End-clearance effects on rectangular-honeycomb solar collectors
Results are reported of an experimental program to measure the effects of gaps between a honeycomb core and its coverglass and absorber plate. Nusselt numbers up to values of 2 vs Rayleigh number are reported for gaps of 0, 1.5, 2.3, 3.0, and 4.6 mm above and 0 and 1.5 mm below a 19 mm thick honeycomb core with 4.69 x 40.3 mm rectangular cells. The nontranspired honeycomb system was heated from below and oriented at 0/sup 0/, 15/sup 0/, and 30/sup 0/ from the horizontal with the long dimension of the cells running horizontally. The results indicate that a well-designed honeycomb core will give good performance in a solar collector even with clearance gaps of 1.5 mm above and/or below the core.
- Research Organization:
- Univ. of California, Los Angeles
- OSTI ID:
- 7269804
- Journal Information:
- Sol. Energy; (United States), Journal Name: Sol. Energy; (United States) Vol. 18:3; ISSN SRENA
- Country of Publication:
- United States
- Language:
- English
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