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Naslov:Difference between using tabulated and exact values of thermal properties of materials in numerical simulations of heat transfer through a high-performance window
Avtorji:ID Jukić, Miha (Avtor)
ID Jordan, Sabina (Avtor)
Datoteke:URL URL - Izvorni URL, za dostop obiščite https://www.witpress.com/elibrary/wit-transactions-on-engineering-sciences/124/37194
Opis: Odprti dostop
 
.pdf PDF - Predstavitvena datoteka, prenos (282,29 KB)
MD5: 323BE5B974D8C5E4679B0572B607F88D
 
Jezik:Angleški jezik
Tipologija:1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:Logo ZAG - Zavod za gradbeništvo Slovenije
Povzetek:The thermal properties of materials, primarily the thermal conductivity, are an essential input for numerical modelling of heat transfer in buildings and building components. When determining them according to relevant European standards, it is not uncommon to encounter materials for which the exact values are not appropriately specified and the tabulated values in standards are overly conservative. In such situations, the thermal conductivity of the material can be determined by measurement. However, this approach may prove inconvenient and too expensive, especially if the material in question turns out to have little influence on the overall thermal performance of the product. It is, therefore, of great interest to know how the thermal performance is affected by choosing either the accurate (measured) or the conservative (tabulated) value of the thermal conductivity. In this work, the two approaches are compared in a practical example – a high-performance window, Jelovica Jelofuture – using numerical simulations. Our study shows that modifying the thermal properties of individual materials generally leaves the thermal transmittances of the frame (Uf) and the window (UW) almost unaffected. If all of the materials considered are modified simultaneously, Uf changes by 1–2% while the change in UW remains below 1%. However, due to their small values, the calculated changes of Uf and UW may be significantly affected (further increased or reduced) by the rounding of the results according to the relevant standards. In contrast, using the tabulated value of linear thermal transmittance (Ψg) of the junction with the glazing leads to an overestimation of UW by up to 15%.
Ključne besede:thermal transmittance, numerical simulation, conductivity, tabulated and exact values, practical example
Status publikacije:Objavljeno
Verzija publikacije:Objavljena publikacija
Datum objave:31.07.2019
Založnik:WIT
Leto izida:2019
Št. strani:Str. 119-130
PID:20.500.12556/DiRROS-18335 Novo okno
UDK:620.1/.2
DOI:10.2495/MC190121 Novo okno
COBISS.SI-ID:2499943 Novo okno
Avtorske pravice:© 2019 WIT Press
Opomba:Nasl. z nasl. zaslona; Opis vira z dne 28. 11. 2019;
Datum objave v DiRROS:08.03.2024
Število ogledov:715
Število prenosov:492
Metapodatki:XML DC-XML DC-RDF
:
JUKIĆ, Miha in JORDAN, Sabina, 2019, Difference between using tabulated and exact values of thermal properties of materials in numerical simulations of heat transfer through a high-performance window. V : Materials and contact characterisation IX [na spletu]. Objavljeni znanstveni prispevek na konferenci. Wessex : WIT. 2019. p. 119–130. [Dostopano 15 april 2025]. Pridobljeno s: https://dirros.openscience.si/IzpisGradiva.php?lang=slv&id=18335
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Gradivo je del monografije

Naslov:Materials and contact characterisation IX
Kraj izida:Wessex
Založnik:WIT
Leto izida:2019
ISBN:978-1-78466-332-2
COBISS.SI-ID:2499687 Novo okno
Naslov zbirke:WIT transactions on engineering sciences
Številčenje v zbirki:ǂvol. ǂ124
ISSN zbirke:1743-3533

Licence

Licenca:Drugo
Opis:This paper will be freely available, without charge, for users to read, download, copy, distribute, print, search, link to the full text, or use for any other lawful purpose, without asking prior permission from the publisher or the author as long as the author/copyright holder is attributed.

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:toplotna prehodnost, numerične simulacije, prevodnost, tabeliranje in točne vrednosti, praktični primer


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