空气源热泵翅片管换热器积灰特性研究  

Investigation into ash deposition characteristics on finned tube heat exchangers used in air source heat pumps

作　　者：赵勇 马广兴[1] 常琛 何怡 苑文燕 霍思源 ZHAO Yong;MA Guangxing;CHANG Chen;HE Yi;YUAN Wenyan;HUO Siyuan(College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051

出　　处：《流体机械》2025年第3期52-60,103,共10页Fluid Machinery

基　　金：内蒙古自然科学基金项目(2021MS05032)。

摘　　要：针对空气源热泵因室外换热器脏堵而耗能增加和效率降低的问题,以翅片管换热器为研究对象,综合运用数值模拟与试验验证的方法,借助Fluent流体动力学软件,对颗粒物在6排管的翅片管换热器表面的沉积进行研究,采用SST k-ω模型,分析不同粒径颗粒物在换热器表面的沉积特性。同时,搭建积灰试验系统对数值模拟结果进行验证,利用CCD工业相机捕捉积灰过程中翅片表面的图像,并通过MATLAB对图像与数据进行处理和分析。结果表明,换热管表面的颗粒物沉积分布主要在±75°区域,沉积占比达94%;在换热管的背面,即±(160~180)°区域,沉积占比仅为2%;在较低风速下,换热器表面的颗粒物沉积质量随风速增大而降低;风速达到1.5 m/s后,沉积质量开始上升;混合颗粒物对换热器的脏堵效应具有协同作用,相较于单一粒径颗粒物,混合颗粒物在换热器表面的最大沉积质量、压降及脏堵系数均呈现出更高的水平。研究结果可为空气源热泵系统在实际应用中的维护与优化提供参考。To address the issue of rising energy consumption and decreased efficiency in air source heat pumps caused by outdoor heat exchanger fouling,taking finned tube heat exchanger as the research object,this study utilized Fluent computational fluid dynamics software to investigate particulate matter deposition on a finned tube heat exchanger with six rows of tubes.SST k-ωmodel was adopted.The research deposition patterns of particulate matter with varying sizes on heat exchanger surfaces.At the same time,an experimental setup dedicated to ash deposition is constructed with the objective of validating numerical simulation outcomes.The CCD industrial camera is used to capture the image of the fin surface during the ash deposition process.Subsequently,the captured images and generated data underwent meticulous processing and analysis utilizing MATLAB software.Based on the conclusion drawn,the particle deposition distribution on the surface of the heat exchange tube primarily occurs within the±75°area,constituting 94%of the total deposition.On the back of the heat exchange tube,the deposition ratio is only 2%with the±(160~180)°area.At low wind speed,the mass of particle deposition on the heat exchanger surface decreases as wind speed increases.When the wind speed reaches 1.5 m/s,the deposition quality begins to rise.The findings reveales a distinct pattern in the ash deposition process:The mixed particles exhibit a synergistic effect on the fouling of the heat exchanger.The maximum deposition mass on the heat exchanger surface and the resulting pressure drop and fouling coefficient are higher than those of single particle size particles.The research results can provide reference for the maintenance and optimization of air source heat pump system in practical application.

关 键 词：翅片管换热器 积灰 数值模拟 脏堵系数 

分 类 号：TK172[动力工程及工程热物理—热能工程]