Calculation procedure for collectors with a honeycomb cover of rectangular cross section
- Fraunhofer-Inst. for Solar Energy Systems, Freiburg (Germany)
For a highly efficient collector with honeycomb cover an optimization procedure has to take into account a lot of parameters like material choice, geometric dimensions, cell wall thickness, and aspect ratios of the honeycomb. An approximate, but comprehensive theoretical description of the optical properties and the heat transport within a honeycomb absorber system is given and discussed in the paper. Selective absorbers and air gaps with convecting air can be treated within the model. Solar transmittance and heat transport are treated with a consistent model, which in principle needs only film data and the geometric parameters as input. Theoretical results compare quite favorable with experimental data from honeycomb structures. The main innovative features of the model are its use of an effective optical thickness, and the inclusion of both, convective boundary conditions and solar absorption, in a coupled mode analysis leading to an analytical solution.
- OSTI ID:
- 5148023
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 48:6; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
FLAT PLATE COLLECTORS
HONEYCOMB STRUCTURES
PERFORMANCE
ABSORPTION
CALCULATION METHODS
HEAT TRANSFER
MATHEMATICAL MODELS
NATURAL CONVECTION
OPTICAL PROPERTIES
SPECTRALLY SELECTIVE SURFACES
CONVECTION
ENERGY TRANSFER
EQUIPMENT
MASS TRANSFER
MECHANICAL STRUCTURES
PHYSICAL PROPERTIES
SOLAR COLLECTORS
SOLAR EQUIPMENT
SORPTION
SURFACES
141000* - Solar Collectors & Concentrators
990200 - Mathematics & Computers