地埋管地源热泵水平埋管冬夏季工况换热性能及土壤温度场
Heat transfer performance and temperature field of soil around horizontal buried heat exchangers for ground-coupled heat pump system
摘要：
建立了水平埋管的二维数学模型，使用边界离散、保形变换方法对模型进行求解，用VB编制了地埋管地源热泵水平埋管土壤温度场计算软件。运用模型和软件，详细模拟了冬季和夏季工况下水平埋管及其周围土壤温度场和热流分布规律。冬季水平埋管周围土壤温度纵向呈不对称单峰状分布，横向呈完全对称的单峰状分布。夏季水平埋管周围土壤温度纵向呈不对称单谷状分布，横向呈完全对称的单谷状分布。随着位置远离埋管，土壤温度变化幅度减小。埋管外表面温度分布和土壤沿与埋管同圆心的圆周上温度分布都呈正弦曲线。埋管上部各单元的热流量相对较高，下部各单元的热流量相对较低。求解了给定工况下水平埋管的单位管长换热量，并通过文献中的实验数据对算法进行了验证，误差为6.2％，模型算法具有可靠性。
Abstract：
Presents a new two-dimension model, solved by the boundary discrimination and conformal mapping methods, and compiles the calculating software by Microsoft Visual Basic language. By the model and software, simulates the temperature field and the heat flow distribution for horizontal buried pipes of the heat exchanger for the GSHP in winter and summer conditions. The temperature field around the pipe shows a single-peak asymmetrical profile on vertical plant and a single-peak symmetrical profile on horizontal plant in winter condition, and shows a single-hollow asymmetrical profile on vertical plant and a single-hollow symmetrical profile on horizontal plant in summer condition. The soil temperature varies slightly increasingly away from the buried pipes. The temperature for the outer surface of the pipe and for the concentric circle with the pipe all show sine profile. The heat flow is higher through the top units of the pipe than that through the bottom units. The results agree with the data in the experiments reported by Chongqing University, and the residual error is 6.2％.
Keywords:ground-coupledheatpump,horizontalburiedpipe,temperaturefield