摘要
针对采用传统蒸气压缩制冷循环的冷藏冷冻箱的冷藏室换热温差大、有效能损失大的缺陷,提出了一种新的串联式双毛细管冷藏冷冻箱制冷循环。该循环系统是在常规的制冷循环的冷藏蒸发器和冷冻蒸发器之间增加一个毛细管,以提高冷藏蒸发温度,从而减少传热温差,进而降低冷藏室的有效能损失。利用PR方程计算制冷剂的热力学性质,编写了蒸气压缩制冷循环的有效能分析程序,分别对传统和新提出的冷藏冷冻箱制冷循环进行了计算。结果表明:传统冷藏冷冻箱制冷循环在制冷剂为R12、R134a时,有效能效率分别为21.20%、20.57%;双毛细管冷藏冷冻箱制冷循环在制冷剂为R12、R134a时,有效能效率分别为23.97%、23.44%;同比提高13.07%和13.95%。
A new double - capillary tube refrigeration system for refrigerator - freezers was proposed. A capillary tube was added between the two evaporators in the fresh and frozen food storage chests to raise the evaporation temperature of the fresh food, and reduce the heat exchange temperature difference and the available energy loss. PR equation was adopted to calculate the thermodynamic properties of the refrigerants, and the available energy analysis for the vapor compression refrigeration cycle was programmed to calculate thermodynamic performances of the new and the conventional refrigeration cycle of therefrigerator - freezer. The calculation results show that the available energy efficiency of the conventional refrigeration cycle of the refrigerator - freezer is 21.20% and 20.57%, respectively when the refrigerant is R12 and R134a while that of the double - capillary tube refrigeration cycle of the refrigerator - freezer is 23.97%and 23.44%, respectively. By comparison, the available energy efficiency of the new refrigeration system increases by 13.07% and 13.95%, respectively.
出处
《制冷学报》
CAS
CSCD
北大核心
2007年第2期42-47,共6页
Journal of Refrigeration
关键词
热工学
双毛细管系统
有效能分析
卧式冷藏冷冻箱
Pyrology
Double - capillary tube
Available energy analysis
Chest refrigerator
