基于一维模型的喷射制冷系统性能计算分析  

Performance Analysis of an Ejector System Based on 1-D Ejector Model

作　　者：李风雷[1] 曹波[1] 程志雯[1] 田琦[1] 

机构地区：[1]太原理工大学环境科学与工程学院,太原030024

出　　处：《太原理工大学学报》2013年第2期142-146,共5页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(50976074)

摘　　要：对索科洛夫等人提出的一维喷射器模型进行了修正并与其他部件的控制方程相结合,建立了更为完善的喷射制冷系统的性能计算模型,提高了计算模拟的准确性。以R141b为制冷剂,对热力参数和喷射器喉部面积比变化时喷射制冷系统的性能进行了模拟计算。计算结果表明:蒸发温度越高,喷射制冷系统的喷射系数和性能系数(COP)越高;冷凝温度降低、发生温度升高均有利于喷射系数和COP的提高,但冷凝温度和发生温度存在一个最佳值;喉部面积比越大,最大临界喷射系数越大,但需要的发生温度也越高。因此,在喷射制冷系统的设计和运行中要选择合理的喷射器结构参数和运行参数,以提高喷射制冷系统的性能。The 1-D model proposed by Sokolov et al. was modified and integrated to the con trol equations of the other components. Then a novel model for performance evaluation of an ejec- tor refrigeration system was developed. The accuracy of simulation was improved. Calculations were carried out using R141b as refrigerant. It can be derived that the entrainment ratio and the coefficient of performance （COP） increase with the increase of the evaporation temperature. They also increase with the decrease of condensation temperature and the increase of generation temper ature. But there is an optimum value of condensation temperature and generation temperature separately. The ejector with higher cross-sectional area ratio of the nozzle throat and the mixing chamber yields a higher maximum critical entrainment ratio. However, the corresponding genera- tion temperature should be raised too. The construction and thermodynamics parameters should be chosen properly in design and operation process in order to improve the performance of the e jector refrigeration system.

关 键 词：喷射制冷 性能 热力参数 面积比 制冷剂 

分 类 号：TB617[一般工业技术—制冷工程]