一种跨临界CO2热泵系统的设计  

Design of a transcritical CO2 heat pump system

作　　者：胡健 HU Jian(Huadian Zhengzhou Mechanical Design and Research Institute Company Limited,Zhengzhou 450046,China)

机构地区：[1]华电郑州机械设计研究院有限公司,郑州450046

出　　处：《华电技术》2020年第12期67-71,共5页HUADIAN TECHNOLOGY

摘　　要：随着人们对能源需求量的提高和节能环保的重视,CO2热泵在制冷与热泵领域的研究越来越多。热泵供热与其他方式供热相比系统效率较高,仅消耗少量高品位热能就可以利用环境中的低品位能量,即进行余热利用,是一种理想供热系统。CO2作为天然工质具有极大优势,其热力学性能较好,符合清洁环保需求。介绍了CO2跨临界循环的优势和意义,在此基础上通过对热力过程的分析建立了CO2跨临界循环的热力循环,进行了循环各状态点的分析和选取,依据国标计算了CO2跨临界循环的各个参数点,通过优化使得热泵系数COPh提高到3.793。结果表明跨临界循环既提高了系统的供热效率,又使得设备空间得以压缩,有着极大的发展潜力与改进空间。With the increasing demand for energy and intensive attention paid on energy conservation and environmental protection,more and more studies have been made on CO2 heat pumps applied in refrigeration and heat pump.Compared with other heat-supply methods,heat pump is more efficient in heat supply.It can make use of a large amount of low-grade heat in environment with only a little high-grade heat consumption,which is called waste heat utilization,an ideal heatsupply system.As a natural working medium,CO2 is of prominent advantages for its good thermodynamic performance and conforming to clean and environmental requirements.Based on the introduction and advantage analysis on CO2 transcritical cycle,a thermodynamic cycle of a CO2 transcritical cycle was built and state points of the cycle were selected and studied in thermodynamic process.According to the national standard,CO2 transcritical cycle state points with various parameter were calculated,and the Coefficient of Performance of the heat pump(COPh)was increased to 3.793 by optimization.The results show that transcritical cycle not only improves the heating efficiency of the system,but also compresses the equipment space,which has great development and improvement potential.

关 键 词：CO2热泵 CO2跨临界循环 热泵供热 热力循环 节能环保 

分 类 号：TU822.2[建筑科学]