跨临界CO_(2)内部过冷增压制冷系统性能评价

Performance evaluation of transcritical CO_(2) internal supercooled booster refrigeration system

为了改善商超用CO_(2)制冷系统的性能,提出跨临界CO_(2)内部过冷增压制冷(TCISS)系统,对比了该系统与3种不同CO_(2)增压制冷循环的性能,并通过已有试验数据对其仿真模拟结果进行了验证。为详细分析该系统的现实应用性能,进一步建立经济性和环保性模型,并与R134a/CO_(2)复叠制冷(RCOS)系统进行比较,以哈尔滨、北京、南京、广州城市为例,分析2种系统在不同气候区域的性能。结果表明:当高压压力大于10.5 MPa时,环境温度在5~30℃范围内,TCISS循环比其他3种CO_(2)增压制冷循环的COP都要高;TCISS的初始投资成本比RCOS高24.5%,但其年度运行成本更低;TCISS的全生命周期成本(XLCC)普遍低于RCOS,并且在哈尔滨的XLCC最小,在广州的XLCC最大。在4个不同的城市中,TCISS系统的SO_(2),NOx,PM2.5,PM10的4项污染物排放指标均低于RCOS,其总等效变暖效应降低了21.2%~23.9%。研究结果可为推动TCISS系统的发展和应用提供理论指导。

In order to improve the performance of CO_(2)refrigeration system in commercial supermarkets,a transcritical CO_(2)internal supercooled booster refrigeration(TCISS)system was proposed.Firstly,the performance of the system was compared with three different CO_(2)booster refrigeration cycles,and the simulation results were verified by the existing experimental data.In order to analyze the practical application performance of the system in detail so as to further establish the economic and environmental protection model,and to compare with the R134a/CO_(2)cascade refrigeration(RCOS)system,taking Harbin,Beijing,Nanjing and Guangzhou as examples,the performance of the two systems in different climatic regions was analyzed.The results show that when the high pressure is over 10.5 MPa and the ambient temperature is 5~30℃,the COP of TCISS cycle is higher than that of the other three CO_(2)booster cycles.The initial investment cost of TCISS is 24.5%higher than that of RCOS,but its annual running cost is lower;the life cycle cost XLCC of TCISS is generally lower than that of RCOS,and XLCC is the smallest in Harbin and the largest in Guangzhou.For SO_(2),NOx,PM2.5,PM10,the emission of TCISS is lower than that of RCOS in four different cities,and the total equivalent warming effect of TCISS is 21.2%~23.9%lower than that of RCOS.The research results can provide theoretical guidance for promoting the development and application of TCISS systems.