Article(id=1319293333302792293, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1319293220169826420, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-0329.2025.06.001, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1729699200000, receivedDateStr=2024-10-24, revisedDate=1737820800000, revisedDateStr=2025-01-26, acceptedDate=null, acceptedDateStr=null, onlineDate=1792473641944, onlineDateStr=2026-10-20, pubDate=1751212800000, pubDateStr=2025-06-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792473641944, onlineIssueDateStr=2026-10-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792473641944, creator=13701087609, updateTime=1792473641944, updator=13701087609, issue=Issue{id=1319293220169826420, tenantId=1146029695717560320, journalId=1316781260334530699, year='2025', volume='53', issue='6', pageStart='1', pageEnd='118', issueExtLink='null', onlineDate='null', pubDate='1751212800000', pubDateStr='2025-06-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792473614971, creator='13701087609', updateTime=1792473614971, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=1, endPage=8, ext={EN=ArticleExt(id=1319293334875656294, articleId=1319293333302792293, tenantId=1146029695717560320, journalId=1316781260334530699, language=EN, title=Dust removal study for finned‑tube heat exchangers based on jet airflow technology, columnId=null, journalTitle=Fluid Machinery, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the heat transfer deterioration caused by dust accumulation on outdoor heat exchangers of air‑source heat pumps,a visual dust removal test rig was constructed.Using mixed particles with diameters of 10 µm and 20 µm,dust removal tests were conducted on plain finned‑tube heat exchangers at different jet angles and wind speeds.Results show that under frontal horizontal jetting,when wind speed reaches 21 m/s,dust removal rate reaches 97%.Under reverse horizontal jetting at 28 m/s,dust removal rate is 40%.At 16 m/s frontal jetting speed,during the initial stage,dust removal rate increases with rising airflow angle,reaching a maximum of 94.7% at approximately 30° above horizontal.When airflow angle further increases,dust removal rate begins to decline.Dust removal mass ratio at 21 m/s frontal jetting speed also peaks around 30° at 92.9%.These findings provide important references for optimizing dust removal strategies of air‑source heat pump outdoor heat exchangers.

, authors=Yong ZHAO, Guangxing MA, Chen CHANG, Yi HE, Wenyan YUAN, Siyuan HUO, authorsList=Yong ZHAO, Guangxing MA, Chen CHANG, Yi HE, Wenyan YUAN, Siyuan HUO, authorCompany=null, correspAuthors=Guangxing MA, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319293340823179396, articleId=1319293333302792293, tenantId=1146029695717560320, journalId=1316781260334530699, language=CN, title=基于喷射气流技术的翅片管换热器除灰研究, columnId=1317484286475883136, journalTitle=流体机械, columnName=试验研究, runingTitle=null, highlight=null, articleAbstract=

针对空气源热泵因室外换热器附着灰尘导致传热恶化的问题,搭建可视化换热器除灰试验台,采用颗粒物粒径为10 µm和20 µm的混合颗粒,对平直翅片管换热器进行不同喷射角度和风速的除灰试验。结果表明,正面水平喷气情况下,当风速提升到21 m/s时,除灰率达97%;反面水平风速为28 m/s时,除灰率为40%;在16 m/s正向喷射风速下,初始阶段时,空气源热泵室外换热器的除灰率随气流角度逐渐增加而上升,气流角度达到水平偏上30°左右时,除灰率达到最大,为94.7%;当气流角度继续增加时,除灰率开始呈现下降趋势;正向喷射风速为21 m/s时的粉尘脱落质量比也在30°左右达到最大值,为92.9%。研究结果可为优化空气源热泵室外换热器的除灰策略提供重要参考。

, authors=赵勇, 马广兴, 常琛, 何怡, 苑文燕, 霍思源, authorsList=赵勇, 马广兴, 常琛, 何怡, 苑文燕, 霍思源, authorCompany=null, correspAuthors=马广兴, authorNote=

赵勇(1999),男,硕士研究生,主要从事空气源热泵室外换热器的积灰与除灰等方面的研究工作,E-mail:。

, correspAuthorsNote=
马广兴(1972),男,博士,教授,硕士生导师,主要从事热泵技术与建筑节能、低碳建筑与可再生能源利用等方面的研究,通信地址:010051内蒙古自治区呼和浩特市内蒙古工业大学土木工程学院,E-mail:。
, copyrightStatement=作者向本刊所投稿件一经本刊录用,则该论文的复制权、发行权、信息网络传播权、翻译权、汇编权等权利视为自动转让给本刊。本刊为国内各主要数据库收录期刊,本刊所发表的稿件将同时通过互联网进行网络出版或提供信息服务。, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=93RvAsY+dAgX9H5Z8MJVsQ==, magXml=g5w6LLhZcN1Awp9OiD41Ew==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=ed7p8otJS7y60ZToxof4HA==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=gOQJKEpYpvdlknfWvB8uxQ==, mapNumber=null, fund=null)}, authors=[Author(id=1319293341120974985, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=zhaoyong90408@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1319293341200666763, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, authorId=1319293341120974985, language=EN, stringName=Yong ZHAO, firstName=Yong, middleName=null, lastName=ZHAO, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1319293341263581324, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, authorId=1319293341120974985, language=CN, stringName=赵勇, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=内蒙古工业大学 土木工程学院,呼和浩特 010051, bio={"content":"

赵勇(1999),男,硕士研究生,主要从事空气源热泵室外换热器的积灰与除灰等方面的研究工作,E-mail:。

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赵勇(1999),男,硕士研究生,主要从事空气源热泵室外换热器的积灰与除灰等方面的研究工作,E-mail:。

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surface area ash characteristics of finned tube heat exchanger and its influence on pressure drop and heat transfer performance[D].Shanghai:Shanghai Jiao Tong University,2019., articleTitle=null, refAbstract=null), Reference(id=1319293353410285810, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=22, rfOrder=38, authorNames=null, journalName=null, refType=null, unstructuredReference=常乐.TSP的粒度分级研究[J].环境科学与管理,2009,34(3):72-75., articleTitle=null, refAbstract=null), Reference(id=1319293353473200371, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=22, rfOrder=39, authorNames=null, journalName=null, refType=null, unstructuredReference=CHANG L.Particle size grading study of TSP[J].Environmental Science and Management,2009,34(3):72-75., articleTitle=null, refAbstract=null), Reference(id=1319293353557086452, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=23, rfOrder=40, authorNames=null, journalName=null, refType=null, unstructuredReference=KLINE S J,MCCLINTOCK F A.Describing uncertainties in single‑sample experiments[J].Mechanical Engineering,1953,75(1):3-8., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1319293341028700293, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, xref=null, ext=[AuthorCompanyExt(id=1319293341032894598, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, companyId=1319293341028700293, language=EN, 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journalId=1316781260334530699, articleId=1319293333302792293, language=CN, label=图11, caption=除灰率90%与95%时各角度对应的风速, figureFileSmall=rgv61DrEstZPlQzJue3gFg==, figureFileBig=/KLVkXYccXCmsG57lKtL/w==, tableContent=null), ArticleFig(id=1319293346498072774, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=EN, label=Fig.12, caption=Finned‑tube heat exchanger before and after dust removal, figureFileSmall=pKIcbnHpS0RJL/bfnwlZaA==, figureFileBig=+OICcY8CmDkVG3OhfuBz1A==, tableContent=null), ArticleFig(id=1319293348167405767, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=CN, label=图12, caption=翅片管换热器除灰前后对比

(a)除灰前  (b)除灰后

, figureFileSmall=pKIcbnHpS0RJL/bfnwlZaA==, figureFileBig=+OICcY8CmDkVG3OhfuBz1A==, tableContent=null), ArticleFig(id=1319293348226126024, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=EN, label=Tab.1, caption=

Test sample structure parameters

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参数数值
规格(长×宽×高)/(mm×mm×mm)300×150×240
管外径/mm10
管壁厚/mm0.6
翅片间距/mm2
翅片厚度/mm0.2
横/纵向管间距/mm21(横向管)/24(纵向管)
横/纵向管排数6(横向管)/10(纵向管)
), ArticleFig(id=1319293348314206409, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=CN, label=表1, caption=

测试样件结构参数

, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值
规格(长×宽×高)/(mm×mm×mm)300×150×240
管外径/mm10
管壁厚/mm0.6
翅片间距/mm2
翅片厚度/mm0.2
横/纵向管间距/mm21(横向管)/24(纵向管)
横/纵向管排数6(横向管)/10(纵向管)
), ArticleFig(id=1319293348389703882, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=EN, label=Tab.2, caption=

Error of test parameters

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参数试验仪器量程精度/误差
风速热线风速仪0.01~30 m/s±4%
粉尘质量电子天平0~3 kg±0.01 g
脏堵系数——±0.03%
粉尘浓度——±3.2%
), ArticleFig(id=1319293348456812747, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293333302792293, language=CN, label=表2, caption=

试验参数的误差

, figureFileSmall=null, figureFileBig=null, tableContent=
参数试验仪器量程精度/误差
风速热线风速仪0.01~30 m/s±4%
粉尘质量电子天平0~3 kg±0.01 g
脏堵系数——±0.03%
粉尘浓度——±3.2%
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基于喷射气流技术的翅片管换热器除灰研究
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赵勇 , 马广兴 , 常琛 , 何怡 , 苑文燕 , 霍思源
流体机械 | 试验研究 2025,53(6): 1-8
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流体机械 |试验研究 2025 , 53 (6) : 1 -8
基于喷射气流技术的翅片管换热器除灰研究
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赵勇 , 马广兴 , 常琛, 何怡, 苑文燕, 霍思源
作者信息
  • 内蒙古工业大学 土木工程学院,呼和浩特 010051
通讯作者:
马广兴(1972),男,博士,教授,硕士生导师,主要从事热泵技术与建筑节能、低碳建筑与可再生能源利用等方面的研究,通信地址:010051内蒙古自治区呼和浩特市内蒙古工业大学土木工程学院,E-mail:。
作者简介:

赵勇(1999),男,硕士研究生,主要从事空气源热泵室外换热器的积灰与除灰等方面的研究工作,E-mail:。

Dust removal study for finned‑tube heat exchangers based on jet airflow technology
Yong ZHAO , Guangxing MA , Chen CHANG, Yi HE, Wenyan YUAN, Siyuan HUO
Affiliations
  • College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China
出版时间: 2025-06-30 doi: 10.3969/j.issn.1005-0329.2025.06.001
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针对空气源热泵因室外换热器附着灰尘导致传热恶化的问题,搭建可视化换热器除灰试验台,采用颗粒物粒径为10 µm和20 µm的混合颗粒,对平直翅片管换热器进行不同喷射角度和风速的除灰试验。结果表明,正面水平喷气情况下,当风速提升到21 m/s时,除灰率达97%;反面水平风速为28 m/s时,除灰率为40%;在16 m/s正向喷射风速下,初始阶段时,空气源热泵室外换热器的除灰率随气流角度逐渐增加而上升,气流角度达到水平偏上30°左右时,除灰率达到最大,为94.7%;当气流角度继续增加时,除灰率开始呈现下降趋势;正向喷射风速为21 m/s时的粉尘脱落质量比也在30°左右达到最大值,为92.9%。研究结果可为优化空气源热泵室外换热器的除灰策略提供重要参考。

空气源热泵  /  翅片管换热器  /  喷射气流  /  除灰率  /  脏堵系数

To address the heat transfer deterioration caused by dust accumulation on outdoor heat exchangers of air‑source heat pumps,a visual dust removal test rig was constructed.Using mixed particles with diameters of 10 µm and 20 µm,dust removal tests were conducted on plain finned‑tube heat exchangers at different jet angles and wind speeds.Results show that under frontal horizontal jetting,when wind speed reaches 21 m/s,dust removal rate reaches 97%.Under reverse horizontal jetting at 28 m/s,dust removal rate is 40%.At 16 m/s frontal jetting speed,during the initial stage,dust removal rate increases with rising airflow angle,reaching a maximum of 94.7% at approximately 30° above horizontal.When airflow angle further increases,dust removal rate begins to decline.Dust removal mass ratio at 21 m/s frontal jetting speed also peaks around 30° at 92.9%.These findings provide important references for optimizing dust removal strategies of air‑source heat pump outdoor heat exchangers.

air‑source heat pump  /  finned‑tube heat exchanger  /  jet airflow  /  dust removal rate  /  fouling coefficient
赵勇, 马广兴, 常琛, 何怡, 苑文燕, 霍思源. 基于喷射气流技术的翅片管换热器除灰研究. 流体机械, 2025 , 53 (6) : 1 -8 . DOI: 10.3969/j.issn.1005-0329.2025.06.001
Yong ZHAO, Guangxing MA, Chen CHANG, Yi HE, Wenyan YUAN, Siyuan HUO. Dust removal study for finned‑tube heat exchangers based on jet airflow technology[J]. Fluid Machinery, 2025 , 53 (6) : 1 -8 . DOI: 10.3969/j.issn.1005-0329.2025.06.001
空气源热泵凭借绿色环保、兼顾制冷制热功能得到了飞速的发展,在全世界范围内广泛应用,且清洁供暖的推进使空气源热泵的安装急速上升[1-3]。但随着长时间使用和年限增长,空气中的灰尘会不断与空气源热泵室外换热器发生碰撞、滞留,从而在翅片表面堆积大量灰尘[4-6],影响了换热器的传热效率。因此,研究翅片管换热器的清洁技术具有重要意义。
目前,国内外学者从换热器的积灰机理、粉尘分布特性及影响粉尘沉积的多种因素等方面,对其进行了广泛研究。唐家俊等[7]对翅片管换热器积灰进行试验研究,得出随着翅片管换热器表面积灰量的增大,其空气侧阻力在前期逐渐升高、而在后期趋于稳定。LIU等[8]对北京地区某空气源热泵进行为期120 天的持续监测发现,积灰情况覆盖了室外换热器面积的60%,空气侧的压降增大了187.5%。鞠培玲等[9-10]研究发现,灰尘会增加换热器空气侧压降,严重影响换热性能,空调换热器使用5 年后换热量衰减达11.2%~19.3%。本课题组[11]曾对平直翅片换热器进行积灰研究发现,当风速从1.5 m/s增大到3.0 m/s,空气侧污垢热阻减小54%,压降增幅减小18.3%。邓赛峰等[12]设计了基于变制冷剂流量型多联式空调系统换热器的自动清洁功能,发现在相同的条件下运行20 min,室内风机转速为350 r/min时,凝结水量达到最优值186 g,实现最佳清洁效果。程英模等[13]针对矿井高温、高湿、高粉尘的工作环境,提出一种利用冷凝液滴清除矿用空冷器翅片表面粉尘的方法,得出超疏水表面的除尘性能最佳。然而,目前关于空气源热泵室外换热器清洁策略的研究仍显不足。
本文基于喷射气流技术,选取平直翅片管换热器为测试样件,搭建可视化换热器除灰试验平台,采用粒径10 µm和20 µm混合颗粒物作为模拟粉尘,通过试验模拟不同喷射角度与风速下的除灰效果,分析翅片管换热器除灰前后的脏堵系数,旨在找到最佳的喷射气流角度和风速,以提高除灰效率,为空气源热泵的高效运行提供理论支持。
为直观地观测空气源热泵室外换热器积灰与除灰的完整流程,本研究针对典型狭窄过流通道的平直管翅式换热器[14-18],根据实际空气流速进行试验,并在此基础上搭建了可视化试验平台,如图1所示。
试验平台的核心部分包括一个300 mm×300 mm×3500 mm的风道系统、测试样件、均流段、颗粒物混合段、测试段、图像采集段及数据处理段等。试验选择可调速离心风机型号为HXF-100,其流量达2 100 m3/h,全压为1 050 Pa。通过调节其变速开关,可以精确控制试验风道中的空气流速。给料系统采用螺旋给料机进行灰尘等颗粒物的输送,通过微调螺旋给料机的转速,实现对喷粉浓度的精确控制,从而有效调节气流中的灰尘浓度,确保物料在持续不断的输送过程中,颗粒物的浓度始终维持在恒定水平。变速气流喷射器型号为KF-8925,风速调节范围0~28 m/s,通过调节风速,满足除灰时的风速变化。搭建固定支架,使气流喷射器可以固定角度,上下往复喷射除灰。
图像采集段及数据处理段选用计算机视觉系统与型号为STC-SCS231POE的CCD工业摄像机,其分辨率1 920×1 200,搭载Sony 1/1.2″IMX249传感器,以Basler GigE作为输出接口,帧率41.6 帧/s,采用逐行扫描方式,采集的图像清晰度较高。
以空气源热泵常用的平直翅片管换热器作为测试样件,其具体结构参数见表1。
换热器表面沉积的粉尘颗粒物来源不同,其化学成分在不同情况下存在一定差异。根据GB/T 13270—91《大气 试验粉尘标准样品 模拟大气尘》,试验中使用白陶土代替粉尘颗粒物,其主要成分为SiO2[19]。
孙煜光[20]对粉尘沉积速率随风速与颗粒物粒径的变化情况进行了研究,结果如图2、图3所示。从图2可以看出,在翅片表面,粒径10 µm颗粒物的沉积速率随风速的增加先增大、后减小;当风速达到2.5 m/s时,颗粒物沉积速率达到峰值,为0.025 1 kg/(m2⋅s),之后,随着风速的进一步增加而下降。从图3可以看出,不同粒径的颗粒物在翅片与换热管表面的沉积速率变化表现出相似的模式,随着颗粒物粒径的增大,沉积速率起初呈现增长趋势,并在粒径为20 µm时达到峰值。
粉尘样品的粒径主要以0.1~50 µm为主,其中不同地区粉尘样品中,该区间内粉尘占比均超过了79%[21]。常乐[22]研究发现,室外大气中总悬浮颗粒物(TSP)的粒度分布呈现出双峰状态,冬季大约在7 µm与20 µm处出现峰值。通过采样并使用 Mastersizer 2000激光衍射粒度分析仪(测量粒径范围可达0.02~2 000 µm),对采集的样本进行粒度分析,得出粉尘的中值粒径为10 µm[11]。由上述分析可知,空气中的颗粒物主要集中在0~30 μm的粒径范围内。因此,为了更全面地反映颗粒物在翅片表面的沉积行为,试验按7∶3的比例将粒径为10 μm与20 μm的颗粒物进行混合。
根据GB 50736—2012《民用建筑供暖通风与空气调节设计规范》,空气源热泵室外换热器的迎面风速通常在1~3 m/s之间。实际运行中的风速为1.5~2 m/s。风速为1.5 m/s与2 m/s时,污垢热阻与压降增幅随时间的变化都呈现相同的趋势,且风速从1.5 m/s增大到2 m/s,稳定后的污垢热阻增加了17.3%,压降增幅减少了8.0% [11],变化相对较小。因此,选择风速为1.5 m/s进行试验。
高流速喷射气流能有效清除换热器表面的粉尘,发挥清洁效能,但在实施过程中,必须审慎控制风速,以防止气压过高,从而导致翅片形变,影响其长效性能。因此,为了确保清洁效果与翅片的稳定性,喷气的风速需控制在适当范围内。采用与翅片方向相平行的喷射方式,能够最大限度地利用风速优势,确保气流在翅片间均匀分布,减少对翅片的冲击和变形。
将脏堵区域图像的每一个像素点按照脏堵程度进行分类,阈值相近的像素点被归为一类,可以更好地反映出换热器表面脏堵情况。引入室外换热器表面脏堵系数S为脏堵区域占翅片管换热器投影区域面积的比例关系,表征脏堵程度。定义每个阶段的脏堵图像像素点个数之和与换热器外露区域总像素之比为表面脏堵系数[19]。
选取1.2,2.7 g/m3两种颗粒物浓度,分析脏堵系数随时间的变化情况,结果如图4所示。
开始时,脏堵系数随着时间的推移迅速上升,表明颗粒物在初期有聚集效应,对换热器的脏堵效应显著。然而,当脏堵系数达到20%后,增长速度逐渐放缓,表明系统在经历了一段时间的运行后,逐渐适应了颗粒物的存在,并达到了一个相对稳定的动态平衡状态。当颗粒物累积至一定量,随着沉积层厚度的增加,边缘颗粒因较长力臂导致相互间粘附力减弱,不足以抵抗重力作用,已形成的沉积区域难以再承载新增颗粒。此时,沉积与脱落的颗粒物数量趋于平衡,脏堵系数在特定区间内维持动态稳定状态。在动态平衡阶段,颗粒物浓度2.7 g/m3的脏堵系数(38.5%)略高于1.2 g/m3的脏堵系数(37.8%)。为了更真实地模拟实际使用中的脏堵情况,在每次除灰试验开始之前,将换热器上的脏堵系数增加至30%左右。
试验开始前,将1块清洁的平直翅片管换热器(即测试样件),精确地安装到测试风道中;随后,在风机的驱动下,气流经匀流板后平稳地流过换热器。
进入积灰试验阶段,首先将螺旋给料机的漏斗内填满粉尘样品;随后控制螺旋给料机,使颗粒物的浓度始终维持在1.2 g/m3的恒定水平。试验进行40 min后,将换热器上的脏堵系数增加至30%左右,完成整个积灰试验流程。
为了增强图像中边缘、轮廓及脏污区域的辨识度,利用MATLAB平台中的Kirsch算子对采集图像实施锐化操作。图5示出10 μm和20 μm颗粒物按一定比例混合,粉尘浓度为1.2g/m3时,换热器表面在0,30,60 min时的粉尘沉积情况及经过算法处理后的图像。
除灰试验依托热敏分辨率0.01 m/s的testo425数字热线风速仪进行风速的调整,以确保数据的准确、可靠性。通过调整支架角度(0~90°)和气流喷射器风速(0~28 m/s),对换热器进行不同角度和风速下的除灰操作,观察每次除灰过程中的粉尘脱落情况,采集每次除灰操作后的换热器表面脏堵图像,并将这些图像实时传输至高速视觉计算机进行进一步分析处理。
运用Kirsch算子对采集图像进行锐化处理,突出图像上的边缘、轮廓和脏堵区域的特征,得出每个图像的像素点个数,从而得到每个阶段的脏堵系数。同时,收集每次除灰后的粉尘,对除灰前后的粉尘质量进行对比。
给料系统采用螺旋给料机进行灰尘等颗粒物的输送。使用下式控制输送颗粒物的速度:
Ql=0.25π(D2‒d2)SlnφρsCs
式中,Ql为给料机输送能力,kg/s;D为给料机叶片直径,m;d为给料机转动轴的直径,m;Sl为给料机传动轴螺距,m;n为给料机转速,r/s;φ为物料填充系数;ρs为物料堆积密度,kg/m3;Cs为给料机倾角系数。
颗粒物传输过程如图6所示。在颗粒流体两相流动中,颗粒物的速度uP一般与流体速度u不同。滑移速度u-uP,导致了颗粒表面压力分布的不平衡,同时在颗粒表面产生黏性应力,从而产生合力,即曳力。粒子在流场中受曳力作用及颗粒相运动方程见文献[19]。
试验测量参数的误差依据所用仪器的精度进行量化,根据KLINE等[23]提出的计算方法对间接计算参数的误差加以确定,如表2所示。
除灰时的具体气流方向及颗粒物脱落受力情况如图7所示。通过试验观察,发现积灰主要集中于换热器翅片前侧,在正面喷气时,喷气方向能够覆盖大部分积灰区域,实现较为均匀和高效的除灰。相比之下,反面喷气除灰时,由于换热器的厚度影响,会在积灰区域形成除灰盲区,这不利于换热器的完全清洁。
在对空气源热泵室外换热器进行水平喷气除灰的研究中,对比了正面喷气与反面喷气2种除灰方式的除灰效果,具体情况如图8所示。
试验的除灰率用下式表示:
W=(S0-SC)/S0
式中,W为除灰率;S0为初始脏堵系数;SC为除灰后的脏堵系数。
结果表明,2种喷气方式在低风速下均显示出相对较低的除灰率,但随着风速的增加,除灰率逐渐上升。在正面喷气时,低风速下的除灰率相对较低,是因为在低风速条件下,积灰更容易在换热器翅片上形成稳定的沉积层。然而,当风速增加到21 m/s时,除灰率显著提升至97%,表明适当的风速能有效去除积灰。反面喷气风速为28 m/s时的除灰率仅为40%,这表明反面喷气除灰所需的平均风速较大,不利于节能。为了实现节能、高效和均匀的除灰效果,在进行空气源热泵室外换热器的除灰操作时,优先选择正面喷气的方式。
为探究气流喷射角度(除灰角度φ)与风速对除灰率的影响,在不同风速下,通过调节气流喷射器的支架角度来模拟不同的喷气角度,对平直翅片管换热器进行除灰试验。不同除灰角度下除灰率随风速的变化如图9所示。
除灰角度φ〔见图9(a)〕定义为气流方向与换热管中心连接线及水平方向形成的夹角,旨在通过正面喷气方式有效提升除灰效果。
各角度的除灰率随风速变化情况如图9(b)所示。在风速较低(0~2 m/s)时,所有角度下的除灰率均呈现出缓慢增长的趋势。这是因为低风速环境中积灰易于积累,此时增加喷气角度能够使重力的更多分力转化为粉尘脱落所需的力,进而提升了除灰效率。随着风速的进一步提升,除灰率经历了一个显著的加速增长阶段,最终趋向于一个接近完全除灰(100%除灰率)的趋势。这种变化情况表明,在达到某一临界风速后,气流的动力学效应显著增强,可快速移除积灰,直至达到除灰效率的饱和点。当喷气角度位于30°~45°区间时,达到90%除灰率所需的最低风速相较于其他角度更低。这表明,在此角度范围内,气流对积灰的清除作用最为高效,能够以较小的风速实现较高的清洁效果。因此,将气流喷射方向设定为与水平方向呈30°~45°的角度,能确保在相对较低的能耗下获得最佳的除灰效果。
由图9(b)可以看出,采用正向喷气方式且风速增加至10 m/s时,首次达到了90%的除灰率;而风速进一步提升至16 m/s时,超过半数角度区域下的除灰率稳固在90%以上;风速达到21 m/s时,超过半数角度区域下的除灰率稳固在95%以上。鉴于这3个关键风速下的除灰表现,将10 m/s与16 m/s风速下的除灰率及21 m/s时的粉尘脱落质量比进行深入的分析、探讨。试验中的粉尘脱落质量比表示为:
Wt=mt/mj
式中,mt为脱落的粉尘质量;mj为换热器积灰总质量。
图10示出空气源热泵室外换热器在不同喷射风速(10,16 m/s)时的除灰率,以及风速为21 m/s时,粉尘脱落质量比的变化情况。
从图可见,风速为10 m/s与16 m/s时,除灰率呈现出相似的趋势,2种喷射风速条件下,随着气流角度逐渐增加,除灰率在初始阶段也增加。这种趋势一直持续到气流角度约为30°时,风速为10,16 m/s的除灰率分别达到了90.4%,94.7%。随着气流角度的进一步增加,2种情况下的除灰率均开始呈现下降趋势。喷射风速为21 m/s时,粉尘脱落质量比呈现出与除灰率类似的变化趋势。随着气流角度的增加,粉尘脱落质量比呈先增大、后减小的趋势,并在30°时达到最大值92.9%。
当期望除灰率分别达到90%和95%时,不同角度下所需的风速情况如图11所示。
可以看出,除灰率达到90%时,随着气流角度的增加,所需的最小风速起初逐渐减少,气流角度在30°左右时,风速达到了最低值,仅为10 m/s。但随着角度的进一步增加,所需的最小风速也逐渐增加。此外,当除灰率达到95%时,所需的最小风速与之前有显著差异。在初始阶段,随着气流角度的增加,所需的最小风速同样呈下降趋势。在15°~45°范围内,风速达到了最低值,为18 m/s。之后,随着气流角度的进一步增加,各角度所需的最小风速也开始逐渐增加。当调控喷气角度为30°时,喷射气流在复杂的力学环境中达成了克服黏性力、惯性力、静电力等阻力因素的最佳平衡状态,确保了喷射气流能高效地作用于颗粒物,使其从固着状态解离并脱落。此角度不仅增强了气流对翅片管表面及其上沉积物的覆盖与冲击,同时减少气流损失并诱发二次冲击效应,确保了系统运行的优化与清洁效能的提升。
气流角度为30°时,翅片管换热器表面除灰前后情况如图12所示。
(1)在翅片表面,风速增加时,粒径10 μm颗粒物的沉积速率先增大、后减小,当风速增大到2.5 m/s时,颗粒物的沉积速率达到峰值,为0.025 1 kg/(m2⋅s)。脏堵系数在初始阶段随着时间的推移迅速上升,达到20%后,增长速度逐渐放缓,最终达到了动态平衡状态。
(2)正面水平喷气能够覆盖大部分积灰区域,实现均匀高效的除灰,当风速增加至21 m/s时,除灰率显著提升至97%。因换热器厚度的影响,反面水平喷气会形成除灰盲区,且除灰所需的平均风速较大。
(3)在10 m/s与16 m/s的正向喷射风速下,除灰率在气流喷射角度增加到30°左右时达到最大值,分别达到了90.4%,94.7%。正向喷射风速为21 m/s时,粉尘脱落质量比也在30°左右时达到最大值,为92.9%。
(4)当期望除灰率达到90%时,在气流角度30°左右时达到了最低值,为10 m/s。当期望除灰率达到95%时,在15°~45°范围内达到了最低值,为18 m/s。

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doi: 10.3969/j.issn.1005-0329.2025.06.001
  • 接收时间:2024-10-24
  • 首发时间:2026-10-20
  • 出版时间:2025-06-30
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  • 收稿日期:2024-10-24
  • 修回日期:2025-01-26
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    内蒙古工业大学 土木工程学院,呼和浩特 010051

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马广兴(1972),男,博士,教授,硕士生导师,主要从事热泵技术与建筑节能、低碳建筑与可再生能源利用等方面的研究,通信地址:010051内蒙古自治区呼和浩特市内蒙古工业大学土木工程学院,E-mail:。
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2种不同金属材料的力学参数
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species
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Percentage of
total species (%)
属
Genus
种数
Number of
species
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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