Effect of Moisture Content on Thermal Properties of Porous Building Materials
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- 作者：Václav Kočí ; Eva Vejmelková ; Monika Čáchová…
- 关键词：Building envelopes ; Climatic conditions ; Energy balance ; Moisture content ; Thermal properties
- 刊名：International Journal of Thermophysics
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：38
- 期：2
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Condensed Matter Physics; Classical Mechanics; Industrial Chemistry/Chemical Engineering; Physical Chemistry;
- 出版者：Springer US
- ISSN：1572-9567
- 卷排序：38
文摘
The thermal conductivity and specific heat capacity of characteristic types of porous building materials are determined in the whole range of moisture content from dry to fully water-saturated state. A transient pulse technique is used in the experiments, in order to avoid the influence of moisture transport on measured data. The investigated specimens include cement composites, ceramics, plasters, and thermal insulation boards. The effect of moisture-induced changes in thermal conductivity and specific heat capacity on the energy performance of selected building envelopes containing the studied materials is then analyzed using computational modeling of coupled heat and moisture transport. The results show an increased moisture content as a substantial negative factor affecting both thermal properties of materials and energy balance of envelopes, which underlines the necessity to use moisture-dependent thermal parameters of building materials in energy-related calculations.