摘要
随着我国煤改电政策的逐步推行,我国北方地区的冬季采暖面临着环保高效的改进需求,空气源热泵作为近年来研究的热点,其低环温运行的效率值得关注。利用环保混合工质CO_(2)和2,2-二氟丙烷,本研究构建了结构简单、成本低廉且易于控制的回热热泵循环,并通过理论优化分析了该循环不同环境温度下的制热性能。当环境温度从−30℃变动至10℃,回热热泵循环的COP从1.87升高至3.51,单位容积制热量从1773 kJ/m^(3)升高至5516 kJ/m^(3)。通过与常规补气循环的比较,该混合工质及回热循环具有用于冬季采暖的潜力和可行性。此外,由于高沸点组分的加入,传统CO_(2)循环过高的运行压力也得到了很好的控制,这也更有利于该系统的实际应用。
With the implementation of the coal-to-electricity policy of China,efficient and eco-friendly heating methods are demanded for heating in northern China in winter.Air source heat pump is paid more attentions in recent years as a promising heating method,in which its efficiency under low ambient temperatures is urgent to be improved.In this paper,eco-friendly mixed refrigerant(CO_(2) and 2,2-difluoropropane)is applied in a recuperative heat pump with simple structure,low cost and easy control,whose heating performances under different ambient temperatures are analyzed through theoretical optimization.When ambient temperature varies from−30℃to 10℃,its COP varies from 1.87 to 3.51 while its volumetric heating capacity varies from 1773 kJ/m^(3) to 5516 kJ/m^(3).Through the comparison with common vapor-injection cycle,the potential and feasibility of the proposed heat pump cycle and refrigerant for winter heating are demonstrated.Besides,the excessive high operating pressure of regular CO_(2) systems is well reduced due to the addition of 2,2-difluoropropane,which is beneficial for practical applications.
作者
罗介霖
杨凯寅
赵朕
王勤
陈光明
LUO Jielin;YANG Kaiyin;ZHAO Zhen;WANG Qin;CHEN Guangming(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,Zhejiang,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第S01期84-90,共7页
CIESC Journal
基金
国家自然科学基金项目(51976179)。
关键词
环保混合工质
回热热泵
制热性能
理论研究
eco-friendly mixed refrigerant
recuperative heat pump
heating performance
theoretical investigation
