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Movement and mechanical stresses in sealed, flat plate solar collectors
Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology.
2012 (English)In: Solar Energy, ISSN 0038-092X, Vol. 86, no 1, 339-350 p.Article in journal (Refereed) Published
Abstract [en]

This article describes movements and mechanical stresses in sealed, gas-filled, flat plate solar collectors. The advantage of a sealed space between a collector absorber and glass cover is that it (i) eliminates the influence of humidity condensation and dust and (ii) it lowers the heat losses when the enclosed space is filled with a suitable gas at normal pressure. However as the solar collector temperature varies, volume and pressure changes cause movement and mechanical stresses. In this study, the finite element method was used to determine movements and mechanical stresses. Several geometries were analyzed and it was found that the stresses in the investigated collectors are a factor 2–4 below the critical stress levels. Furthermore, it was found to be possible to reduce the stresses and improve the factor of safety by (i) using a larger area and/or reducing the distance between the glass and the absorber and/or (ii) changing the length and width so the tubes are longer.

Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 86, no 1, 339-350 p.
Keyword [en]
Solar collectors; Modelling; Mechanical stresses; Heated cavity
National Category
Energy Engineering
Research subject
Energi, skog och byggd miljö
Identifiers
URN: urn:nbn:se:du-6038DOI: 10.1016/j.solener.2011.10.005ISI: 000300459600036OAI: oai:dalea.du.se:6038DiVA: diva2:520478
Funder
Knowledge Foundation
Available from: 2011-11-03 Created: 2011-11-03 Last updated: 2014-09-25Bibliographically approved

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Vestlund, JohanRönnelid, Mats
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
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  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf