| Description |
1 online resource (17 p.) : col. ill. |
| Series |
NREL/TP ; 3B10-52194 |
|
NREL/TP ; 3B10-52194.
|
| System Details |
Full text available via Internet in .pdf format. Adobe Acrobat Reader required. |
| Note |
Title from title screen (viewed August 22, 2011). |
|
"July 2011." |
| Bibliography |
Includes bibliographical references (p. 17). |
| Summary |
The uncertainty of measuring solar irradiance is fundamentally important for solar energy and atmospheric science applications. Without an uncertainty statement, the quality of a result, model, or testing method cannot be quantified, the chain of traceability is broken, and confidence cannot be maintained in the measurement. Measurement results are incomplete and meaningless without a statement of the estimated uncertainty with traceability to the International System of Units (SI) or to another internationally recognized standard. This report explains how to use International Guidelines of Uncertainty in Measurement (GUM) to calculate such uncertainty. The report also shows that without appropriate corrections to solar measuring instruments (solar radiometers), the uncertainty of measuring shortwave solar irradiance can exceed 4% using present state-of-the-art pyranometers and 2.7% using present state-of-the-art pyrheliometers. Finally, the report demonstrates that by applying the appropriate corrections, uncertainties may be reduced by at least 50%. The uncertainties, with or without the appropriate corrections might not be compatible with the needs of solar energy and atmospheric science applications; yet, this report may shed some light on the sources of uncertainties and the means to reduce overall uncertainty in measuring solar irradiance. |
| Funding |
DE-AC36-08GO28308 3B10.3000 |
| Subject |
Solar radiation -- Measurement.
|
|
Uncertainty -- Standards.
|
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Radiometers -- Calibration.
|
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Pyrheliometer -- Calibration.
|
| Added Author |
National Renewable Energy Laboratory (U.S.)
|
| Gpo Item No. |
0430-P-03 (online) |
| Sudoc No. |
E 9.16:NREL/TP-3 B 10-52194 |
|
