Performance Analysis of Auto-cascade Refrigeration System Based on T-junction
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％.
NETL
NSTL
万方数据
