内置卧式气液分离器重力再循环制冷系统的实验研究

Experiment on Refrigeration System of Gravity-Recirculation Using Horizontal Gas-Liquid Separator Placed in Cold Storage

中文关键词: 重力再循环  卧式气液分离器  直接膨胀  供液高度  性能系数  传热系数  

英文关键词: Gravity-recirculation  Horizontal gas-liquid separator  Direct expansion  Hydraulic head  

中文摘要:

      本文把卧式气液分离器放置在冷库内部,应用于重力再循环供液制冷系统中。在不同实验工况下,对比研究供液高度为0.8m、1.0m、1.2m和1.6m下的重力再循环供液制冷系统和直接膨胀供液制冷系统的制冷量、压缩机功率、COP、蒸发温度和传热系数的变化。结果表明：冷库温度高于-16.5℃,内置卧式气液分离器重力再循环供液制冷系统的COP随供液高度的升高而增加,冷库温度低于-16.5℃时,供液高度为1.0m的重力再循环供液系统的COP最大；相同蒸发温度下,采用重力再循环供液制冷系统的冷库温度比采用直接膨胀供液制冷系统的冷库温度低8℃左右,内置卧式气液分离器重力再循环供液制冷系统能够达到更低的冷库温度；内置卧式气液分离器重力再循环供液制冷系统与直接膨胀供液制冷系统相比,冷库温度越低,系统制冷量、性能系数和蒸发器传热系数增加幅度越大,低冷库温度下的内置卧式气液分离器重力再循环供液制冷系统运行性能越好。

英文摘要:

      Horizontal gas-liquid separator was placed in cold storage and was applied toSgravity-recirculation refrigeration system. Experiment on gravity-recirculation refrigeration system whose hydraulic head was 0.8m、1.0m、1.2m 1.6m and direct expansion refrigeration system under different operating conditions was performed. During the experiment, refrigerating capacity、compressor power、coefficient of performance、evaporation temperature of refrigeration system and heat transfer coefficient of evaporator were worked out. The results showed that coefficient of performance of gravity-recirculation system increased with the increase of hydraulic head when temperature of cold storage was above -16.5℃ and was the highest under 1.0m hydraulic head when temperature of cold storage was below -16.5℃. Temperature of cold storage of gravity-recirculation system was 8℃ lower than that of direct expansion refrigeration system, it was meaning refrigeration system of gravity-recirculation could provide lower temperature of cold storage. Increase amplitude of refrigerating capacity and coefficient of performance and heat transfer coefficient of evaporator betweenSrefrigeration system of gravity-recirculation and direct expansion was increased as temperature of cold storage dropt. Refrigeration system of gravity-recirculation was better worked in lower temperature of cold storage.