Temperature limitation in evacuated solar collector tubes

The authors report a simple, inexpensive method of reducing the stagnation temperature of evacuated tubular collectors without compromising the low temperature performance. Specifically, evacuated tubes have been built in which a small quantity of a specific gas species is introduced during the evac...

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Bibliographic Details
Published in:Solar energy 1987, Vol.39 (1), p.73-75
Main Authors: Pailthorpe, B.A., Collins, R.E., O'Shea, S.
Format: Article
Language:English
Subjects:
actividad solar
activite solaire
Applied sciences
capteur solaire
colectores solares
Energy
Exact sciences and technology
modele
modelos
Natural energy
solar activity
solar collectors
Solar energy
Solar thermal conversion
temperatura
temperature
temperature control
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Summary:The authors report a simple, inexpensive method of reducing the stagnation temperature of evacuated tubular collectors without compromising the low temperature performance. Specifically, evacuated tubes have been built in which a small quantity of a specific gas species is introduced during the evacuation process, prior to sealing the tube. As the temperature of the selective surfaces increases, the gas molecules on the surface start to desorb and enter the vacuum space. The level of vacuum in the tube is thus decreased, resulting in increased thermal losses via free molecule conduction.
ISSN:0038-092X
1471-1257
DOI:10.1016/S0038-092X(87)80053-1