Ulster University Logo

Constant temperature induced stresses in evacuated enclosures for high performance flat plate solar thermal collectors

Henshall, Paul, Eames, Philip, Arya, Farid, Hyde, Trevor, Moss, Roger and Shire, Stan (2016) Constant temperature induced stresses in evacuated enclosures for high performance flat plate solar thermal collectors. Solar Energy, 127 . 250 - 261. [Journal article]

[img] Text - Supplemental Material
Restricted to Repository staff only

234kB
[img] Text - Accepted Version
3MB

URL: http://www.sciencedirect.com/science/article/pii/S0038092X16000475

DOI: 10.1016/j.solener.2016.01.025

Abstract

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 hot 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 (4-10 mm) of thermally insulating vacuum, resulting in a thin solar thermal collector (depth < 20 mm). 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 examined. Finite element modelling results are presented of a study investigating how the glass cover of 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 the designed enclosure can successfully withstand imposed stresses.

Item Type:Journal article
Keywords:Stress, Vacuum, Solar Thermal, Renewable Energy
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute > Centre for Sustainable Technologies (CST)
Built Environment Research Institute
ID Code:35982
Deposited By: Dr Trevor Hyde
Deposited On:04 Oct 2016 08:55
Last Modified:08 Oct 2016 16:43

Repository Staff Only: item control page