工质基团对液泵驱动自然冷却回路系统性能的影响

Effects of a Working Fluid Group on the Performance of a Liquid Pump-driven Free Cooling Loop

工作介质对于冷却系统性能的影响至关重要,而决定工质性能的正是组成它的各个基团的元贡献之和,因此解析工质基团对系统性能的贡献,对适宜工质的筛选和配置具有重要指导意义。本文在基团贡献法的基础上结合液泵驱动自然冷却回路系统的实际循环,针对15种工质的分子基团排列组合,分别研究单原子和多原子基团对液泵驱动自然冷却回路系统性能的影响,结果表明:工质按单原子基团拆分时,C和H原子数越多制冷量越大;工质按多原子基团拆分时,C和H两个原子组成的多原子基团中H原子数越多制冷量越大。

The influence of working fluids on the performance of a cooling system is crucial and the properties of working fluids depend on the contribution sum of the different groups.Therefore,it is essential to analyze the group contribution of working fluids on system performance,which is an important guide for a suitable working fluid match.In this study,the group contribution method was used in the actual cycle of a liquid pump-driven free cooling loop according to the arrangement and combination of the molecular groups of 15 working fluids.The physical properties of the working fluids were investigated using REFPROP when the evaporation temperature was 25℃,the condensation temperature was 15℃,and the mass flow rate was 2700 m3/h.The actual cycle of the liquid pump-driven free cooling loop is used to calculate the refrigeration capacity and energy efficiency ratio.The results show that when the working fluid is separated by a monoatomic group,the larger the number of C and H atoms,the greater the cooling capacity.When the working medium is separated by a polyatomic group,the greater the number of H atoms in the polyatomic group composed of the two atoms of C and H,the greater the amount of cooling.