【作者】 余乐渊；

【导师】 赵军；

【作者基本信息】 天津大学 ， 热能工程， 2004， 硕士

【摘要】 地源热泵系统由于其高效、节能、环保的特性，近年来日益得到人们的重视和推广。本文着眼于地源热泵U型埋管换热器的传热性能研究，针对U型埋管换热器的传热特点，将其传热过程处理为深度方向上的一维传热和水平面上的二维传热，建立了传热模型。在水平面上的二维传热计算中，分别对U型埋管的两支管脚的传热方程进行了离散化处理，采用数值计算方法，编制了计算机程序，最后采用迭加原理得到了U型埋管的总体传热结果。并对U型埋管换热器的传热性能进行了研究，通过计算得到了不同土壤物性、地埋换热器内循环水流量、回填物导热系数、U型埋管管脚间距对地埋换热器的传热性能及土壤温度场的影响。此外，本文对地埋换热器的设计提出了改进的建议。在理论研究的基础上，结合梅江生态小区综合办公楼地源热泵系统，进行了冬、夏两季供热空调实验研究，得到了地源热泵U型埋管的传热性能参数、U型埋管周围土壤温度场变化规律及地源热泵系统循环性能，并将实验结果与理论分析进行了比较，验证了模型的正确性。本文对梅江生态小区综合办公楼的夏季冷负荷进行了计算与分析，并与实验结果进行了比较，证明了地源热泵系统能够满足用户需求，具有更大规模应用的前景。更多还原

【Abstract】 Due to its high efficiency and energy saving, the benefits of Ground Source Heat Pump(GSHP) is gradually recognized by people. Based on its performance of heat transfer, research is carried on the U-type underground heat exchangers. And the theoretical model, which is composed of one-dimension heat transfer equation in the vertical direction and two-dimension heat transfer equation in the horizontal direction, is established to describe the heat transfer between the underground heat exchangers and soil. During the calculation of two-dimension heat transfer, each polar coordinate is set up to generate numerical grids for each of two legs of vertical ground loop heat exchangers, calculate each one, and then synthesize the two results to obtain the influence of the two. In addition, investigation is carried on performance of heat transfer among the U-type underground heat pumps. Through calculation and analysis, effects of different kinds of soil, various flux in underground heat exchangers, thermal conductivities and distance between two legs on the heat transfer of underground heat exchangers are discussed.Based on the research, experiments are carried on GSHP at Meijiang District in Tianjin in summer and winter. Finally comparisons are made between the theoretical results and experimental ones. And the validation of theoretical model is evaluated. Meanwhile, the cooling load of the GSHP at Meijiang in summer is calculated and analyzed. And the comparisons show that the GSHP are an efficient and effect means for buildings.更多还原