动态负荷下地源热泵系统的优化设计

针对动态负荷下地源热泵地埋管换热器的设计问题,提出一种最佳负荷的设计方法,并通过数值模拟和实测实验的方法研究了6种不同负荷下钻孔壁中点处的温度响应.实验结果表明:1)在周期性脉冲热流的作用下,钻孔壁温度呈周期性震荡并逐渐升高;2)每一时刻,动态负荷作用下的温度响应均小于其最佳设计负荷的温度响应,即最佳设计负荷可以代替动态负荷,由此验证了最佳负荷设计公式的合理性.本设计方法考虑了建筑热负荷的动态变化特性,有效节省了换热器的埋管长度.

Optimizing design of ground source heat pump systems under dynamic load

A new heat load design method was put forward for designing heat exchanger under dynamic load, and the temperature responses of borehole wall under six different types of dynamic loads were studied by using numerical simulation and field experiment method. The results show that: 1)under a periodical pulsed heat generation, the temperature of borehole wall has a fluctuant rising tendency; 2) at any moment,the temperature response of the dynamic load is lower than that of the design load, that is to say, the design load is equivalent to the dynamic loads, thus the validity of this design method is proved. Considering the dynamic characteristics of building thermal load, this method can effectively reduce the length of buried pipe.