热力膨胀阀与蒸发器匹配特性仿真研究  

Research on simulation of matching property of thermostatic expansion valve and evaporator

作　　者：李红民[1] LI Hong-min(School of Energy Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学能源科学与工程学院

出　　处：《资源信息与工程》2020年第1期118-121,共4页Resource Information and Engineering

摘　　要：建立了热力膨胀阀数学模型和基于分相流理论及动态分布参数的蒸发器模型,通过仿真计算获得了逆流式换热时冷冻水回水温度阶跃变化引起热力膨胀阀流量调节、制冷量、过热度等参数的动态变化规律。研究结果表明:热力膨胀阀动态调节过程存在耗时较长,调节过程中存在比较明显的超调量以及制冷剂流量存在时大时小的现象等特点,因此对于空调负荷波动比较频繁的场所不适宜采用热力膨胀阀作为制冷系统的节流装置。本文的研究为制冷系统的优化设计和运行节能提供了理论参考。In this study, the mathematical model of the thermostatic expansion valve and the evaporator model based on the theory of division phase flow and dynamic distribution parameters were established. Through simulation calculation, the dynamic change law of parameters such as the thermal expansion valve flow adjustment, cooling capacity and superheat caused by the step change of return chilled water temperature during counter-flow heat transfer were analyzed. The results show that the thermal expansion valve dynamic adjustment process takes a long time with obvious overshoot and fluctuant refrigerant flow. Therefore it is not suitable to use a thermal expansion valve as a throttling device for refrigeration system in those places with frequent fluctuations of air conditioning load. This research provides a theoretical reference for the optimization of the refrigeration system and its operation energy saving.

关 键 词：热力膨胀阀 匹配特性 回水温度 节流装置 流量调节 阶跃变化 动态调节 空调负荷 

分 类 号：TK511.3[动力工程及工程热物理—热能工程] U473.4[机械工程—车辆工程]