低GWP混合工质回热热泵采暖性能  

Heating performance of recuperative heat pump using low-GWP mixed refrigerant

作　　者：罗介霖 杨凯寅 赵朕 王勤[1] 陈光明[1] LUO Jielin;YANG Kaiyin;ZHAO Zhen;WANG Qin;CHEN Guangming(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]浙江大学制冷与低温研究所,浙江杭州310027

出　　处：《化工学报》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)。

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.

关 键 词：环保混合工质 回热热泵 制热性能 理论研究 

分 类 号：TK11.5[动力工程及工程热物理—热能工程]