摘要
为了改变进入微通道蒸发器制冷剂的气液比例,以强化其内部制冷剂的均匀性,进而提高空气源热泵的制热性能,文章在微通道蒸发器进口处增设了低压储液器,并对该空气源热泵系统的各项性能进行了实验研究。实验结果表明:在微通道蒸发器进口处增设低压储液器,有利于均匀分配该蒸发器内部的制冷剂,提高了该蒸发器表面结霜的均匀性,并且空气源热泵的平均制热量提高了27.2%,COP提高了34.8%;由于微通道蒸发器空气源热泵系统没有将低压储液器内分离出的气态制冷剂排出,导致该空气源热泵中压缩机的吸排气压力出现波动,空气源热泵运行状态的稳定性受到了一定影响。
To improve microchannel evaporator based air source heat pump(ASHP)'s coeffcient of performance(COP)by enhancing the unifomity of rfrigerant distribution in the way of changing the proportion of gas and liquid refrigerant entering the microchannel evaporator,an ASHP with a low-pressure liquid reservoir ahead of the microchannel evaporator was presented.The performance of the ASHP system was experimentally studied.Results showed that the low-pressure refrigerant reservoir was beneficial to the uniform distribution of refrigerants in the microchannel heat exchanger and to the uniforn distribution of frost on the surface of microchannel heat exchanger.Compared with the ASHP without low-pressure refrigerant reservoir,heating capacity and COP of the ASHP with low-pressure liquid reservoir ahead of the microchannel evaporator increased by 27.2%and 34.8%respectively.However,because the separated gas refrigerant in the reservoir was not exported,there existed complicated heat exchange and phase transition between the gas and liquid refrigerant,and finally led to the fluctuation and instability of the ASHP'suction and discharge pressure.
作者
胡文举
葛宇
贾鹏
高岩
Hu Wenju;Ge Yu;Jia Peng;Gao Yan(School of Environment and Energy Engnering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)
出处
《可再生能源》
CAS
北大核心
2020年第10期1326-1332,共7页
Renewable Energy Resources
基金
国家自然科学基金(51508016)
国家安全与环境重点实验室开放基金项目(BSBE2017-6)
北京建筑大学市属高校基本科研业务费专项资金(X18243)。
关键词
空气源热泵
气液分离
微通道蒸发器
制冷剂分配
air source heat pump
gas-liquid separation
microchannel evaporator
refrigerant distribution
