Theoretical and experimental study of efficiency factor, heat transfer and thermal heat loss coefficients in solar air collectors with selective and nonselective absorbers
✍ Scribed by A. Hachemi
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 111 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0363-907X
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✦ Synopsis
The thermal heat performance of a solar air collector depends strongly on the thermal heat loss and the e$ciency factor. In order to increase these performances, it is necessary to use a solar air collector which is well insulated and where the #uid #ow is fully developed turbulent #ow. It needs a high heat transfer between the absorber plate and the #uid to decrease the absorber-plate temperature and hence the heat loss by radiation from the absorber to the ambient. This increases the e$ciency factor. In the present paper, the heat loss and e$ciency factor are treated for solar air collectors with selective and nonselective absorber plate. It is shown that the selectivity of the absorber plate cannot play an important role in a well-insulated solar collector with a fanned system which permits a fully developed turbulent #ow and, in consequence, high heat transfer.