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建立了循环单井地下水流动和换热的数学模型,并通过现场试验的数值模拟验证了模型的正确性。采用原水交换比和原水交换负荷比定量描述了循环单井的原水交换现象。对于典型算例,循环单井的原水交换比为29.6%,原水交换负荷比为23.4%,且基本不随时间变化。原水交换的存在,使得循环单井的热交换效率大大高于土壤源热泵闭式地下换热器,承担负荷的能力也显著提高。
The mathematical model of circulating single well groundwater flow and heat transfer was established. The correctness of the model was verified by numerical simulation of field test. Using raw water exchange ratio and raw water exchange load ratio quantitatively describes the single well of raw water exchange. For a typical example, the raw water exchange ratio for a single well was 29.6% and the raw water exchange load ratio was 23.4%, with little change over time. The existence of raw water exchange makes the heat exchange efficiency of circulating single well much higher than that of ground-source heat pump closed underground heat exchanger, and the capacity of carrying load is also significantly increased.