A study of seasonal heart storage in the earth ground as heat source of heat pump

在本研究中，处理了每年在地下储存的热量。蓄热系统由闭式热井组成，假定作为热泵的热源。为了分析这些系统的蓄热过程，本文建立了一个数学模型，将土壤中的热量传递建模为热湿同步传递。应用该模型，可以分析土壤含水量、地下水位和地表降水的影响。利用该模型对上述实验结果进行了分析，并对模型的有效性进行了讨论。实验研究进行了2年多。该系统由热井、热泵和水循环系统组成。在井的正弦供热（夏季为正供热，冬季为负供热）条件下，连续两年测量井内水温，并测量地表温度和水分势的分布。通过求解数学模型，将实测结果与计算结果进行了比较。他们之间表现出非常好的一致性。采用数学模型给出了设计方法，并进行了说明。提出了冻土冻结和融化过程的数学模型。并给出了数值计算结果。在此基础上，提出了一种将蓄热过程视为随机过程的蓄热优化控制方法。

In this research, a annual heat storage in the earth ground is treated. Asystem of heat storage is composed of closed type thermal well, and assumed to be used as heat source of heat pump. To analyze heat storage process of those system, a mathematical model is presented in this study, in which heat transfer in the earth ground is modeled as simultaneous heat and moisture transfer. By applying the model, effects of moisture in soil, level of water table and precipitation on the earth surface can be analyzed. The model are used to analyze experimental results mentioned bellows and validity of the model are discussed.A experimental study was perfomed over 2 years. The system is composed of a thermal well, heat pump and a water circulation system. Under sinusoidal heat supply (positive during summer and negative during winter) to the well, water temperature in the well were measured over two years, and distributions of temperature and moisture potential in the earth ground were measured. Those measured results are compared with calculated results obtained by solving the mathematical model. They show very good agreement between them. Design method using the mathematical model presented, are shown.Of freezing and melting process in the earth ground, a mathematical model is presented. And numerical calculations are shown. In addition to those, a method of optimum control of heat storage is presented, treated as stochastic process of heat storage process.