Off-normal experimental verification of numerically calculated incidence angle modifiers for evacuated tube integral storage solar collectors
- Colorado State Univ., Fort Collins, CO (United States). Solar Energy Applications Lab.
Incidence angle modifiers (IAMs) are required to account for the change in collector transmittance-absorptance product, ({tau}{alpha}), as the solar radiation angle of incidence varies. IAMs for cylindrical absorber tubular collectors such as the evacuated tube integral storage collector behave in a similar fashion to those for flat-plate collectors for incidence angle variation along the longitudinal axis, but quite differently for incidence angle variation along the transverse axis. Further, there is currently no analytical method which can be used to accurately determine the IAMs for such asymmetric collectors. A Monte Carlo ray-tracing technique was used to compute the IAMs for various collector configurations at all possible angles of incidence. The results from the ray-trace routine compare well with experimental results.
- OSTI ID:
- 116244
- Report Number(s):
- CONF-950336--; ISBN 0-7918-1300-2
- Country of Publication:
- United States
- Language:
- English
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