二氧化碳制冷系统毛细管的设计及实验研究  

Design and experimental study of capillary tube in transcritical carbon dioxide refrigeration system

作　　者：王栋[1] 李蒙 戚利利[3] 钱付平[1] 

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243002 [2]丹佛斯(上海)自动控制有限公司,上海201103 [3]上海理工大学能源与动力工程学院,上海200093

出　　处：《化工学报》2011年第10期2753-2758,共6页CIESC Journal

摘　　要：利用绝热毛细管内制冷剂流动特性的数学模型,在给定运行工况下,针对工质为二氧化碳的制冷系统用微元法编制了计算程序,模拟了二氧化碳毛细管内的流动曲线,得到毛细管流量与尺寸及进口压力的变化关系。搭建了小型二氧化碳跨临界循环制冷系统,通过实验研究,得出了该毛细管在不同的高压侧压力及气冷器出口温度下的流量特性曲线。将实验结果与模拟结果进行对比,结果表明:流量随着气冷器出口温度和高压侧压力的变化趋势相同,且实验数据与模拟计算值基本吻合。本研究可为二氧化碳制冷系统毛细管的设计提供理论指导。The mathematical model of the flow characteristics while the refrigerant flows through adiabatic capillary tubes is used in this paper. By using finite difference method under the given operating mode, a computer program is planned for a carbon dioxide refrigeration system. The change of the refrigerant flow rate with lengths and inlet pressures of the capillary tube is obtained. An experimental system of carbon dioxide refrigeration cycle is established with the designed capillary. The relations among carbon dioxide mass flux, inlet pressure and the outlet temperature of gas cooler are presented. The calculation results are consistent with experimental data. The results indicate that the change of flow rate has the same trend with the change of the outlet temperature of gas cooler or the pressure of high pressure side. This study may provide theoretical guidance on design of capillary in transcritical carbon dioxide refrigeration system.

关 键 词：二氧化碳制冷系统 毛细管 流量特性 

分 类 号：TB657.9[一般工业技术—制冷工程]