Development of a new flat stationary evacuated CPC-collector for process heat applications
- Bavarian Center for Applied Energy Research (ZAE Bayern), Technology for Energy Systems and Renewable Energies, Walther-Meissner-Str. 6, 85748 Garching (Germany)
For the economical supply of solar process heat at temperatures between 120 and 150 C a new non-tracking, flat, low-concentrating collector has been developed. The new collector is an edge ray collector with a concentration of 1.8 and inert gas filling, existing of parallel mounted absorber-reflector units, aligned in east-west direction. The basic concept is the integration of an absorber tube and reflectors inside a low pressure enclosure. Asymmetrical reflectors below the headers with a concentration of 0.6X provide extra radiation and prevent longitudinal radiation losses. To suppress heat losses due to gas-convection inside, air or inert gas like krypton at a pressure below 10 mbar is used. A prototype, with an aperture area of 2.0 m{sup 2}, was tested in Munich and showed efficiencies of about 50% for krypton at 0.01 bar at a temperature of 150 C with a radiation of 1000 W/m{sup 2} (900 W/m{sup 2} direct, ambient temperature 20 C). (author)
- OSTI ID:
- 21328650
- Journal Information:
- Solar Energy, Vol. 84, Issue 7; Other Information: Elsevier Ltd. All rights reserved; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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