文档介绍：供液压头和蒸发温度对再循环蒸发器循环倍率的影响
戴雅静,臧润清, 李星
(天津商业大学制冷与空调工程系天津制冷技术重点实验室天津 300134)
摘要: 再循环蒸发器的液体冷媒供给量大于蒸发量,一部分液体冷媒只参与循环,不会
蒸发成为汽体。重力供液系统,当供液压头大于蒸发器对冷媒的阻力,液体冷媒就可以在蒸
发器与汽液分离器所形成的回路中再循环,再循环作用的强弱用循环倍率表示。循环倍率与
供液压头和蒸发温度有关。本文推导了均相流模型计算蒸发回路各种阻力的计算公式,针对
一小型制冷系统和专门设计的再循环蒸发器,进行阻力平衡计算。在此基础之上,用空气侧
热平衡阀对该制冷系统进行了供液压头与蒸发温度和循环倍率的相互影响实验。表明所推导
的阻力计算式具有工程应用精度;蒸发温度升高循环倍率减小,且蒸发温度较低时循环倍率
的变化率较小,蒸发温度较高时循环倍率的变化率较大;供液压头增大循环倍率增大,单位
供液压头引起的循环倍率变化随压头的增大而减小,该变化率还随蒸发温度的升高不断缩
小;循环倍率有最优值。
关键词: 再循环蒸发器重力供液蒸发器均相流模型循环倍率
Effect of the supply liquid pressure hydraulic head and evaporation
temperature for the circulating rate of circulating evaporator
Dai Yajing ,Zang Runqing , LiXing
( Department of Refrigeration &Air Conditioning Engineering, Tianjin University of
Commerce,Tianjin Key Laboratory of Refrigeration Technology, Tianjin 300134, China)
Abstract The liquid refrigerant supply of recycling evaporators was greater than evaporation.
Some liquid refrigerant only participated in circulation but not evaporated into vapor. For gravity
feeding refrigeration system, when the hydraulic head was greater than the resistance of the
refrigerant to the evaporator, liquid refrigerant can recycle in the loop formed by the evaporator
and vapor-liquid separator. The strength of recycling was expressed by the circulating rate, which
was connected with the hydraulic head and evaporation tempera