R32吸气状态对变频压缩机效率的影响

发布时间：2018-03-08 05:15

本文选题：热力学　切入点：压缩机　出处：《热能动力工程》2017年09期 　论文类型：期刊论文

【摘要】：制冷剂R32作为R22热门过渡替代制冷剂,运行排气温度高严重影响压缩机长时间运行的可靠性,湿压缩方法可以降低压缩机的排气温度,但也降低了压缩机的效率。通过实验对比研究在定压比变频和定频变压比工况下,不同吸气状态对滚动转子式压缩机效率的影响,得出等熵压缩效率和容积效率与吸气状态的变化关系。实验结果表明:吸气过热时,均能保持较高的等熵压缩效率和容积效率,过热度对其影响不大,吸气带液时压缩机效率的变化趋势与吸气过热时不同,应区分开;相对x=1,x=0.9时等熵压缩效率和容积效率分别降低约7%和5%,总体降幅较小。定频下,压比越大,压缩机效率降低幅度越大,定压下,频率越高,降低幅度越小;等熵压缩效率和综合效率系数的变化趋势相同。
[Abstract]:The refrigerant R32 is used as a hot transition substitute refrigerant for R22. The high operating temperature seriously affects the reliability of the compressor running for a long time, and the wet compression method can reduce the exhaust temperature of the compressor. But it also reduces the efficiency of the compressor. The effects of different inspiratory states on the efficiency of the rolling rotor compressor under the conditions of constant pressure ratio frequency conversion and constant frequency variable-pressure ratio are studied through experiments. The relationship between isentropic compression efficiency and volumetric efficiency and suction state is obtained. The experimental results show that both Isentropic compression efficiency and volumetric efficiency can be maintained when the suction is overheated, and the superheat degree has little effect on the isentropic compression efficiency and volumetric efficiency. The variation trend of compressor efficiency with suction fluid is different from that when suction is overheated, and the isentropic compression efficiency and volumetric efficiency decrease by about 7% and 5, respectively. The greater the reduction range of compressor efficiency is, the higher the frequency is, and the smaller the reduction amplitude is under constant pressure, and the variation trend of isentropic compression efficiency and comprehensive efficiency coefficient is the same.
【作者单位】：上海理工大学制冷与低温研究所;
【基金】：基金项目:上海市动力工程多相流动与传热重点实验室(13DZ2260900)
【分类号】：TH45

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