单井循环系统在不同初始地温下的特性

摘要

Because of insufficient research on single well groundwater heat pump systems , an experimental table for a physical simulation has been set up in order to study the flow and heat transfer law in these systems .Experimental research of initial aquifer temperature variations has been carried out .The results show that among the three single well systems, the standing column system's temperature variation between the inlet and outlet water is the maxi-mum, while its thermal influence scope is the minimum , and its load capacity is the lowest .When the initial aquifer temperature is 20℃in the heating mode , the heat transfer quantities of the pumping and recharging well system and the pumping and recharging well system filled with gravel are 2.0 and 2.2 times respectively with the standing col-umn well system .Moreover , the percentage of heat absorption change is greater than that of heat rejection change when the initial aquifer temperature changes to the same extent in the three single well systems .Therefore, initial aquifer temperature changes in heating mode should be paid attention in the heating dominated area .%针对单井循环地下水源热泵系统的研究不足，搭建了物理模拟砂箱实验台研究单井循环地下水源热泵系统地下水流动和换热规律，并开展了初始地温变化的实验研究。结果表明：3种热源井中循环单井抽回水温度变化最大，热影响范围最小，承担负荷的能力最低。在初始地温为20℃、取热工况下，抽灌同井、填砾同井的换热量分别为循环单井的2．0倍和2．2倍。含水层温度变化相同温度时，3种热源井取热量变化的百分比均大于放热量的变化。因此，在以供热为主的地区，应注意初始地温变化对取热工况的影响。