技术中心

【关键词】 螺杆式热泵; 异丁烷（R600a）; 近共沸制冷剂; 【英文论文关键词】 Large tonnage air-cooled screw heat pump Isobutane （R600a） Near-azeotropic refrigerant; 【论文摘要】 在热泵运行时,当R134a作为主要的R22替代制冷剂应用于大型螺杆式风冷机组时,会存在能效较低,容易结霜等缺陷。本研究尝试在R134a的大型风冷螺杆热泵机组混合少量R600a来改善性能,通过对混合制冷剂物性计算,理论循环性能计算和机组实验,结果表明添加R600a后的混合制冷剂显著改善了热泵机组的运行性能,并有效提高机组运行可靠性。 【英文论文摘要】 Currently R134a is one of the best substitutes for R22 for the large tonnage water-cooled chiller, however, it is found to apply for heat pumps due to the bad performance and serious coil frost. This research purpose is to improve the performance of the large tonnage screw chiller heat pump by mixing small amount of R600a with R134a. After property calculation, circle simulation and testing, concluded that mixing R600a may significantly improve performance and reliability for the R134a screw heat pump.