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Title: Global horizontal irradiance clear sky models : implementation and analysis.

Abstract

Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
USDOE
OSTI Identifier:
1039404
Report Number(s):
SAND2012-2389
TRN: US201209%%552
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ACCURACY; AEROSOLS; ALGORITHMS; ALTITUDE; IMPLEMENTATION; PERFORMANCE; RADIANT FLUX DENSITY; SKY; SOLAR RADIATION; VALIDATION; WATER VAPOR

Citation Formats

Stein, Joshua S., Hansen, Clifford W., and Reno, Matthew J. Global horizontal irradiance clear sky models : implementation and analysis.. United States: N. p., 2012. Web. doi:10.2172/1039404.
Stein, Joshua S., Hansen, Clifford W., & Reno, Matthew J. Global horizontal irradiance clear sky models : implementation and analysis.. United States. doi:10.2172/1039404.
Stein, Joshua S., Hansen, Clifford W., and Reno, Matthew J. Thu . "Global horizontal irradiance clear sky models : implementation and analysis.". United States. doi:10.2172/1039404. https://www.osti.gov/servlets/purl/1039404.
@article{osti_1039404,
title = {Global horizontal irradiance clear sky models : implementation and analysis.},
author = {Stein, Joshua S. and Hansen, Clifford W. and Reno, Matthew J.},
abstractNote = {Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.},
doi = {10.2172/1039404},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {3}
}

Technical Report:

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