- Author
-
Thomas, W. C.
- Title
- Solar Collector Test Procedures: Development of a Method to Refer Measured Efficiencies to Standardized Test Conditions. Final Report. 1977-1980.
- Coporate
- Virginia Polytechnic Institute and State University, Blacksburg
- Sponsor
- National Bureau of Standards, Washington, DC
- Report
-
NBS GCR 84-459; VPI-E-80-23
February 1984
- Distribution
- Available from National Technical Information Service
- Contract
- NBS-G8-9022
- Keywords
-
tests; efficiency; performance tests
|
solar collectors
- Identifiers
- solar collectors
- Abstract
- An analytical procedure has been developed for referring collector efficiency measurements, obtained under different test conditions, to a common, or 'standard' set of conditions. The procedure applies to flat-plate liquid-type collectors of conventional tube-in-sheet design. The basic Hottel-Whillier-Bliss theory is used with appropriate extensions to account for serpentine flow configurations and glazing materials with high infrared transmittance. The procedure includes a systematic method for deriving two invariant collector parameters directly from ASHRAE Standard 93-77 test results. The two parameters selected are the plate absorptance and back loss coefficient. A set of standard conditions is recommended which corresponds to favorable test conditions.