Because of insufficient research on operational characteristics of pumping and recharging well (PRW),an experimental sandbox of single well cycling ground heat exchanger system has been used.According to the time scale of heating and air conditioning period in Shanghai,two operation modes have been carried out that experimental study on summer and winter (SW) mode & winter and summer (WS) mode.The results show that the aquifer heat loss of this experimental sand box is fast,while the heat discharge of thermal well is relatively easy under the heat release condition.However,it is difficult to extract the heat under absorption condition.In cold load dominated area,to ensure long-term reliable operation of system,assistive technology should be used to sharing the cooling load of the aquifer during the operation of PRW;it is suggested that the system first carries on the operation of the winter heat absorption condition,and the aquifer storage heat is extracted,and then the heat release is carried out in summer.Keep the lower outlet water temperature and raise the coefficient of performance (COP) of heat pump unit.%针对抽灌同井运行特性的研究不足,利用单井循环地下换热系统砂箱实验台,以上海地区的采暖期和空调期的时间尺度为依据,开展了抽灌同井夏冬、冬夏两种运行模式下运行特性的实验研究.结果表明,该砂箱实验台中的含水层热量流失较快,放热工况下热源井排放热量较容易,取热工况下热源井提取热量较困难.抽灌同井在冷负荷占优的地区运行时,需要采用辅助技术手段,分担地下含水层承担的供冷负荷,保证系统长期可靠运行.建议系统先进行冬季取热工况的运行,提取含水层储热量;继而进行夏季排热工况,保持热源井较低的抽水温度,提高热泵机组效率.
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