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Constant temperature induced stresses in evacuated enclosures for high performance flat plate solar thermal collectors
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Henshall, Paul, Eames, Philip C., Arya, Farid, Hyde, Trevor, Moss, Roger W. and Shire, G. S. F. (2016) Constant temperature induced stresses in evacuated enclosures for high performance flat plate solar thermal collectors. Solar Energy, 127 . pp. 250-261. doi:10.1016/j.solener.2016.01.025 ISSN 0038-092X.
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Official URL: http://dx.doi.org/10.1016/j.solener.2016.01.025
Abstract
A flat-plate solar thermal collector’s efficiency can be much improved if the enclosure in which the solar absorber is housed can be evacuated. This would result in a high performance, architecturally versatile solar thermal collector capable of supplying clean energy efficiently for use in applications including residential water and space heating. This paper focuses on the design of evacuated enclosures for flat-plate solar collectors, in which the solar absorber is completely surrounded by a thin layer (4-10mm) of thermally insulating vacuum, resulting in a thin solar thermal collector (depth < 20mm). The expectations, requirements and applications of these solar collectors are discussed along with a description of the enclosure concept under consideration. Potential seal materials are identified and their limitations discussed. Finite element modelling results are presented of a study investigating how such enclosures are mechanically stressed when subject to atmospheric pressure loading and differential thermal expansion of dissimilar components. Finite element model predictions are validated against preliminary experimental strain measurements for existing experimental enclosures. It is demonstrated that with a suitably low temperature sealing process vacuum enclosure concepts can successfully withstand imposed stresses
| Item Type: | Journal Article | ||||||||||
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| Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
| Library of Congress Subject Headings (LCSH): | Renewable energy sources , Solar thermal energy, Clean energy , Hot-water heating | ||||||||||
| Journal or Publication Title: | Solar Energy | ||||||||||
| Publisher: | Elsevier Ltd. | ||||||||||
| ISSN: | 0038-092X | ||||||||||
| Official Date: | April 2016 | ||||||||||
| Dates: |
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| Volume: | 127 | ||||||||||
| Page Range: | pp. 250-261 | ||||||||||
| DOI: | 10.1016/j.solener.2016.01.025 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
| Date of first compliant deposit: | 3 March 2016 | ||||||||||
| Date of first compliant Open Access: | 3 March 2016 | ||||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||||
| Grant number: | EP/K009915/1 |
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