摘要
为了研究高温级输气量对R410A/R410A变频复叠制冷系统的影响,搭建了变频复叠制冷系统实验台。实验研究了高温级输气量在不同工况下对R410A单一制冷剂变频复叠制冷系统性能的影响规律。实验结果表明:冷凝温度为30℃、蒸发温度为-34~-42℃,高温级压缩机排气温度低于120℃,系统可以安全稳定运行;蒸发温度为-42℃时,高温级输气量从4.44×10^(-4)m^(3)/s增加到8.82×10^(-4)m^(3)/s,系统制冷量增加了81.65%,即高温级输气量每增加5.5×10^(-5) m^(3)/s,制冷量平均增加10.21%;蒸发温度越低,制冷量增长速度越快;系统性能系数COP随着高温级输气量的增加先增大后减小,存在最佳输气量,通过工况及高温级输气量对系统影响的实验结果拟合得到了COP的优化关联式和最佳高温级输气量的优化关联式,为实际应用中高温级输气量的选择提供参考依据。
In order to study the influence of high-temperature-stage gas transmission capacity on R410 A/R410 A frequency conversion cascade refrigeration system, an experimental platform of frequency conversion cascade refrigeration system was built. The effects of high-temperature-stage gas transmission capacity on the system’s intermediate temperature, exhaust temperature, compression ratio, cooling capacity and coefficient of performance(COP) under different working conditions were experimentally studied. The results show that when the condensing temperature is 30 ℃, the evaporation temperature is-34 to-42 ℃, the exhaust temperature of high-temperature-stage compressor is lower than 120 ℃, and the system can operate safely and stably;when the evaporation temperature is-42 ℃, the cooling capacity increases by 10.21% for every 5.5×10^(-5) m^(3)/s of gas transmission capacity;the lower the evaporation temperature is, the faster the cooling capacity increases;COP increases first and then decreases with the increase of gas transmission capacity, the correlation of COP and optimal high-temperature-stage gas transmission capacity are obtained by fitting, which can provide a reference for the selection of high-temperature-stage gas transmission capacity in practical application.
作者
朱轶群
杨永安
黄成军
Zhu Yiqun;Yang Yongan;Huang Chengjun(Tianjin University of Commerce,Tianjin 300134,China)
出处
《低温与超导》
CAS
北大核心
2021年第4期64-70,共7页
Cryogenics and Superconductivity
基金
国家自然科学基金(51706154)资助。
关键词
复叠制冷
COP
输气量
变频
制冷量
Cascade refrigeration
COP
Gas transmission capacity
Frequency conversion
Cooling capacity
