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Data for Performance of evacuated flat plate solar thermal collectors
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Moss, Roger W., Shire, Stan, Henshall, Paul, Arya, Farid, Eames, Phil and Hyde, Trevor (2018) Data for Performance of evacuated flat plate solar thermal collectors. [Dataset]
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WRAP_106468.zip - Published Version Available under License Creative Commons Attribution 4.0. Download (28Mb) |
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PDF (Readme description of data files)
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Official URL: http://wrap.warwick.ac.uk/106468
Abstract
Heat losses from a flat panel solar collector can be significantly reduced by lowering the internal pressure to <0.5 Pa. Compared with conventional collectors, the resulting increase in efficiency is predicted to give a significant gain in annual heat output in the context of a temperate climate with low median irradiance.
Two experimental collectors were built and tested to investigate theoretical aspects of evacuated flat plates and develop appropriate technological solutions. One had a metal tray to the rear, the other used two sheets of glass. An array of pillars supports the glass against atmospheric pressure. The experimental procedure was designed to minimise measurement uncertainty. Testing under a solar simulator, with and without a vacuum, showed a sudden drop in heat loss as the pressure was reduced below 0.5 Pa. When evacuated the heat loss coefficient fell from 7.43 to 3.65 W/m2 K and the efficiency at a nominal test condition of ΔT = 60 °C, G = 1000 W/m2 increased from 36% to 56%. Heat losses from absorber to glass were within 9% of the predicted level. This demonstrates that the heat loss mechanism is well understood.
Item Type: | Dataset | ||||||||||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||||
Type of Data: | Zip | ||||||||||||
Library of Congress Subject Headings (LCSH): | Solar collectors, Plates (Engineering) -- Thermal properties | ||||||||||||
Publisher: | University of Warwick, School of Engineering | ||||||||||||
Official Date: | 31 July 2018 | ||||||||||||
Dates: |
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Status: | Not Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Media of Output (format): | .jpg | ||||||||||||
Copyright Holders: | University of Warwick | ||||||||||||
Description: | This code was written in Matlab r2017a but is not in any sense version - specific. Typically a script file will either produce a single figure or is designed to be run in sections, producing one graph after another. The function files are almost always called by script files. Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. |
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Date of first compliant deposit: | 1 October 2018 | ||||||||||||
Date of first compliant Open Access: | 2 October 2018 | ||||||||||||
RIOXX Funder/Project Grant: |
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