摘要
针对带回热器闭式跨临界CO_(2)热泵干燥系统,本文实验研究了电子膨胀阀(EEV)开度对闭式CO_(2)热泵干燥系统运行参数及性能的影响。结果表明:随着EEV开度从20%升至50%,制热量、制冷量和系统功耗均不断降低,压缩机排气压力和EEV进口压力不断下降,压缩机吸气压力和EEV出口压力缓慢上升,压比不断减小,制热性能系数(COP_(h))、系统性能系数(COP_(sys))和单位能耗除湿量(SMER)均先升高后下降,单位时间除湿量(MER)逐渐降低;当EEV开度为20%和50%时,制热量分别为7.04 kW和5.34 k W,制冷量分别为5.83 kW和4.28 kW,系统功耗分别为1.87 kW和1.46 kW,MER分别为3.52 kg/h和2.64 kg/h,COP_(h)分别为4.03和3.97,COP_(sys)分别为6.86和6.58,SMER分别为1.88 kg/(kW·h)和1.81 kg/(kW·h);当EEV开度为30%时,COP_(h)、COP_(sys)和SMER有最大值,分别为4.13、7.00和1.98 kg/(kW·h)。
The influence of the electronic expansion valve(EEV)opening degree on the operating parameters and performance of a closed transcritical CO_(2) heat pump drying system with an internal heat exchanger is experimentally investigated in this paper.The results show that,as the electronic expansion valve(EEV)opening is increased from 20%to 50%,the heating capacity,refrigeration capacity and system power consumption are all continuously decreased.The discharge pressure of the compressor and the inlet pressure of the EEV continuously are decreased.The suction pressure of compressor and outlet pressure of the EEV slowly are increased,while the pressure ratio continuously is decreased.The coefficient of performance for heating(COP_(h)),coefficient of performance for system(COP_(sys)),specific moisture extraction rate(SMER)are all initially increased and then decreased,while the moisture extraction rate(MER)is gradually decreased.When EEV opening is set to 20%and 50%,the heating capacity is 7.04 kW and 5.34 kW,the refrigeration capacity is 5.83 kW and 4.28 kW,the system power consumption is 1.87 kW and 1.46 kW,the MER is 3.52 kg/h and 2.64 kg/h,the COP_(h) is 4.03 and 3.97,the COP_(sys) is 6.86 and 6.58,and the SMER is 1.88 kg/(kW·h)and 1.81 kg/(kW·h),respectively.When the EEV opening is adjusted to 30%,the COP_(h),COP_(sys),and SMER are determined to reach their maximum values of 4.13,7.00,and 1.98 kg/(kW·h),respectively.
作者
王怀琛
武卫东
张华
李振博
侯亚祥
WANG Huaichen;WU Weidong;ZHANG Hua;LI Zhenbo;HOU Yaxiang(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《制冷技术》
2025年第3期9-15,34,共8页
Chinese Journal of Refrigeration Technology
基金
国家自然科学基金(No.52176016)。
关键词
跨临界CO_(2)
热泵干燥
电子膨胀阀开度
性能系数
单位能耗除湿量
Transcritical CO_(2)
Heat pump drying
Electronic expansion valve opening
Coefficient of performance
Specific moisture extraction rate
