预冷换热管束除霜/冰实验研究  

Experiment Study on Defrost of Precooling Heat Exchanger With Tube Bundle

作　　者：贾云涛 徐向华[1] 房圣友 李育隆 梁新刚[1] JIA Yun-Tao;XU Xiang-Hua;FANG Sheng-You;LI Yu-Long;LIANG Xin-Gang(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education. School of Aerospace, Tsinghua University, Beijing 100084, China)

机构地区：[1]清华大学航天航空学院热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2019年第5期1139-1142,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51376101);国家自然科学基金创新研究群体项目(No.51621062)

摘　　要：本文对冷媒入口温度在-10～-60℃条件下的细管束预冷换热器的结霜/冰及除霜/冰特性进行了实验研究。单列细管的霜/冰产生和消除过程的研究采用图像对比和测量压降的方法,除霜/冰采用向主气流喷射乙醇的方法。研究结果表明,在空气湿度不变时,细管的霜/冰层厚度随冷媒温度的下降而增加,但霜/冰层厚度增加的趋势逐渐减小;冷媒温度不变时,霜/冰层厚度随空气湿度增加而逐渐减小。实验验证了在管内冷媒-60℃以上,8 min的时间内喷入乙醇具有有效的抑霜/冰能力。In this paper, the frost and defrost characteristics of pre-cooling heat exchanger with fine tube bundle was investigated experimentally for the inlet coolant temperature range of-10^-60℃.The frost and defrost process of the single-row tube arrangement is researched by image comparison and pressure drop measurement. The method of injecting ethanol to the main flow is employed to remove frost. The results indicate that, the frost layer thickness increases with the coolant temperature decreasing, but the increasing tendency slowing down at constant air humidity. The frost layer thickness decreases with the air humidity increasing at constant coolant temperature. The result verified that, at a coolant temperature above-60℃, injecting ethanol can effectively inhibit the formation of the frost layer within eight minutes.

关 键 词：预冷换热器 细管束 结霜 除霜 

分 类 号：TK172[动力工程及工程热物理—热能工程] V19[航空宇航科学与技术—人机与环境工程]