具有精馏装置的自动复叠制冷循环分析

本文提出了一种新的具有精馏装置的自动复叠式制冷循环，并以 Ｒ１３４ａ／Ｒ２３为制冷剂。对新循环进行了热力学分析，建立了能量与质量平衡方程，分析了循环工质配比、吸气温度及精馏塔操作压力对压缩机压比及系统ＣＯＰ的影响。作者进一步将新循环与二级分凝循环在压比控制于９～１２、冷凝器出口温度保持在４０℃的前提条件下进行了性能上的比较，发现新循环既可达到更低的制冷温度，又可在相同平均蒸发温度下获得更高的ＣＯＰ。

ANALYSIS OF AN AUTO-REFRIGERATING CASCADE SYSTEM UTILIZING A RECTIFYING COLUMN

This paper presents a new auto-refrigerating cascade cycle that employs arectifying column. A thermodynamic analysis of the cycle is conducted withR134a/R23 as working fluid. Energy and mass balance equations are establishedfor each component of the system. The mixture composition, the suctiontemperature and the operating pressure of the rectifying column， areanalyzed of their impacts on compression ratio and coefficient of performance.Furthermore, a comparison is made between the new cycle and the two-separatorcycle when the compression ratio is limited between 9 and 12 and the outlettemperature of the condenser is fixed at 40. It is found that thenew cycle can not only offer a lower refrigerating temperature but also havea higher COP provided that the average evaporating temperature is the same.