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针对单井循环地下水源热泵系统有关排放的实验研究不足,搭建砂箱实验台研究其排放特性,并分析实验台与实际工程情况的差异。实验研究结果表明,在取热工况下,排放能够提高热源井的抽水温度和取热量,尤其是对于提高循环单井抽水温度效果显著,但过大排放比的作用有限,在实验条件下,排放比从5.0%增加到32.1%,填砾抽灌同井的取热量仅增加了7.4%。此外,排放可缩小热源井热影响的范围。
In view of the lack of experimental research on the discharge of single-well circulating groundwater heat pump system, the sand bench is set up to study its emission characteristics and the differences between the experimental bench and the actual project are analyzed. Experimental results show that under the condition of heat release, the discharge can raise the pumping temperature and the amount of heat removal of the heat source well, especially for improving the pumping single-well pumping temperature, but the effect of excessive emission ratio is limited. Under the experimental conditions, The discharge ratio increased from 5.0% to 32.1%, and the heat input of the same well in the gravel pumping and pumping increased by only 7.4%. In addition, emissions can reduce the thermal effects of heat source wells.