在建筑物中的空间空调中越来越受欢迎。地热热电联产系统的效率本质上高于传统方案，因为它利用全年保持相对稳定温度的地面作为热源/散热器。与传统的空调系统相比，GCHP系统的特点是它的地下换热器（GHE），无论是水平安装在沟槽中还是垂直钻孔中的U形管。垂直GHE的优点是，它们需要较小的土地面积，并可以产生最有效的GCHP系统性能。垂直GHE通常通过在垂直钻孔中插入一个或两个高密度聚乙烯U形管来构建，其分别被称为单U形管或双U形管GHE。钻孔应灌浆，以提供更好的导热性，并防止地下水受到可能的污染。钻孔深度通常为40至200米，直径为100至150毫米。在垂直GHE中具有U形管的钻孔的示意图如图1所示。
Ground-coupled heat pump (GCHP) systems have been gaining increasing popularity for space air conditioning in buildings due to their reduced energy and maintenance costs. The efficiency of GCHP systems is inherently higher than that of the traditional options because it utilizes the ground which maintains a relatively stable temperature all the year round as a heat source/sink. Compared with traditional air-conditioning systems, the GCHP system features its ground heat exchanger (GHE), whether it is horizontally installed in trenches or as U-tubes in vertical boreholes. The advantages of vertical GHEs are that they require smaller plots of land areas, and can yield the most efficient GCHP system performance. The vertical GHEs are usually constructed by inserting one or two high-density polyethylene Utubes in vertical boreholes, which are referred to as single U-tube or double U-tube GHEs, respectively. The boreholes should be grouted to provide better thermal conductance and prevent groundwater from possible contamination. Borehole depths usually range from 40 to 200 meters with diameter of 100 to 150 millimeters. The schematic diagram of a borehole with U-tubes in vertical GHEs is illustrated in Fig. 1.