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Measuring the optical performance of evacuated receivers via an outdoor thermal transient test : preprint / Charles Kutscher, Frank Burkholder, and Judy Netter.
- Format:
- Book
- Conference/Event
- Government document
- Author/Creator:
- Kutscher, Charles F.
- Conference Name:
- SolarPACES (Conference) (2011 : Granada, Spain)
- Series:
- Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-5500-52466.
- NREL/CP ; 5500-52466
- Language:
- English
- Subjects (All):
- Parabolic troughs--Optical properties--Testing.
- Parabolic troughs.
- Solar collectors--Research.
- Solar collectors.
- Genre:
- technical reports.
- Technical reports
- Technical reports.
- Physical Description:
- 1 online resource (8 pages) : color illustrations.
- Place of Publication:
- [Golden, Colo.] : National Renewable Energy Laboratory, [2011]
- Summary:
- 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.
- Notes:
- Title from title screen (viewed September 26, 2011).
- "August 2011."
- "To be presented at SolarPACES 2011, Granada, Spain, September 20-23, 2011."
- Includes bibliographical references (page 8).
- OCLC:
- 754657909
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