文档介绍：CO2 两相流引射循环制冷系统性能的数值模拟

张中芳郭宪民赵阳

(天津商业大学天津市制冷技术重点实验室,300134,天津)

摘要本文建立了改进了的引射器内部简化热力学模型和制冷系统的数学模型。利用
MATLAB 语言编写程序对两相流引射循环制冷系统循环性能进行了模拟计算,分析了工况参
数及引射比对引射循环系统性能的影响。模拟结果表明:在不同工况条件下,使 CO2 系统稳
定运行的最佳引射比的取值差异较大;在相同工况条件下,与传统等焓节流制冷循环相比,
CO2 两相流引射循环制冷系统的 COP 最高能提高 65%;同时验证了 CO2 两相流引射制冷循环系
统存在不同的气冷器出口温度对应不同的最优高压侧压力。
关键词两相流引射循环, CO2 跨临界制冷循环,数值模拟

NUMERICAL SIMULATION ON PERFORMANCE OF CO2
REFRIGERATION SYSTEM WITH TWO-PHASE EJECTOR

Zhang Zhongfang. Guo Xianmin. Zhao Yang.
(Tianjin University merce, Tianjin Key Laboratory of Refrigeration Technology, Tianjin300134)

Abstract In this paper, the mathematical model of the TPERS was build based on the
performance of the existing TPERS experimental test facility, the stability criterion of the TPERS
was proposed and a simulation program, which was programmed with MATLAB, was developed
to solve the mathematical model. The effects of the working conditions and entrainment ratios on
the system performance were analyzed. The numerical simulation results show that: the COP and
cooling capacity decrease with the increasing in the entrainment ratio. With the increase of
entrainment ratio, two-phase ejector cycle refrigeration system performance has declined; in the
same working conditions, the CO2 TPERS COP is higher than the traditional cycle; The COP of
the CO2 TPERS is pared with the traditio