不同负荷单井循环地下水源热泵系统实验

Experimental research on single well groundwater heat pump systems in building load variations

摘要:

针对单井循环地下水源热泵系统,搭建了物理模拟砂箱实验台研究其地下水流动和换热规律,并开展了负荷变化的实验研究．结果表明: 相同实验条件下,循环单井的取热量仅为抽灌同井的50.3％,填砾同井的45.9％,其径向热影响范围小于186.5 mm;而当抽水流量从0.54 m³／h降低到0.315 m³／h时,循环单井、抽灌同井、填砾同井的取热量分别降低了51.0％、31.6％和19.5％．可见循环单井承担负荷的能力最差,但抽水流量的变化对循环单井的影响更大;提高抽水流量能够显著提高热源井的取热量,增大热影响范围,从而提高热源井承担负荷的能力．

Abstract:

Because of insufficient research on single well groundwater heat pump systems, a physical simulation experiment table has been set up to study the flow and heat transfer law in these systems. Experimental research on building load variations has been carried out. The results show that in the same experimental conditions the absorption quantities of standing column well (SCW) are only 50.3％ and 45.9％ of pumping and recharging well (PRW) and pumping and recharging well filled with gravel (PRWFG) respectively. In addition, the radial thermal influence scope of SCW is less than 186.5 mm. However, the heat absorption quantities of SCW, PRW and PRWFG reduce to 51.0％, 31.6％ and 19.5％ individually, when the flow rate of outlet water drop from 0.54 m³／h to 0.315 m³／h. Thereby the load capacity of SCW is the least one in these three systems. However, the variation of the flow rate of outlet water can impact on SCW more significantly. It is more obvious that increasing the flow rate of the outlet water can improve the load capacity and the thermal influence scope of the thermal source wells. Thus, the load capacity of thermal source wells can be increased.