适用温热气候的跨临界二氧化碳制冷系统研究新进展

New progress of the study on the application of the critical carbon dioxide refrigeration system for the warm climate

二氧化碳作为环境友好型的自然冷媒已经成功的应用于商业制冷领域,在多种复杂的场合发挥着重要的作用,其应用系统型式多样,主要包括:复叠系统,载冷系统和跨临界系统。其中跨临界制冷系统以CO_2作单一制冷剂,该系统的应用在降低制冷系统对环境的不利影响方面具有独特的优势,其能效表现的好坏直接影响了它的发展和推广应用。对目前CO_2跨临界制冷系统在环境温度较高的温热气候条件下运行效率偏低的问题的几种解决方案进行了综述性的分析。

As an environmental friendly natural refrigerant, carbon dioxide has been successfully applied in commercial re- frigeration field. Its application system mainly includes cascade system, secondary system and transcritieal system. The transcritical system with CO2 as the only refrigerant has unique advantage in reducing the adverse effects on the environment of the refrigera- tion systems. The performance of its energy efficiency has a direct impact on its development and application. In this paper, several solutions to the problem of low operating efficiency of transcritical refrigeration system at warm climate were reviewed.