深井灌用过程中水温及蓄热量计算

深井冬灌夏用,利用地下含水砂层进行蓄热虽已有多年历史,但对其蓄热效率及灌回水温度的理论计算方法尚感不足。本文提出一个较为简化的计算模型,在不考虑地下水流失条件下求解蓄热效率和灌用水温度之间的关系。文中导出冬季灌水过程中地下含水砂层的温度场和夏季抽用水温度变量的基本方程。在此基础上又进一步提出实用计算方法来求解连续三年在冬灌结束、夏用开始时和冬灌开始时地下砂层的温度分布,以及夏用时的抽用水温度。并引倒说明此方法的计算结果基本符合实际运行中测得的数据。

CALCULATION OF WATER TEMPERATURE AND THERMAL ENERGY STORAGE IN DEEP WELL FILLING AND PUMPING PROCESS

Although the underground aquifer has been utilized as a thermal energy storage in winterfilling and summer pumping of deep well for a long period,the theoretical calculating methodfor storage efficiency and temperatures of filling water are still imcomplete.In this paper,asimplified mathematical model is suggested to find the relation between water temperaturesand heat storage efficiency on condition that no loss of cool water exists in the aquifer.First,the fundamental equations of temperature field of aquifer during the process of winter fillingand water temperature variation in summer pumping are derived.In addition,a practicalcalculating method is introduced to solve the problem of temperature distribution in aquiferat the end of three years' winter filling,at the beginning of three years' winter filling andsummer pumping as well as temperatures of pumped water for three years during the periodof summer sumping.From the illustrative example quoted in this paper,its solutions coin-cide basically with the operating data in practice.