环境参数对回热空气制冷系统COP及能效最优压缩比的影响分析
摘要：为配合加强基加利修正案中氢氟碳化物的管控，环境友好型制冷空调系统的研究成为热点。针对以空气为工质的制冷系统，为研究系统性能系数(COP)及其达峰的最优压缩比，本文建立了回热直流高压空气制冷系统COP计算模型，探讨分析了环境温度、压力及相对湿度等参数对系统COP与能效最优压缩比的影响。结果表明：降低环境温度、增大环境压力可降低系统的能效最优压缩比并提高制冷COP,且环境压力升高可显著减少膨胀过程的凝冰量；环境空气相对湿度对能效最优压缩比及系统制冷COP影响较小。
关键词：回热高压式空气制冷系统性能系数COP)能效最优压缩比环境参数
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Influence of environmental parameters on COP and energy-efficient optimal compression ratio of heat recovery air refrigeration systems
Abstract: The research on environmentally friendly refrigeration and air conditioning systems will become a hot topic in line with the strengthening of HFCs control under the Kigali Amendment. In order to study the coefficient of performance(COP) and the energy-efficient optimal compression ratio, in this paper the COP calculation model is established for the direct current refrigeration system with heat recovery and high pressure using air as the working fluid, and the effects of ambient temperature, atmospheric pressure and relative humidity on the COP and energy-efficient optimal compression ratio of the system are discussed and analysed. The results show that, reducing the ambient temperature and increasing the atmospheric pressure can reduce the energy-efficient optimal compression ratio and improve the COP under refrigeration, and increasing the atmospheric pressure also can reduce frozen water fraction in the expansion process obviously. The relative humidity of ambient air has little effect on the energy-efficient optimal compression ratio and the COP under refrigeration.
Keywords: heat recovery and high pressure; air refrigeration system; coefficient of performance(COP); energy-efficient optimal compression ratio; environmental parameter;
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