闭式湖水源热泵与湖水双向影响的模拟研究

Simulation Research on the Bidirectional Influence Between Closed- loop Lake Water Heat Pump and Lake

以南京工程学院的闭式湖水源热泵为原型,建立了二维模型。考虑到闭式湖水源热泵与湖水之间的相互影响,运用FLUENT软件模拟了湖水源热泵温排水流量及抛管间距对湖水温度的影响,同时计算不同温排水流量和抛管距离下闭湖水源热泵系统的COP(Coefficient of Performance,性能系数)。结果表明温排水流量越大,湖水温升面积越大,同时系统COP增大;随着抛管间距的增大,湖水热堆积程度降低,同时系统COP增大。为了不引起水体热污染,同时考虑到闭式湖水源热泵的性能,闭式湖水源热泵的温排水流量设置成0.36 m3/s为宜,其抛管间距设置在0.35 m以上较为合适。

A closed- loop lake water heat pump system in Nanjing Institute Of Technology is taken as the prototype, the two- dimensional model is established. Considering the bidirectional influence between closed- loop lake water heat pump and lake, FLUENT software is used to simulate on lake temperature. Meanwhile, COP in corresponding conditions is calculated. The results show that the higher cooling water flow rate results in the bigger temperature rise area and higher COP. With the increase of the spacing of buried pipes, heat accumulation in lake is reduced, and COP is increased. In order to avoid water heat pollution, and take the performance of closed- loop lake water heat pump into consideration,the appropriate cooling water flow rate is 0. 36 m3/ s, and the corresponding buried pipes spacing is more than 0. 35 meter..