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Heat transfer evaluation of a window with a ”hot box” set-up in a 18th century stone building by using COMSOL software
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science.
2019 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Sustainable development
Sustainable development according to the University's criteria is not relevant for the essay/thesis
Abstract [en]

The hot box technique is an experimental method to achieve the U-value of elements in stationary conditions; however, it is not always possible to work in stationary conditions in real world. This thesis consisted of evaluating the heat transfer of a window of a historical building with a unique hot box set-up. The window had a low emissivity plastic film to improve thermal efficiency, and the hot box was unique because the outside temperature could not be controlled. The applicability of the hot box technique to dynamic conditions was assessed using COMSOL Multiphysics 5.3. COMSOL Multiphysics is a finite element method solver software with a heat transfer module. Two heat transfer simulations were conducted in 2D based on the indoor and outdoor temperature when the hot box was in operation. First, a stationary study was carried when the outdoor temperature remained stable for 1 day. Then, the study was extended to a transient study to analyze in detail the effect of the external temperature fluctuations for 5 days. The results indicate that a cautious approach should be taken when applying the hot box technique under transient conditions, but that stationary conditions could not be achieved during one day. Nevertheless, the reliability of the simulation solution could have improved more.

Place, publisher, year, edition, pages
2019. , p. 42
Keywords [en]
window, hot box, simulation, COMSOL, outdoor, dynamic
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hig:diva-29705OAI: oai:DiVA.org:hig-29705DiVA, id: diva2:1321392
Subject / course
Energy systems
Educational program
Energy systems – master’s programme (one year) (swe or eng)
Supervisors
Examiners
Available from: 2019-06-25 Created: 2019-06-07 Last updated: 2019-06-25Bibliographically approved

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fulltext(12604 kB)19 downloads
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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
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