Measuring the Optical Performance of Evacuated Receivers via an Outdoor Thermal Transient Test: Preprint

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Modern parabolic trough solar collectors operated at high temperatures to provide the heat input to Rankine steam power cycles employ evacuated receiver tubes along the collector focal line. High performance is achieved via the use of a selective surface with a high absorptance for incoming short-wave solar radiation and a low emittance for outgoing long-wave infrared radiation, as well as the use of a hard vacuum to essentially eliminate convective and conductive heat losses. This paper describes a new method that determines receiver overall optical efficiency by exposing a fluid-filled, pre-cooled receiver to one sun outdoors and measuring the slope ... continued below

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10 p.

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Kutscher, C.; Burkholder, F. & Netter, J. August 1, 2011.

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Modern parabolic trough solar collectors operated at high temperatures to provide the heat input to Rankine steam power cycles employ evacuated receiver tubes along the collector focal line. High performance is achieved via the use of a selective surface with a high absorptance for incoming short-wave solar radiation and a low emittance for outgoing long-wave infrared radiation, as well as the use of a hard vacuum to essentially eliminate convective and conductive heat losses. This paper describes a new method that determines receiver overall optical efficiency by exposing a fluid-filled, pre-cooled receiver to one sun outdoors and measuring the slope of the temperature curve at the point where the receiver temperature passes the glass envelope temperature (that is, the point at which there is no heat gain or loss from the absorber). This transient test method offers the potential advantages of simplicity, high accuracy, and the use of the actual solar spectrum.

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10 p.

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  • To be presented at SolarPACES 2011, 20-23 September 2011, Granada, Spain

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  • Report No.: NREL/CP-5500-52466
  • Grant Number: AC36-08GO28308
  • Office of Scientific & Technical Information Report Number: 1025058
  • Archival Resource Key: ark:/67531/metadc831270

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  • August 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • April 4, 2017, 12:58 p.m.

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Kutscher, C.; Burkholder, F. & Netter, J. Measuring the Optical Performance of Evacuated Receivers via an Outdoor Thermal Transient Test: Preprint, article, August 1, 2011; Golden, Colorado. (digital.library.unt.edu/ark:/67531/metadc831270/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.