Numerical study of heat losses of building walls containing reflective foils
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU145457" target="_blank" >RIV/00216305:26110/22:PU145457 - isvavai.cz</a>
Result on the web
<a href="https://journals.sagepub.com/doi/full/10.1177/1420326X221082467" target="_blank" >https://journals.sagepub.com/doi/full/10.1177/1420326X221082467</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1177/1420326X221082467" target="_blank" >10.1177/1420326X221082467</a>
Alternative languages
Result language
angličtina
Original language name
Numerical study of heat losses of building walls containing reflective foils
Original language description
In external building walls, air cavities are occasionally used to reduce heat losses. Closed air cavities improve the thermal resistance of building structures, especially when the inner surfaces of the cavities are covered with low-emissivity materials such as metalized foils. With these structures, the problem of accurate determination of radiative heat arises. In this contribution, radiative heat transfer is determined by the precise algebraic radiosity method, so far not applied in the field of thermal building technology. Radiative heat computed by the radiosity method has been coupled with convective heat evaluated by the correlation functions of the Nusselt numbers. The combined radiative-convective heat transfer through a sandwich wall containing an air cavity with metalized surfaces (aluminium foils) has been analysed. A computer program has been developed to quantify the real insulation effect of reflective aluminium foils. The sandwich building structure has been subjected to real one-month winter conditions as defined by official meteorological data valid for the city of Brno. The software is based on an iterative procedure that solves the combined radiative-convective steady heat transfers by means of one-day average temperatures and wind speeds. Various arrangements of foils in the cavity have been explored to achieve the maximum value of thermal resistance. The corresponding heat savings have been quantified. The best configuration of foils in the cavity has been found to ensure maximum thermal savings. The insulation system that uses foils has been compared to the system that uses mineral wool. The comparison was based on economic considerations.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
<a href="/en/project/GA13-03403S" target="_blank" >GA13-03403S: Morphology analysis of fracture surfaces and its consequences for stability of large civil engineering constructions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
INDOOR AND BUILT ENVIRONMENT
ISSN
1420-326X
e-ISSN
1423-0070
Volume of the periodical
31
Issue of the periodical within the volume
7
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
1932-1948
UT code for WoS article
000798933200001
EID of the result in the Scopus database
2-s2.0-85130582892