跨临界二氧化碳制冷系统优化方案的研究综述

Review of the Prioritization Scheme of Transcritical Carbon Dioxide Refrigeration Cycle System

跨临界二氧化碳(CO_(2))制冷循环系统因其节能环保的优势受到国内外专家学者的广泛关注,对该系统的研究在近些年取得了重要进展。介绍了CO_(2)制冷剂的环境优势与应用方式,阐述了跨临界CO_(2)制冷循环系统的基本结构,总结了现有系统的四种优化方案:在系统中增设回热器、利用膨胀机代替节流阀、在系统中增设喷射器和采用双级压缩循环方式,随后分析了各种方案的工作原理及特点,并介绍了每种方案的现有研究内容。CO_(2)作为一种非常具有发展潜力的制冷剂,对其跨临界制冷循环系统进行优化可有效的提升系统的制冷系数(COP),有利于充分发挥系统的节能环保优势,从而促进该类型系统的推广应用。

The trans-critical carbon dioxide(CO_(2))refrigeration cycle system has attracted widespread attention from experts and scholars at home and abroad because of its energy-saving and environmental protection advantages.Important progress has been made in the research of this system in recent years.In this paper,the environmental advantages and application methods of CO_(2) refrigerants were introduced,the basic structure of the trans-critical CO_(2) refrigeration cycle system was expound,and four optimization schemes of the existing system were summarized:adding a regenerator to the system,using an expander instead of a throttle valve,adding an ejector to the system,and adopting a two-stage compression cycle method.Then the working principles and characteristics of various schemes were analyzed,and the existing research content of each scheme was introduced.CO_(2) as a refrigerant with great potential for development,we can effectively improve the cooling coefficient(COP)of the system by optimizing its trans-critical refrigeration cycle system,which is conducive to giving full play to the energy-saving and environmental protection advantages of the system,thereby promoting the popularization and application of this type of system.