Influence of non-uniform moisture absorption and desorption on thermal conductivity of building materials

LI Juanhong; ZHANG Pengyu; WANG Yingying

doi:10.11835/j.issn.2096-6717.2021.199

您当前的位置：

首页 >

文章列表页 >

Influence of non-uniform moisture absorption and desorption on thermal conductivity of building materials

Civil Engineering | 更新时间：2023-07-10

- Influence of non-uniform moisture absorption and desorption on thermal conductivity of building materials
- Journal of Civil and Environmental Engineering Vol. 45, Issue 4, Pages: 163-172(2023)
- 作者机构：
  
  1.西安建筑科技大学，建筑设备科学与工程学院，西安 710054
  2.西安建筑科技大学，西部绿色建筑国家重点实验室，西安 710054
- 作者简介：
  
  brief: LI Juanhong (1996- ), main research interest: coupled heat and moisture transfer in buildings, E-mail: 2985124710@qq.com.
  WANG Yingying （corresponding author）, professor, E-mail: 1274296191@ qq.com.
- 基金信息：
  
  Shaanxi Youth Science and Technology New Star Project(2021KJXX-31);National Natural Science Foundation of China(51878534;51590911)
- DOI：10.11835/j.issn.2096-6717.2021.199
  CLC： TU55.1
- Received：24 June 2021，
  
  Published：25 August 2023
- 稿件说明：
移动端阅览
LI Juanhong, ZHANG Pengyu, WANG Yingying. Influence of non-uniform moisture absorption and desorption on thermal conductivity of building materials[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 163-172.
DOI：

LI Juanhong, ZHANG Pengyu, WANG Yingying. Influence of non-uniform moisture absorption and desorption on thermal conductivity of building materials[J]. Journal of Civil and Environmental Engineering, 2023, 45(4): 163-172. DOI： 10.11835/j.issn.2096-6717.2021.199.

摘要

在针对含湿建材导热系数的研究中，预测模型一般假设材料含湿均匀，试验测量多采用均匀增湿方案，但实际使用过程中，受室内外湿度及气象条件影响，造成吸放湿过程中湿组分非均匀分布，相同含湿量下吸放湿过程中的材料导热系数存在差异。通过对孔隙特征不同的加气混凝土(AAC)、发泡水泥(FC)、红砖(RB)材料进行增减湿试验，控制试件在试验环境中的放置时间获得质量含湿量不均匀的试件，选择瞬态导热系数测量方案，通过分析含湿多孔建材增/减湿全过程导热系数变化趋势，研究非均匀湿分布材料导热系数变化特性。结果表明：AAC、FC、RB加湿过程导热系数相较干燥状态下分别增长了279%、266%、106%。增减湿过程中，含湿量相同的AAC导热系数差值范围约为-20.2%~63.4%，FC差值范围约为14.5%~53.3%，RB差值范围约为-18.0%~37.4%。

Abstract

At present

for the study of the thermal conductivity of building materials containing moisture

the prediction model generally assumes that the materials containing moisture are uniform

and the experimental measurement usually adopts the uniform humidification scheme. However

the indoor and outdoor humidity and meteorological conditions influence building materials in the process of actural use

causing the non-uniform distribution of moisture components in the process of moisture absorption and desorption

and the thermal conductivity of the materials is different under the same moisture content. In this paper

the moisture content of autoclaved aerated concrete (AAC)

foam cement (FC) and red brick (RB) materials with different pore characteristics were tested by analyzing the changing trend of thermal conductivity in the whole process of moisture-increasing and moisture-reducing

the changing characteristics of thermal conductivity in non-uniform moisture-distributing materials were studied. The results show that the thermal conductivity of AAC

FC and RB in the humidification process increases by 279%

266% and 106%

respectively

compared with that in the dry state. The difference value of thermal conductivity of ACC with the same moisture content in humidification process is about -20.2%~63.4%

the difference value of FC is about 14.5%~53.3%

and the difference vaule of RB is about -18.0%~37.4%.

关键词

Keywords

references

民用建筑热工设计规范 : GB 50176—2016 [S]. 北京 : 中国建筑工业出版社 , 2017 .

Code for thermal design of civil building : GB 50176—2016 [S]. Beijing : China Architecture & Building Press , 2017 . (in Chinese)

公共建筑节能设计标准 : GB 50189—2015 [S]. 北京 : 中国建筑工业出版社 , 2015 .

Design standard for energy efficiency of public buildings : GB 50189—2015 [S]. Beijing : China Architecture & Building Press , 2015 . (in Chinese)

KONG F H , ZHANG Q L . Effect of heat and mass coupled transfer combined with freezing process on building exterior envelope [J]. Energy and Buildings , 2013 , 62 : 486 - 495 .

XU Y G , LU M , JIA Z L . Effect of different initial moisture contents on the characteristics of coupled heat and moisture transfer of a reinforced concrete-EPS thermal insulation composite wall in Harbin [J]. Advanced Materials Research , 2011 , 250/251/252/253 : 3044 - 3049 .

CAMPANALE M , DEGANELLO M , MORO L . Effect of moisture movement on tested thermal conductivity of moist aerated autoclaved concrete [J]. Transport in Porous Media , 2013 , 98 ( 1 ): 125 - 146 .

JIN H Q , YAO X L , FAN L W , et al . Experimental deter mination and fractal modeling of the effective thermal conductivity of autoclaved aerated concrete: Effects of moisture content [J]. International Journal of Heat and Mass Transfer , 2016 , 92 : 589 - 602 .

SHEN Y Q , XU P , QIU S X , et al . A generalized thermal conductivity model for unsaturated porous media with fractal geometry [J]. International Journal of Heat and Mass Transfer , 2020 , 152 : 119540 .

马超 . 多孔建筑材料内部湿分布及湿传递对导热系数影响研究 [D]. 西安 : 西安建筑科技大学 , 2017 .

MA C . Research on effect of moisture distribution and transfer on thermal conductivity of porous building materials [D]. Xi,an: Xi,an University of Architecture and Technology , 2017 . (in Chinese)

黄津津 . 含湿量对轻质保温混凝土导热系数影响的实验研究 [D]. 西安 : 西安建筑科技大学 , 2020 .

HUANG J J . Experimental study on the influence of moisture content on thermal conductivity of lightweight insulating concrete [D]. Xi,an: Xi,an University of Architecture and Technology , 2020 . (in Chinese)

CHEN Z Q , SHI M H . Study of heat and moisture migration properties in porous building materials [J]. Applied Thermal Engineering , 2005 , 25 ( 1 ): 61 - 71 .

BONACINA C , CAMPANALE M , MORO L . Analytical and experimental investigations on the heat transfer properties of light concrete [J]. International Journal of Thermophysics , 2003 , 24 ( 5 ): 1407 - 1414 .

SINGH A K , CHAUDHARY D R . Evaluation of heat and moisture transfer properties in a frozen-unfrozen water-soil system [J]. International Journal of Heat and Mass Transfer , 1995 , 38 ( 12 ): 2297 - 2303 .

BOUKHATTEM L , BOUMHAOUT M , HAMDI H , et al . Moisture content influence on the thermal conductivity of insulating building materials made from date palm fibers mesh [J]. Construction and Building Materials , 2017 , 148 : 811 - 823 .

BELKHARCHOUCHE D , CHAKER A . Effects of moisture on thermal conductivity of the lightened construction material [J]. International Journal of Hydrogen Energy , 2016 , 41 ( 17 ): 7119 - 7125 .

NGUYEN L H , BEAUCOUR A L , ORTOLA S , et al . Experimental study on the thermal properties of lightweight aggregate concretes at different moisture contents and ambient temperatures [J]. Construction and Building Materials , 2017 , 151 : 720 - 731 .

GAO Y , DONG S Y , WANG C , et al . Effect of thermal intensity and initial moisture content on heat and moisture transfer in unsaturated soil [J]. Sustainable Cities and Society , 2020 , 55 : 102069 .

CAO D F , SHI B , LOHEIDE S P , et al . Investigation of the influence of soil moisture on thermal response tests using active distributed temperature sensing (A-DTS) technology [J]. Energy and Buildings , 2018 , 173 : 239 - 251 .

LIU L L , CAI G J , LIU X Y . Investigation of thermal conductivity and prediction model of recycled tire rubber-sand mixtures as lightweight backfill [J]. Construction and Building Materials , 2020 , 248 : 118657 .

KHOUKHI M . The combined effect of heat and moisture transfer dependent thermal conductivity of polystyrene insulation material: Impact on building energy performance [J]. Energy and Buildings , 2018 , 169 : 228 - 235 .

YANG W , LIU J P , WANG Y Y , et al . Experimental study on the thermal conductivity of aerogel-enhanced insulating materials under various hygrothermal enviro nments [J]. Energy and Buildings , 2020 , 206 : 109583 .

HE Y P , DONADIO D , GALLI G . Morphology and temperature dependence of the thermal conductivity of nanoporous SiGe [J]. Nano Letters , 2011 , 11 ( 9 ): 3608 - 3611 .

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Thermal conductivity and microstructure analysis of cemented calcareous sand with different cement contents

Simulation of heat transfer characteristics of vertical U-shaped buried tubes

Influence of temperature and moisture content on the thermal conductivity of building materials

Thermal conductivity test of adobe materials with different moisture content and its effect on building energy consumption

Related Author

MO Hongyan

GU Jianxiao

ZENG Zhaotian

FU Huili

LIANG Zhen

ZENG Shasha

Guang Jin

Ziye Lu

Related Institution

Guangxi Key Laboratory of Geotechnical Mechanics and Engineering, Guilin University of Technology

College of Architecture and Energy Engineering, Wenzhou University of Technology

AI问答

Address：Journals Department, Chongqing University, 174 Shazhengjie, Chongqing 400044, P.R.China Postal code：400044
Tel：+86-23-65111322 Email：xuebao@cqu.edu.cn
Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19 京公网安备11010802024621
It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.

⁰