1980
DOI: 10.1115/1.3266115
|View full text |Cite
|
Sign up to set email alerts
|

Incidence-Angle Modifier and Average Optical Efficiency of Parabolic Trough Collectors

Abstract: The incidence-angle modifier for parabolic troughs is investigated in order to clarify the connection between collector tests and prediction of long-term energy delivery by collector arrays. The optical efficiency of a parabolic trough collector decreases with incidence angle for several reasons: the decreased transmission of the glazing and the absorption of the absorber; the increased width of the solar image on the receiver; and the spillover of the radiation from troughs of finite length. In order to be ab… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

1
18
0

Year Published

1980
1980
2020
2020

Publication Types

Select...
5
2
1

Relationship

2
6

Authors

Journals

citations
Cited by 68 publications
(20 citation statements)
references
References 6 publications
1
18
0
Order By: Relevance
“…Optical losses are due to the reductions in intercept factor (that fraction of rays incident upon the aperture that reach the receiver) and receiver glazing transmittance and receiver absorptance as incidence angles increase. Our analytical determination of the incidence-angle modifier is in good agreement with published experimental data [4].…”
Section: Thermal and Optieal Analysissupporting
confidence: 79%
See 1 more Smart Citation
“…Optical losses are due to the reductions in intercept factor (that fraction of rays incident upon the aperture that reach the receiver) and receiver glazing transmittance and receiver absorptance as incidence angles increase. Our analytical determination of the incidence-angle modifier is in good agreement with published experimental data [4].…”
Section: Thermal and Optieal Analysissupporting
confidence: 79%
“…(1) selective coating absorptance increase to 0.98; (2) selective coating emittance decreased to 0.05 (l00°C), 0.15 (300°C)*; (3) back-silvered glass reflector (reflectance increased to 0.95, reflector nonspecularity decreased to 0.5 mrad); · (4) concentrator slope error reduced to 3 mrnd; (5) evacuated annulus receiver; (6) xenon back-filled annulus receiver; These improvements are all near-term possibilites. Efforts are underway to increase reflectance through the development of stable, low-cost, back-silvered, thin glass mirrors.…”
Section: Reference Parabolic Trough and Potential Improvementsmentioning
confidence: 99%
“…Such that material properties and the intercept factor are the major factors determining the optical performance of the parabolic trough system for this case when the angle of incidence is zero. Gaul and Rabl (1980) presented experimental data as well as analytical expressions for the determination of the incidence angle effects on the performance of a parabolic trough collector. Güven and Bannerot, (1986) give a detailed illustration of the different types of errors that are likely to be encountered in parabolic trough collectors.…”
Section: Introductionmentioning
confidence: 99%
“…The test setup is described in another publication [11]. The collector has a cylindrical receiver coated with black chrome.…”
Section: Tr-359 S!:el~fl~--------------------------mentioning
confidence: 99%
“…When the absorber surface is at ambient temperature, the heat loss is zero and the efficiency n equals the optical efficiency: (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) If the heat loss is not zero, an appropriate correction must be applied.…”
Section: Tr-359 S!:el~fl~--------------------------mentioning
confidence: 99%