Application of the Lichtenecker’s Mixing Rule in Modeling the Thermal Properties of Autoclaved Aerated Concrete

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F15%3A00229793" target="_blank" >RIV/68407700:21110/15:00229793 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.4912391" target="_blank" >http://dx.doi.org/10.1063/1.4912391</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4912391" target="_blank" >10.1063/1.4912391</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Application of the Lichtenecker’s Mixing Rule in Modeling the Thermal Properties of Autoclaved Aerated Concrete

Popis výsledku v původním jazyce

Thermal conductivity is an important thermophysical parameter describing heat transport in porous building materials. It is significantly affected by the moisture content; higher water saturation degree leads to the deterioration of thermal insulation capability of building materials. The thermal conductivity is usually determined by repeated measurements for different water saturation levels. However, this procedure is very time consuming. Shortening the time necessary for the determination of thermal conductivity as a function of moisture content can be achieved by an application of convenient mixing formulas. Lichtenecker’s homogenization formula is widely used for its simplicity and the fact that the theoretical Wiener’s bounds can be expressed by choosing the Lichtenecker's coefficient k equal to -1 and 1 k values, laying in close interval [-1, 1], express the geometric transition from parallel to serial connection of heterogeneous material components' layers (matrix, air, water). This article is dealing with the assessment of an optimal coefficient k that identifies precisely the dependence of thermal conductivity of autoclaved aerated concrete (AAC) on moisture content. Data obtained by modeling is compared with measured data by means of RMSE. Under assumption of similar matrix, this approach can lead to an appropriate choice of coefficient k predicting the thermal conductivity dependence on moisture content for a wider group of AACs.

Název v anglickém jazyce

Application of the Lichtenecker’s Mixing Rule in Modeling the Thermal Properties of Autoclaved Aerated Concrete

Popis výsledku anglicky

Thermal conductivity is an important thermophysical parameter describing heat transport in porous building materials. It is significantly affected by the moisture content; higher water saturation degree leads to the deterioration of thermal insulation capability of building materials. The thermal conductivity is usually determined by repeated measurements for different water saturation levels. However, this procedure is very time consuming. Shortening the time necessary for the determination of thermal conductivity as a function of moisture content can be achieved by an application of convenient mixing formulas. Lichtenecker’s homogenization formula is widely used for its simplicity and the fact that the theoretical Wiener’s bounds can be expressed by choosing the Lichtenecker's coefficient k equal to -1 and 1 k values, laying in close interval [-1, 1], express the geometric transition from parallel to serial connection of heterogeneous material components' layers (matrix, air, water). This article is dealing with the assessment of an optimal coefficient k that identifies precisely the dependence of thermal conductivity of autoclaved aerated concrete (AAC) on moisture content. Data obtained by modeling is compared with measured data by means of RMSE. Under assumption of similar matrix, this approach can lead to an appropriate choice of coefficient k predicting the thermal conductivity dependence on moisture content for a wider group of AACs.

Druh

D - Stať ve sborníku

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GBP105%2F12%2FG059" target="_blank" >GBP105/12/G059: Kumulativní časově závislé procesy ve stavebních materiálech a konstrukcích</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014)

ISBN

978-0-7354-1287-3

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

4

Strana od-do

—

Název nakladatele

AIP Conference Proceedings

Místo vydání

New York

Místo konání akce

Rhodes, Greece

Datum konání akce

22. 9. 2014

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000355339700080