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The Impact of Circumsolar Diffuse Radiation on the Numerical Computation and Forecasting of DNI

Conference ·
DOI:https://doi.org/10.1063/5.0169677· OSTI ID:2279170
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Weather Research and Forecasting model with solar extensions (WRF-Solar) uses the Fast All-sky Radiation Model for Solar applications (FARMS) to predict solar radiation from the forecasted atmospheric gases, aerosols, and clouds. The Beer-Bouguer-Lambert law utilized by FARMS as well as other radiative transfer models assumes Direct Normal Irradiance (DNI) is a narrow beam only covering the sun disk. This assumption is interpreted differently in solar observations by pyrheliometers where the circumsolar diffuse radiation is accounted. This study precisely computes circumsolar diffuse radiation in all-sky conditions using a radiative transfer model based on a parameterization of precomputed cloud transmittance and reflectance. The model is implemented in WRF-Solar to provide day-ahead DNI forecast in the north America. The computation and forecasting of DNI is compared with the Beer-Bouguer-Lambert law to understand the impact of circumsolar diffuse radiation.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
DOE Contract Number:
AC36-08GO28308
OSTI ID:
2279170
Report Number(s):
NREL/CP-5D00-88471; MainId:89250; UUID:90a1aaba-d985-44ff-8acb-786cba4b8a8b; MainAdminID:71474
Resource Relation:
Conference: Presented at SolarPACES: Solar Power & Chemical Energy Systems: 27th International Conference on Concentrating Solar Power and Chemical Energy Systems, 27 September - 1 October 2021
Country of Publication:
United States
Language:
English

References (13)

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Use of physics to improve solar forecast: Physics-informed persistence models for simultaneously forecasting GHI, DNI, and DHI journal February 2021
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Numerically stable algorithm for discrete-ordinate-method radiative transfer in multiple scattering and emitting layered media journal January 1988

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