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Title: Intercomparison of 51 radiometers for determining global horizontal irradiance and direct normal irradiance measurements

Accurate solar radiation measurements require properly installed and maintained radiometers with calibrations traceable to the World Radiometric Reference. This study analyzes the performance of 51 commercially available and prototype radiometers used for measuring global horizontal irradiances or direct normal irradiances. These include pyranometers, pyrheliometers, rotating shadowband radiometers, and a pyranometer with an internal shading mask deployed at the National Renewable Energy Laboratory's (NREL) Solar Radiation Research Laboratory. The radiometers in this study were deployed for one year (from April 1, 2011, through March 31, 2012), and their measurements were compared under clear-sky, partly cloudy, and mostly cloudy conditions to reference values of low estimated measurement uncertainties. The intent of this paper is to present a general overview of each radiometer's performance based on the instrumentation and environmental conditions available at NREL.
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Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0038-092X
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solar Energy; Journal Volume: 133; Related Information: Solar Energy
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
Country of Publication:
United States
47 OTHER INSTRUMENTATION global horizontal irradiance; GHI; direct normal irradiance; DNI; diffuse horizontal irradiance; DHI; pyranometer; pyrheliometer; rotating shadowband radiometer; RSR