【摘要】 以北京某地下水源热泵空调系统为例,利用地下水、热耦合数值模型技术,对冷、热负荷严重不平衡条件下地下水抽灌场地温度场的年内和年际变化进行了定量模拟预测研究,并对系统长期运行的可行性进行了论证。研究结果表明:抽水井和回灌井之间的距离相对较大,抽灌井之间的"热突破"程度较低;由于空调系统的供暖负荷显著大于制冷负荷,抽灌区温度场将呈逐年下降趋势;抽灌场地是一个开放的系统,不断与外界发生能量交换。随着热泵空调系统的长期运行,抽灌区的温度下降速率越来越小,地温场渐趋稳定;由于热泵系统的年内冷、热负荷存在严重失衡,进而对热泵系统的运行效率将产生一定影响。更多还原

【Abstract】 A case study was conducted using the data from an operating system in Beijing.A 3D numerical model was developed to predict the underground temperature field changes for a period of ten years.The results indicated that the time for thermal breakthrough of the pumping wells is relatively long because of relatively long distances between production and injection wells.Due to the fact that the heating load is heavier than the cooling load,the underground temperature falls year by year.Because the groundwater aquifer is an open energy system,the longer the performance time,the smaller the temperature changes of the pumping wells.After several years,the geo-temperature field and its influence range is nearly in a stable state.However,because of yearly unbalanced cooling and heating load,the coefficient of performance (COP)of the system will decrease to a certain degree in the long term.更多还原