吸气温度对风冷压缩冷凝机组性能影响的试验研究

Experimental performance evaluation for a refrigerant compressor condensing unit under various suction temperatures

保持环境温度32℃和蒸发温度-7℃不变,分析吸气温度的变化对风冷压缩冷凝机组的性能影响。随着吸气温度的变化,风冷压缩冷凝机组存在特征明显的循环过程。吸气温度每升高1℃,制冷量受过热度增加的推动会显著提高4.1%,输入功率微弱下降0.2%,EER提高4.8%,但排气温度也会升高1%,质量流量会下降0.62%。机组实际运行中推荐吸气温度控制在17℃-19℃,此时制冷量平均达到20.2kW,EER达2.35,排气温度有效控制在85.1℃以下,过热度控制在18.9℃-20.3℃,实现机组的性能最优。

This paper evaluated the performance of an air - cooled condensing unit under various suction temperatures with the ambient temperature at 32℃ and the evaporating temperature at 7℃. As the change of suction temperature, air cooled con- densing unit had cycle with typical characteristics. Every 1 ℃ increase of suction temperature on average caused an significant increase of refrigerating capacity by 4.1% , EER by 4.8% driven by the increase of superheat and a tiny drop of power input by 0. 2%. But discharge temperature also rised 1% and mass flow rate falld by 0.62%. To achieve optimal performance of the unit in actual operation,suction temperatures were recommended between 17 -19℃ when refrigerating capacity reached an average of 20.2kW, EER 2.35, discharge temperature below 85.1 ℃, superheat between 18.9 - 20.3℃.