Solar energy collection using vee-grooved surfaces

 

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dc.contributor.advisor Dutkiewicz, Ryszard Karol en_ZA
dc.contributor.author Kemper, Jens Peter en_ZA
dc.date.accessioned 2016-03-21T19:02:39Z
dc.date.available 2016-03-21T19:02:39Z
dc.date.issued 1977 en_ZA
dc.identifier.citation Kemper, J. 1977. Solar energy collection using vee-grooved surfaces. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18012
dc.description Bibliography: pages 98-103. en_ZA
dc.description.abstract The thesis presented is a study of the absorption characteristics of diffusely and specularly reflecting V-grooved surfaces. Concepts are developed for the so-called "apparent" absorptance of a V-groove cavity, as well as for the "effective" absorptance of a V-grooved surface. These concepts are formulated in closed form mathematical equations, which facilitate both the optimization of V-grooved surfaces and their engineering design. In order to verify the theoretical analysis, experiments are carried out on 34 V-grooved brass specimens. In addition, the experiments are meant to provide information about the behaviour of such surfaces used for solar energy collection. For that purpose, the specimens are exposed to simulated sunlight, and their effective absorptances, as well as their absorption efficiencies, are determined by a calorimetric method. The highlights among the results are: 1. V-grooves - carefully optimized and applied to a solar energy absorbing surface - can raise its absorptance almost to unity and improve its absorption efficiency. 2. Best performances at elevated temperatures can be expected from using metal surfaces which are provided with specular V-grooves having a small groove angle (< 30⁰). 3. The optimal groove angle is dependent on (1) the reflection properties of the surface, (2) the absorptance of the surface material, and (3) the ratio of groove depth to width of land which occurs between grooves. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Energy Research en_ZA
dc.subject.other Solar Energy en_ZA
dc.title Solar energy collection using vee-grooved surfaces en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Energy Research Centre en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Kemper, J. P. (1977). <i>Solar energy collection using vee-grooved surfaces</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Energy Research Centre. Retrieved from http://hdl.handle.net/11427/18012 en_ZA
dc.identifier.chicagocitation Kemper, Jens Peter. <i>"Solar energy collection using vee-grooved surfaces."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Energy Research Centre, 1977. http://hdl.handle.net/11427/18012 en_ZA
dc.identifier.vancouvercitation Kemper JP. Solar energy collection using vee-grooved surfaces. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Energy Research Centre, 1977 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18012 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Kemper, Jens Peter AB - The thesis presented is a study of the absorption characteristics of diffusely and specularly reflecting V-grooved surfaces. Concepts are developed for the so-called "apparent" absorptance of a V-groove cavity, as well as for the "effective" absorptance of a V-grooved surface. These concepts are formulated in closed form mathematical equations, which facilitate both the optimization of V-grooved surfaces and their engineering design. In order to verify the theoretical analysis, experiments are carried out on 34 V-grooved brass specimens. In addition, the experiments are meant to provide information about the behaviour of such surfaces used for solar energy collection. For that purpose, the specimens are exposed to simulated sunlight, and their effective absorptances, as well as their absorption efficiencies, are determined by a calorimetric method. The highlights among the results are: 1. V-grooves - carefully optimized and applied to a solar energy absorbing surface - can raise its absorptance almost to unity and improve its absorption efficiency. 2. Best performances at elevated temperatures can be expected from using metal surfaces which are provided with specular V-grooves having a small groove angle (< 30⁰). 3. The optimal groove angle is dependent on (1) the reflection properties of the surface, (2) the absorptance of the surface material, and (3) the ratio of groove depth to width of land which occurs between grooves. DA - 1977 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1977 T1 - Solar energy collection using vee-grooved surfaces TI - Solar energy collection using vee-grooved surfaces UR - http://hdl.handle.net/11427/18012 ER - en_ZA


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