欢迎来到天天文库
浏览记录
ID:33810456
大小:1.08 MB
页数:7页
时间:2019-03-01
《蒸压加气混凝土砌块墙体热湿耦合传递特性》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com第18卷第1期建筑材料学报VoI.18。NO.12015年2月JOURNALOFBUILDINGMATERIALSFeb..2O15文章编号:1007—9629(2015)01—0088—07蒸压加气混凝土砌块墙体热湿耦合传递特性黄建恩,吕恒林,冯伟,陈艳霞,周泰(中国矿业大学力学与建筑工程学院,江苏徐州221l16)摘要:运用开尔文定律和克劳修斯一克拉贝龙方程,将多孔建筑材料内水蒸气传递量和液态水传递量转变为以水蒸气分压力为驱动势的统一函数,以温度和水蒸气分压力为驱动势建立了热湿耦合传递模型,并模
2、拟分析了上海地区自然干燥状态下加气混凝土砌块墙体10a的热湿性能变化规律.结果表明:对于初始温度为298K,含湿量(质量分数,下同)分别为2.91,3.45%,5.03%,8.6O的4种工况,经过1a的使用后,墙体内的温湿度分布不再受初始条件影响;在正常情况阶段,墙体内表面相对湿度均小于1.0,不会出现结露现象,但是在部分时段超过了0.8,易产生霉变;墙体内部含湿量呈周期性变化,空调季为3.34~8.31,平均值4.45;采暖季为3.31~3.69,平均值3.47.关键词:蒸压加气混凝土砌块;墙体;热传递;湿传递;热湿耦合;传递特性中
3、图分类号:TU111.19文献标志码:Adoi:10.3969/j.issn.1007—9629.2015.01.016CoupledHeat&MoistureTransmissionCharacteristicsofAutoclavedAeratedConcreteBlockWallHUANGJian’ell,LUHenglin,FENGWei,CHENYanxia,ZHOUTai(SchoolofMechanics&CivilEngineering,ChinaUniversityofMining&Technology,Xuzhou
4、221116,China)Abstract:UsingKelvin’SequationandtheClausius—Clapeyronequation,vaporandliquidflowsthroughporousbuildingmaterialsmaybeexpressedasaunifiedfunctionsusingwatervaporpartialpressureasdrivingpotentials.Mathematicalmodelofcoupledheatandmoisturetransferformultilayer
5、wallwasestablishedandvalida~tedusingtemperatureandwatervaporpartialpressureasdrivingpotentia1.Thetemperatureandmoisturevar—iationsin10yearsaeratedconcretemasonrywallweresimulatedaccordingtothetypicalmeteorologicaldataofShanghai.Withoriginalconditionthatthetemperaturewas
6、298K,themassmoisturecontentswere2.919/6,3.45,5.O3,8.6Oforfourdifferentconstructionconditionsrespectively,temperatureandmoisturedistributioninwallwasindependentoforiginalconditionafteroneyearofuse.Inphaseofthenormalusecon—dition。therelativehumidityinsidewallwas1essthan1.
7、0withoutcondensationoccurring,butinsometimeperiodtherelativehumiditywashigherthan0.8causingmildewgeneration.Moisturecontentinsidewallchangedperiodically,varyingbetween3.34一8.31withanaverageof4.45%inair—conditioningseason,3.31一3.69withanaverageof3.47inheatingseason.Keywo
8、rds:autoclavedaeratedconcreteblock;wall;heattransfer;moisturetransfer;coupledheatandmoisture:transmissionchara
此文档下载收益归作者所有