CO2跨临界循环在热泵热水器中的应用 （郑州轻工业学院机电工程学院） 摘要全球正面临着严重的温室效应和臭氧层破坏问题，各国都致力于研究出氟利昂的替代制冷剂。CO2是一种天然工质，它优于其它常用制冷剂的性能表现正好符合现在的环境要求，是热泵热水器系统最具潜力的替代工质之一。分析目前市场上出现的各种热水供应设备，将CO2和其他制冷剂做性能比较，给出了CO2跨临界循环的典型流程和特点；对CO2跨临界特性、设备的开发以及循环的可靠性和安全性进行综合分析。说明CO2跨临界循环在热泵热水器中应用的优越性，以及该技术在国内的应用前景和方向。 关键词二氧化碳跨临界循环热泵热水器 A Study on The Application of CO2 Transcritical Cycle in Heat Pump Water Heater (College of Mechanical and Electrical Engineering in Zhengzhou University of Light Industry) Abstract We are facing serious whole world green-house effect and the ozone layer destroyed in recent years, every country is focusing on the research of a replaced refrigerant of the HFC.CO2is a natural substance, it has a more excellent performance than the other refrigerants, which is competent for the enviromental request nowadays. So it can be the most potential refrigerant in heat pump water heater to replace the HFC. By analysing a series of devices, providing hot water, saled in the markets, and comparing CO2 with the the other refrigerants, this article tells the typical diagram and the characteristic of the CO2transcritical cycle and anlyses the properties of CO2refrigeration transcritical cycle, the equipment exploitation and the security and reliability of the CO2transcritical system.The aim is to introduce the superiority of the application of CO2 transcritical cycle in heat pump water heater, and tell us the potentiality and the direction of CO2 transcritical cycle technology in China. Keywords CO2 transcritical cycle heat pump water heater 0前言 二氧化碳作为制冷剂已经超过100年。自上世纪30年代碳氟类制冷剂的出现之后，二氧化碳曾经一度退出制冷舞台，直到上世纪90年代末期，在