制冷系统湿压缩时吸气干度控制方法的实验研究

发布时间：2018-01-22 18:57

本文关键词： 湿压缩吸气干度排气温度实验研究　出处：《制冷学报》2017年02期 　论文类型：期刊论文

【摘要】：不完全湿压缩能大幅度降低压缩机排气温度,然而该应用的最大难点是如何控制实时压缩机吸气干度在合适的范围内。本文提出了假拟饱和等熵压缩排气温度控制压缩机吸气该干度的方法,理论分析了在AHRI(空调供暖制冷协会)空调和低温制冷两种典型工况下,R22、R32、R134a和R410A四种制冷剂作为冷媒时,应用该方法控制压缩机吸气带液时系统性能的变化,并通过R32实验验证该结论的正确性。结果表明:利用假拟饱和等熵压缩排气温度可以将压缩机吸气状态控制在少量湿蒸气的状态;在T-s图上具有钟型饱和线形状的R32制冷剂,利用假拟饱和等熵压缩所控制的制冷系统,当吸气干度在0.96~1时,制冷量和COP均能达到最大值。
[Abstract]:Incomplete wet compression can greatly reduce the exhaust temperature of the compressor. However, the biggest difficulty in this application is how to control the suction dryness of the real time compressor in a suitable range. In this paper, a method of controlling the suction dryness of the compressor by pseudo quasi saturation isentropic compression exhaust temperature is proposed. Four refrigerants R22R32C134a and R410A are used as refrigerants under two typical conditions: AHRI (Air-Conditioning and Refrigeration Association) and low-temperature refrigeration. This method is used to control the change of the system performance when the compressor is aspirated with liquid. The validity of the conclusion is verified by R32 experiment. The results show that the suction state of the compressor can be controlled to a small amount of wet vapor by using pseudo quasi saturation isentropic compression exhaust temperature. R32 refrigerant with bell-shaped saturation line on T-s diagram is controlled by pseudo-quasi-saturated isentropic compression when the inspiratory dryness is 0.96 ~ 1:00. Both the cooling capacity and COP can reach the maximum.
【作者单位】：上海理工大学;开利空调冷冻研发管理有限公司;
【基金】：上海市重点实验室(1N-15-301-101)项目资助~~
【分类号】：TB657
【正文快照】： P.Mithraratne等[1-3]研究发现:干式蒸发器存在最小稳定过热度,当低于这个值后过热度会发生突变并产生“0过热度振荡”现象,故实际制冷循环常控制过热度在5~10 K。陈文勇[4]认为蒸发器出口的过热度会导致干式蒸发器后端制冷剂存在较长的过热区,过热区段换热面积没有得到充分利

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