平行流扁管三介质换热器性能实验研究  

Experimental Study on a Three-fluid Heat Exchanger With Parallel Flat Tubes

作　　者：李晓林 刘克函 李东东 张朋磊 LI Xiaolin;LIU Kehan;LI Dongdong;ZHANG Penglei(Key Laboratory of Aircraft Environment Control and Life Support,MIIT,Nanjing University of Aeronautics and Astronautics,Nanjing210016,China)

机构地区：[1]南京航空航天大学人机与环境工程系,南京210016

出　　处：《工程热物理学报》2025年第2期375-383,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52176157)。

摘　　要：三介质换热器结构紧凑,可实现三种介质同时直接换热,具有广阔的应用前景,但实验数据较为缺乏。本文搭建了基于平行流扁管的三介质换热器性能测试实验台,通过实验测试了其换热性能。结果表明:三介质换热器的换热性能主要与制冷剂、空气、水流量和三者之间温差相关;当蒸发器出口制冷剂过热时,增加制冷剂流量可显著提高换热量,但干度低于1以后继续增加流量换热性能基本保持不变,制冷剂与水换热时,随着制冷剂流量从15.6 kg/h增加到40.5 kg/h,换热量从817.3 W逐渐增加,稳定在1100 W左右;换热量随任意二者温差的增大而线性增加,随着风温从23.9℃增加到30.0℃,总换热量从1037.6 W增大到1307.4 W;且换热量随着风速、水流速的增加而增加。The three-fluid heat exchanger features a compact structure,enabling concurrent direct heat exchange among three distinct fluid,thereby presenting significant potential for diverse applications.However,a notable limitation is the scarcity of experimental data.This study established an experimental platform for performance testing of a three-fluid heat exchanger utilizing parallel flat tubes and conducted experimental tests to evaluate its heat transfer efficiency.The results show that the heat transfer performance of the three-fluid heat exchanger is primarily influenced by the refrigerant,air,and water flow rates,as well as the temperature differentials between them.When the refrigerant experiences superheating at the evaporator outlet,enhancing the refrigerant flow rate can notably enhance the heat transfer efficiency.However,once the dryness fraction falls below 1,further increasing the flow rate leads to minimal change in heat transfer performance.In the interaction between the refrigerant and water,an increment in the refrigerant flow rate from 15.6 kg/h to 40.5 kg/h results in a gradual rise in heat transfer capacity from 817.3 W to a plateau around1100 W.The heat transfer capacity escalates linearly with the temperature difference between any two mediums.With the elevation of air temperature from 23.9℃ to 30.0℃,the total heat transfer capacity increases from 1037.6 W to 1307.4 W,with the heat transfer efficiency bolstered by higher air speed and water flow rates.

关 键 词：三介质换热器 平行流扁管 传热性能 实验研究 

分 类 号：TK172[动力工程及工程热物理—热能工程]