启停过程对空气源热泵-冷柜一体机性能影响的实验研究

Experimental Study on Influence of Start-stop Process on Performance of Unit Integrated with Air-source Heat Pump and Freezer

空气源热泵-冷柜一体机中热泵的启停过程不仅会影响系统供热性能,还会影响冷柜性能。本文实验研究了在单独运行及联合运行工况下考虑空气源热泵的启停过程的空气源热泵-冷柜一体机的性能,分析了空气源热泵的启停次数对热泵系统和冷柜系统性能的影响。实验结果表明:相比热泵单独运行工况,空气源热泵-冷柜一体机中热泵制热量的衰减开始时间延缓约10 min,且联合运行工况下热泵制热量及COP均大于单独运行工况。联合运行工况下,三次启停工况下的空气源热泵对比一次启停工况下的热泵的平均制热量及平均COP分别减少了18.2%和27.3%,平均功耗增加16.3%。相应地,在热泵三次启停工况下对比热泵一次启停工况下冷柜系统平均制冷量以及平均COP分别降低11.6%和11.1%。

The start-stop process of units integrated with air-source heat pumps(ASHPs)and freezer affects the heating performance of the heat pump system and the performance of the freezer.In this study,the performance of the integrated unit under separate operation and combined operation conditions was studied experimentally considering the start-stop process of the ASHP system.The effect of the start-stop times of the ASHP on the performance of the heat pump system and freezer system was analyzed.The experimental results indicated that compared with the different operating conditions of the heat pump,the attenuation start time of the heat pump heating capacity in the integrated unit was delayed by approximately 10 min,and the heating capacity and COP under the combined operation condition were both higher than those in the different operating condition.Under the combined operation condition,the average heating capacity and average COP of the ASHP under the three time start-stop condition were reduced by 18.2%and 27.3%,respectively.The average power consumption was increased by 16.3%compared with that under the one time start-stop condition.Correspondingly,under the three time start-stop condition of the heat pump,the average refrigeration capacity and average COP of the freezer system were reduced by 11.6%and 11.1%respectively compared with the one start-stop condition of the heat pump.