跨临界CO_(2)制冷技术发展现状及其改进途径综述

Review of Development Status and Improvement Approaches of Transcritical CO_(2)Refrigeration Technology

跨临界CO_(2)制冷是一种以CO_(2)作为制冷剂气体冷却过程在临界点以上的新型制冷技术。对近年来CO_(2)制冷技术的发展进行了概括及分析。针对传统制冷剂与CO_(2)制冷剂的特点,重点分析了二者在物理性质上的区别,说明了CO_(2)作为新型制冷剂的可取性;针对提升制冷系数的目标,讨论了两级压缩、膨胀机、回热器的工作原理以及对系统性能的影响。综述了新型双级压缩CO_(2)制冷循环的研究现状,归纳了CO_(2)制冷循环进一步改善性能的技术途径。

Transcritical CO_(2)refrigeration is a new type of refrigeration technology in which CO_(2)is used as refrigerant in the process of gas cooling above the critical point.This paper summarizes and analyzes the development of CO_(2)refrigeration technology in recent years.According to the characteristics of traditional refrigerant and CO_(2)refrigerant,the differences in physical properties of the two are analyzed,and the desirability of CO_(2)as a new refrigerant is illustrated.Aiming at improving the refrigeration coefficient,the working principle of two-stage compression,expander and regenerator and its influence on the system performance are discussed.The research status of a new type of two-stage compression CO_(2)refrigeration cycle is reviewed,and the technical ways to further improve the performance of CO_(2)refrigeration cycle are summarized.