垂直U形地埋管换热器长度计算方法研究

Calculation Method of Vertical U-tube Geothermal Heat Exchanger Length

地埋管换热器是地埋管地源热泵系统的核心组件,但至今其长度计算尚无一种便捷、正确又易于应用的方法。用典型气象年数据确定最热月、最冷月和地表面年平均温度。在已知建筑物设计负荷情况下,通过引入平衡温度的概念,可计算建筑物逐时负荷,再由建筑物逐时负荷和水源热泵机组性能计算出制冷与制热运行系数。最后提出了一种实用且操作性强的垂直U形地埋管换热器长度计算方法。

Geothermal Heat Exchanger is a key component in Ground-Coupled Heat Pump systems, but a length calculation method of convenient, correct and suitable for applications does not exist. In our research, Typical Meteorological Year data were used to determine the hottest month, the coldest month and annual average surface temperature. When the building load is known, the building hourly load can be obtained by adopting the concept of Equilibrium Temperature. Then, the cooling fraction and the heating fraction can be calculated. A more practical and workable calculation method of vertical U-tube heat exchanger length was proposed.