制冷学报Issue(6)：16-20,41,6.DOI:10.3969∕j.issn.0253-4339.2014.06.016
不凝气体对跨临界 CO2制冷系统性能影响的分析
Influence of a Non_condensable Gas on the Performance of CO 2 Trans_critical Refrigeration System
摘要
Abstract
In this paper, non_condensable gas (N2 ) was added to CO2 transcritical refrigeration cycle as additive.And the the effect on refrigerant performance is studied by theoretical analysis and computer simulation.The major thermophysical parameters of CO2 and N2 are analysed.The addition of N2 results in the change of the thermophysical parameters of CO2 .The calculated results have shown that addi_tives can increase saturation pressure and liquid specific heat of CO2 , but reduce viscosity coefficient, surface tension, the liquid∕vapor density ratio and coefficient of thermal conductivity of CO2 .N2 can increase gas nucleus in evaporator, and leads to heterogeneous nuclea_ting process in liquid.So the nucleation temperature decreases and heat transfer coefficientis increases.Moreover, the discharge tempera_ture and specific power of compressor are reduced and refrigeration efficiency improves.The more the N2 is added in the system, the more the refrigeration system performance coefficient increases.The paper provides theoretical basis for the research on highly efficient applica_tion of CO2 refrigeration system.关键词
制冷系统/性能分析/不凝气体/核态沸腾Key words
refrigeration system/performance analysis/non_condensable gas/nucleate boiling分类
通用工业技术引用本文复制引用
胡静,马一太..不凝气体对跨临界 CO2制冷系统性能影响的分析[J].制冷学报,2014,(6):16-20,41,6.基金项目
国家自然科学基金(50976057)资助项目。(The project was support by the National Natural Science Foundation of China ( No.50976057).) （50976057）
