基于T形管的自复叠制冷系统性能分析
Performance Analysis of Auto-cascade Refrigeration System Based on T-junction
苏丹丹 1许媛欣 1许伟聪 1赵力1
作者信息
- 1. 天津大学机械工程学院,天津 300350
- 折叠
摘要
T形管中非共沸工质的组分分布对组分可调热力循环性能有重要影响.但目前的研究均是基于理想分离假设分析T形管对热力循环的影响.为研究T形管实际分离性能对热力循环性能的影响,设计了一种基于T形管的新型自复叠制冷系统.对制冷工况下T形管中R134a/R600a的组分分布进行数值模拟,基于数值模拟结果对新型自复叠制冷系统性能进行计算分析.结果表明:T形管出口的流量分配比越高,其分离效率越大.当干度大于0.8或R134a质量分数大于0.7时,T形管两个出口的分离效率相对较小.与无分离的制冷系统相比,基于T形管的自复叠制冷系统的COP可提升0.83％至18.69％,单位容积制冷量可提高3.09％至36.2％,过冷器热负荷可降低11.6％至31.3％.
Abstract
The component distribution of binary zeotropic mixtures in the T-junction has an important influence on the performance of component adjustable thermodynamic cycle.The current researches are all based on assumption of the ideal separation of liquid and gas.In order to study the effect of actual separation performance of T-junction on the performance of component adjustable thermodynamic cycle,a new Auto-cascade refrigeration system based on T-junction is designed.The component distribution of R134a/R600a in the T-junction is simulated under the condition of refrigeration.The performance of new Auto-cascade refrigeration system is calculated and analyzed based on the numerical simulation results.The results show that the higher the mass flow ratio at the outlet of T-junction,the greater the separation effficiency.When the quality is greater than 0.8 or the mass fraction of R134a is greater than 0.7,the separation efficiency of the two outlets is relatively small.Compared with that of refrigeration system without component separation,the COP of Auto-cascade refrigeration system based on T-junction can be increased by 0.83％to 18.69％,the cooling capacity per unit volume of Auto-cascade refrigeration system based on T-junction can be increased by 3.09％to 36.2％,and the thermal load of subcooler can be reduced by 11.6％to 31.3％.
关键词
自复叠制冷系统/非共沸工质/T形管/组分分离/热力学分析Key words
auto-cascade refrigeration system/binary zeotropic mixtures/t-junction/component separation/thermodynamic analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据