| Description |
1 online resource (8 p.) : col. ill. |
| Series |
NREL/CP ; 5500-52466 |
|
Conference paper (National Renewable Energy Laboratory (U.S.)) ; NREL/CP-5500-52466.
|
| System Details |
Full text available via Internet in .pdf format. Adobe Acrobat Reader required. |
| Note |
Title from title screen (viewed September 26, 2011). |
|
"August 2011." |
|
"To be presented at SolarPACES 2011, Granada, Spain, September 20-23, 2011." |
| Bibliography |
Includes bibliographical references (p. 8). |
| 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. |
| Funding |
DE-AC36-08GO28308 |
| Subject |
Parabolic troughs -- Optical properties -- Testing.
|
|
Solar collectors -- Research.
|
| Added Author |
Burkholder, Frank.
|
|
Netter, Judy.
|
|
National Renewable Energy Laboratory (U.S.)
|
|
SolarPACES (Conference) (2011 : Granada, Spain)
|
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP-5500-52466 |
|
