太阳能喷射制冷系统蒸发器设计参数的优化  

Optimization on Design Parameters of Evaporator in Solar Ejector Refrigeration System

作　　者：张峰峰[1] 田琦[1] 李风雷[1] 白慧峰 

机构地区：[1]太原理工大学环境科学与工程学院,山西晋中030600 [2]山西中绿环保集团有限公司,山西太原030032

出　　处：《中北大学学报（自然科学版）》2016年第6期648-653,共6页Journal of North University of China(Natural Science Edition)

基　　金：国家国际科技合作项目(2013DFA61580)

摘　　要：为研究蒸发器对太阳能喷射制冷系统性能的影响,选出最优的蒸发器设计参数,利用TRNSYS建立了太阳能喷射制冷系统模型,结合FLUENT建立了伴有相变的满液式蒸发器模型.以R141b为工质,计算并分析了在典型气象年的7月11日,蒸发器采用不同的制冷剂进出管位置X、换热管管间距Sh和充液高度h时,系统的制冷量Qe和综合性能系数COPz随冷凝温度和太阳辐射强度的变化结果,在此基础上对蒸发器的设计参数进行了优化.结果表明:其它参数一定时,蒸发器的充液高度为筒体直径D的50%或55%时系统有较好的热性能表现;蒸发器换热管管间距越大,系统制冷量越大;制冷剂进出管距离太大或太小均会削弱系统制冷量,且与筒体中心的水平距离X等于225mm或375mm时系统有较好的热性能.In order to study the effect of evaporator on solar ejector refrigeration system＇s thermal performance and choose the evaporator＇s optimal design parameters,a model of solar ejector refrigeration system was established using TRNSYS.Combining with FLUENT,a model of flooded evaporator with phase change was built.Using R141 bas working medium,refrigerating capacity Qeand coefficient of performance COPzof the system on 11 th of July in typical meteorological year were calculated and analyzed as change of condensing temperature and solar radiation intensity when different outlet and inlet tubes＇ location X,heat-exchange tubes＇ spacing Shand height of initial liquid h were employed.On the basis of all above,design parameters of evaporator were optimized.Results show that the system has better thermal performance with initial liquid at a height of 50% or 55% of cylinder diameter;the system＇s refrigerating capacity is greater when the heat-exchange tubes＇ spacing is larger;The refrigerating capacity of the system is weakened whether outlet and inlet tubes keep too far or too near,while,a horizontal distance of 225 mm or 375 mm from the center of the cylinder helps system presents better thermal performance.

关 键 词：太阳能喷射制冷 系统热性能 满液式蒸发器 设计参数 优化 

分 类 号：TB6[一般工业技术—制冷工程]