4种商超CO_(2)双级压缩制冷系统的性能  

Performance of Four Kinds of CO_(2) Two-stage Compression Refrigeration Systems in Supermarkets

作　　者：杨俊兰 杜雨帆 韩一飞 王林秀 YANG Junlan;DU Yufan;HAN Yifei;WANG Linxiu(School of Energy and Safety Engineering,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学能源与安全工程学院,天津300384

出　　处：《天津城建大学学报》2023年第5期328-334,共7页Journal of Tianjin Chengjian University

基　　金：天津市自然科学基金资助项目(17JCZDJC31400)。

摘　　要：为了提高商超跨临界CO_(2)制冷循环的性能,对4种跨临界CO_(2)双级压缩制冷循环(TCTC、TCEC、TCRG、TCRG)建立热力学模型.主要分析了高压压力、中间压力、蒸发温度和气体冷却器出口温度等参数对性能系数(COP)的影响.结果显示:在一定条件下,TCEC循环COP相对最高,比基础循环最优高压COP提高49.82%,最优中间压力COP提高61.41%;TCRC和TCTC循环COP相差无几;TCRG循环COP相对最低.TCRG循环不适用于中低温制冷;TCTC、TCRC循环由于在气冷器出口温度高于37℃后急速下降,不适用于气冷器出口温度较高工况,系统制冷性能受气体冷却器出口温度的影响较大,添加回热器反而降低了系统COP.In order to improve the performance of transcritical CO_(2) refrigeration cycles for commercial supermarket,thermodynamic models for four types of transcritical CO_(2) two-stage compression refrigeration cycles were developed(TCTC,TCEC,TCRG,TCRG).The effects of parameters such as upnormal pressure,intermediate pressure,evaporation temperature and gas cooler outlet temperature on the coefficient of performance(COP)were mainly analyzed.The results showed that:under certain conditions,the COP of the TCEC cycle were the highest,which was 49.82%higher than the optimal high pressure COP of the basic cycle,and the COP of the optimal intermediate pressure was increased by 61.41%;the COP of the TCRC and TCTC cycles were almost the same;the COP of the TCRG cycle was relatively the lowest.The TCRG cycle is not suitable for medium and low temperature refrigeration;the TCTC and TCRC cycles are not suitable for the higher outlet temperature of the air cooler because the outlet temperature of the air cooler drops rapidly after the temperature is higher than 37℃.The cooling performance of the system is greatly affected by the outlet temperature of the gas cooler,and the addition of a regenerator reduces the system COP.

关 键 词：CO_(2)制冷循环 热力分析 双级压缩 中间冷却 

分 类 号：TB657[一般工业技术—制冷工程]