喷雾量对移动空调冷凝器喷雾冷却性能的影响

Effect of Spray Amount on Spray Cooling Performance of Mobile Air Conditioning Condenser

本文在焓差实验室中,对一款双风管设置的移动空调的冷凝器左下角和右下角位置设置了喷嘴进行喷雾冷却,测试了在室外侧35℃/24℃(干球温度/湿球温度)、室内侧27℃/19℃(干球温度/湿球温度)时,该移动空调系统的不同状态点温度、耗电量以及制冷量,分析了喷雾量从0.55~2.10 g/s对移动空调性能的影响规律。结果表明:随着喷雾量的增加,移动空调的蒸发压力保持1.0 MPa几乎不变,而冷凝压力从3.45 MPa降至3.14 MPa,冷凝温度从55.5℃降至51.3℃。同时其耗电量从1582.95 W降低至1465.1 W,制冷量从3090 W增至3339 W,EER从1.95增至2.28。但是由于室内温度与环境温度相差仅8℃,冷量[火用]较小,系统[火用]效率仅为5.19%~6.08%。在各部件中,压缩机的[火用]损失系数最大,分别为0.496、0.472、0.479和0.476,而蒸发器的[火用]效率最低,仅为24.85%~26.00%。

In a mobile air conditioner with a double air duct,two nozzles were installed at the lower left and lower right corners of the condenser respectively,for spray cooling.With an enthalpy difference experiment,the temperature at different state points,energy consumption and refrigerating capacity were tested with outdoor temperatures of 35℃/24℃and indoor temperatures of 27℃/19℃(dry bulb temperature/wet bulb temperature),and the influence of different spray quantities from 0.55 g/s to 2.10 g/s on the performance of mobile air conditioning was analyzed.The results show that with the increase in spray quantity,the evaporating pressure was almost unchanged at 1.0 MPa,but the condensing pressure decreased from^(3).45 MPa to 3.14 MPa,and the condensing temperature decreased from 55.5℃to 51.3℃.Moreover,energy consumption decreased from 1582.95 W to 1465.1 W,refrigerating capacity increased from^(3)090 W to 3339 W,and the EER increased from 1.95 to 2.28.The cold exergy was small and the exergy efficiency of the system was only 5.19%to 6.08%because of a small difference of only 8℃between the indoor and ambient temperatures.Among the different components,the maximum exergy loss coefficient occurred in the compressor,which was 0.496,0.472,0.479,and 0.476,respectively,while the lowest exergy efficiency was obtained in the evaporator,which was only 24.6%-26.0%.