不同控制策略下的土壤源热泵系统夏季工况实验研究

Experimental Study on Summer Conditions of Soil Source Heat Pump System under Different Control Strategies

在上海地区完成闭式冷却塔-土壤源热泵系统不同控制策略下的夏季实验。实验结果表明:在连续制冷情况下,加入冷却塔能有效改善系统COP,降低土壤温升。不同控制策略对于上海地区制冷系统COP和土壤温升的改善差异不同。在上海典型夏季工况下长期制冷,夜间冷凝温度控制对降低土壤温升和节能效果明显,但随着冷凝温度的增加,效果越差。较优控制策略选择为控制策略3-夜间设定温度29℃控制,该控制策略下机组COP最大值增幅16%,最小值减幅24%;系统COP最大值增幅16%,最小值减幅8%。地下埋管埋深30 m、45 m和60 m处,土壤温升降低最大,分别为64%、64%和63%。

In Shanghai,the refrigeration experiment under the different control of the closed cooling tower-soil source heat pump system was completed.The experimental results show that in the case of continuous cooling,the addition of a cooling tower can effectively improve the system COP and reduce the soil temperature rising.Different control strategies have differences in the improvement of COP and soil temperature rise in refrigeration systems in Shanghai.Long-term cooling under typical summer conditions in Shanghai,nighttime condensation temperature control has a significant effect on reducing soil temperature rise and energy saving,and the effect is worse with increased temperature.The superior control strategy was selected as control strategy 3-night setting temperature 29℃control.In this mode,the maximum COP of the unit increased by 16%,the minimum value decreased by 24%;the maximum increase of system COP was 16%,and the minimum value decreased by 8%.The underground buried pipes are buried at depths of 30 meters,45 meters and 60 meters,and reducing soil temperature rise is the highest,which is 64%,64%and 63%.