Directional-hemispherical solar transmittance data for plastic honeycomb-type structures
- Fraunhofer Inst. for Solar Energy Systems, Freiburg (Germany)
The directional-hemispherical (also sometimes called direct-diffuse) solar transmittance for several different honeycomb-type structures has been measured with an indoor solar simulator and a 40 cm diameter integrating sphere for incidence angles up to 70{degree}. The samples have been fabricated by commercial companies from different plastics, with cell wall thicknesses between 15 and 70 {mu}m and have approximately square or circular cell cross sections. After a discussion of the measurement errors and problems associated with a limited number of nonideal samples, a fit procedure based on a physically based transmittance model is presented and applied to the data. The resulting coefficients describe the angular and thickness dependence of the solar transmittance for each type of material. They may be used in order to feed data easily and flexibly into simulation models for solar collectors, windows or building.
- OSTI ID:
- 7149204
- Journal Information:
- Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 49:5; 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
HONEYCOMB STRUCTURES
MATHEMATICAL MODELS
OPTICAL PROPERTIES
METHYL METHACRYLATE
POLYCARBONATES
POLYETHYLENES
SULFONES
BENCH-SCALE EXPERIMENTS
DIFFUSE SOLAR RADIATION
DIRECT SOLAR RADIATION
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACID ESTERS
ESTERS
MECHANICAL STRUCTURES
METHACRYLIC ACID ESTERS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
POLYOLEFINS
RADIATIONS
SOLAR FLUX
SOLAR RADIATION
STELLAR RADIATION
141000* - Solar Collectors & Concentrators
990200 - Mathematics & Computers