蒸发器流路优化对重力再循环制冷系统性能的影响

Effect of evaporator flow path optimization on the performance of gravity feeding refrigeration system

中文关键词: 重力再循环制冷系统  蒸发器流路  循环倍率  制热能效比

英文关键词: gravity feeding refrigeration system  flow path of evaporator  circulating rate  COP

中文摘要:

      对于给定结构的蒸发器来说，其换热效率是由蒸发器的再循环量决定的，再循环量则与制冷剂种类、蒸发温度、供液压头以及制冷剂管传入热量（热虹吸动力）等有关。根据数学模型设计出一种翅片管蒸发器，并对其进行优化，研究不同制冷温度对应循环倍率下蒸发器制冷剂管流路流程布置对制冷剂管传入热量的影响。结果表明，优化后蒸发器的换热系数K比优化前提高15.57%~22.77%，比在直接膨胀供液系统中的换热系数提高了 86.59%~138.22%，制冷量和COP分别最高提高了21.24%和55.49%。

英文摘要:

      The heat exchange efficiency of a evaporator with sure structure is decided by recycle quantity of evaporator. Recycle quantity is connected with the type of refrigerant, evaporation temperature, liquid pressure head, and heat input of refrigerant pipe (thermal-siphon power). According to the mathematical model, a fin tube evaporator is designed, and the fin tube evaporator is optimized.We focus on the influence that the process layout of refrigerant pipe do to the heat input of refrigerant pipe when the evaporator under different cooling temperature corresponding to the circulation ratio. The results show that the heat-transfer coefficient of the optimized evaporator has increased 15.57%~22.77% than that of evaporator before optimization and increased 86.59%~138.22% than that of direct expansion refrigeration system. The highest increases of the refrigerating capacity and COP separately are 21.24%、55.49%.