Numerical and experimental study of conjugate heat transfer in a horizontal air cavity

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F18%3A43914237" target="_blank" >RIV/62156489:43410/18:43914237 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s12273-017-0403-y" target="_blank" >https://doi.org/10.1007/s12273-017-0403-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12273-017-0403-y" target="_blank" >10.1007/s12273-017-0403-y</a>

Result language

angličtina

Original language name

Numerical and experimental study of conjugate heat transfer in a horizontal air cavity

Original language description

The demand for general reduction of the energy consumption in civil engineering leads to more frequent use of insulating materials with air gaps or cavities. Heat transfer through a constructional part can be decreased by adding an air gap and low emissivity reflective foils to the structure. In the first part of this paper, the impacts of cavity thickness and inner surface emissivity on combined conduction, convection and radiation heat transfer was experimentally explored in the case of constructional part with a horizontal cavity subjected to constant downward heat flux. The heat flow meter Netzsch HFM 436 Lambda was used for steady-state measurements. Results suggest that the studied parameters seriously affect the combined heat transfer in the composed structure. In the second part the paper reports the numerical study of two-dimensional conjugate heat transfer in closed horizontal cavity having air as the intervening medium. Numerical models validated by related experimental results were performed to further investigate the effect of radiation heat transfer. It was found that in general, the total heat flux through the composed structure decreases with increasing air cavity thickness, which is significant especially when low emissivity inner surfaces are taking into account. The direction of heat flow (downward or upward heat flow) has a significant impact on the convection heat transfer. An important contribution from the present work is the analysis of the optimal thickness of the cavity at different boundary conditions. The optimal thickness of the enclosure with low emissivity surfaces is 16 mm when subjected to upward heat flux.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

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

Name of the periodical

Building Simulation

ISSN

1996-3599

e-ISSN

—

Volume of the periodical

11

Issue of the periodical within the volume

2

Country of publishing house

CN - CHINA

Number of pages

8

Pages from-to

339-346

UT code for WoS article

000424029400010

EID of the result in the Scopus database

2-s2.0-85041440340