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  • English  (3)
  • 1
    Online Resource
    Online Resource
    Parabolic Trough Optical Performance Analysis Techniques
    ASME International ; 2007
    In:  Journal of Solar Energy Engineering Vol. 129, No. 2 ( 2007-05-01), p. 147-152
    Details
    In: Journal of Solar Energy Engineering, ASME International, Vol. 129, No. 2 ( 2007-05-01), p. 147-152
    Abstract: Analysis of geometry and optical properties of solar parabolic trough collectors uses a number of specific techniques that have demonstrated to be useful tools in prototype evaluation. These are based on photogrammetry, flux mapping, ray tracing, and advanced thermal testing. They can be used to assure the collector quality during construction and for acceptance tests of the solar field. The methods have been applied on EuroTrough collectors, cross checked, and compared. This paper summarizes results in collector shape measurement, flux measurement, ray tracing, and thermal performance analysis for parabolic troughs. It is shown that the measurement methods and the parameter analysis give consistent results. The interpretation of the results and their annual evaluation give hints on identified relevant improvement potentials for the following generation of solar power plant collectors.
    Type of Medium: Online Resource
    ISSN: 0199-6231 , 1528-8986
    URL: Article
    DOI: 10.1115/1.2710249
    Language: English
    Publisher: ASME International
    Publication Date: 2007
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Experimental Verification of Optical Modeling of Parabolic Trough Collectors by Flux Measurement
    ASME International ; 2009
    In:  Journal of Solar Energy Engineering Vol. 131, No. 1 ( 2009-02-01)
    Details
    In: Journal of Solar Energy Engineering, ASME International, Vol. 131, No. 1 ( 2009-02-01)
    Abstract: In order to optimize the solar field output of parabolic trough collectors (PTCs), it is essential to study the influence of collector and absorber geometry on the optical performance. The optical ray-tracing model of PTC conceived for this purpose uses photogrammetrically measured concentrator geometry in commercial Monte Carlo ray-tracing software. The model has been verified with measurements of a scanning flux measurement system, measuring the solar flux density distribution close to the focal line of the PTC. The tool uses fiber optics and a charged coupled device camera to scan the focal area of a PTC module. Since it is able to quantitatively detect spilled light with good spatial resolution, it provides an evaluation of the optical efficiency of the PTC. For comparison of ray-tracing predictions with measurements, both flux maps and collector geometry have been measured under identical conditions on the Eurotrough prototype collector at the Plataforma Solar de Almería. The verification of the model is provided by three methods: the comparison of measured intercept factors with corresponding simulations, comparison of measured flux density distributions with corresponding ray-tracing predictions, and comparison of thermographically measured temperature distribution on the absorber surface with flux density distribution predicted for this surface. Examples of sensitivity studies performed with the validated model are shown.
    Type of Medium: Online Resource
    ISSN: 0199-6231 , 1528-8986
    URL: Article
    DOI: 10.1115/1.3027507
    Language: English
    Publisher: ASME International
    Publication Date: 2009
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Experimental Analysis of Overall Thermal Properties of Parabolic Trough Receivers
    ASME International ; 2008
    In:  Journal of Solar Energy Engineering Vol. 130, No. 2 ( 2008-05-01)
    Details
    In: Journal of Solar Energy Engineering, ASME International, Vol. 130, No. 2 ( 2008-05-01)
    Abstract: The heat loss of a receiver in a parabolic trough collector plays an important role in collector performance. A number of methods have been used to measure the thermal loss of a receiver tube depending on its operating temperature. This paper presents methods for measuring receiver heat losses including field measurements and laboratory setups both based on energy balances from the hot inside of the receiver tube to the ambient. Further approaches are presented to measure and analyze the temperature of the glass envelope of evacuated receivers and to model overall heat losses and emissivity coefficients of the receiver. Good agreement can be found between very different approaches and independent installations. For solar parabolic trough plants operating in the usual 390°C temperature range, the thermal loss is around 300W∕m receiver length.
    Type of Medium: Online Resource
    ISSN: 0199-6231 , 1528-8986
    URL: Article
    DOI: 10.1115/1.2888756
    Language: English
    Publisher: ASME International
    Publication Date: 2008
    Location Call Number Limitation Availability
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    Online Resource
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