抽灌同井季节性储能分析

为了探究抽灌同井季节性储能的可能性和潜力,采用经过现场试验验证过的数学模型对抽灌同井常年运行工况进行了数值模拟,并以抽回水温度为基础建立了季节性储能的定量分析模型.结果表明,由于热贯通的存在,前一个运行周期会对后面运行周期的抽水温度产生重大的影响,证实抽灌同井出现了明显的季节性储能现象.当负荷基本平衡时,逐年的抽水平均温度和储能比基本保持不变.对于北京地区夏冬运行模式,此时季节性储能提供了约73%的低位热量和24%的热汇.而当累积负荷不平衡时,热源井的抽水温度出现明显升高或降低,严重时使热源井失效.

Analyses of seasonal thermal energy storage for a pumping & recharging well

Because of its special casing framework, it is hard for a pumping & recharging well (PRW) to actively use the seasonal thermal energy storage (STES) in the operation period like a conventional groundwater heat pump through exchanging its pumping well with injection well. However, the analyses of perennial behavior to the PRW showed that the phenomena of STES still would be appear apparently for the existence of the thermal breakthrough and the STES provided much large part of heat source or sink. When the accumulated load kept unbalance, for perennial-operation PRW, the pumping temperature could increase or reduce much annually, which even made PRW not work. But when the accumulated load kept balance, the pumping temperature and the thermal energy storage ratio remained basically unchanged. For a PRW in Beijing with summer-winter operation mode, the STES approximately provided 73% low-temperature heat source and 24% heat sink.