地埋管地源热泵系统跨季节土壤蓄热特性的模拟分析
首发时间:2008-06-11
摘要:本文研究了跨季节蓄热地源热泵系统(GCHPSS)土壤蓄热体温度场的变化规律,编写VB程序对地下埋管土壤介质跨季节蓄热进行了模拟,计算结果表明:当采用单U型竖直埋管蓄热时,土壤日蓄热量、热作用半径和平均蓄热率在初始阶段急剧变化,然后缓慢减小并最后趋于稳定,蓄热量也趋于平衡;当采用竖直埋管管群蓄热时,蓄热系统运行1个循环周期(1年)后,土壤的温度场基本上可以恢复平衡,恢复后温度较蓄热开始时初始温度升高约0.5℃。同时,对3种具有不同热物性的土壤蓄热特性进行比较,得出粘土是一种性能良好的长期储能介质。地下埋管土壤蓄热特性的理论研究和模拟分析为GCHPSS系统的长期稳定运行和推广应用奠定理论依据。
关键词: 地源热泵系统 跨季节蓄热 土壤蓄热 地埋管换热器 温度场分布
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Numerical Analysis on Underground Soil Heat Storage Performance of Ground-Coupled Heat Pump System with Seasonal Storage
Abstract:The temperature distribution of soil heat storage was analyzed in ground coupled heat pump with seasonal storage (GCHPSS). Computer program with Visual Basic was developed to simulate the underground borehole heat storage performance. The simulation results show the thermal characteristic of the heat storage quantity per day, thermal influenced radius, average heat storage efficiency and the soil temperature distribution in the single U-tube borehole heat storage and U-tube boreholes heat storage modes. It has also been demonstrated that clay is a kind of better heat storage media with optimum long-term performance. The thermal simulation provides theoretical foundation for regular operation and practical applications of the GCHPSS system.
Keywords: ground coupled heat pump system(GCHPs) seasonal thermal energy storage(STES) soil heat storage borehole heat exchanger(BHE) temperature field distribution
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地埋管地源热泵系统跨季节土壤蓄热特性的模拟分析
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