Use of measured aerosol optical depth and precipitable water to model clear sky irradiance

Mark M. Mikofski, Clifford W. Hansen, William F. Holmgren, Gregory M. Kimball

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Predicted clear sky irradiance depends on atmospheric composition as well as solar position and extraterrestrial irradiance. The effects on clear sky irradiance of year to year variations in atmospheric composition were studied using measurements of aerosol optical depth (AOD) and precipitable water (Pwat) at seven locations in the United States. Three clear sky models were evaluated, including one that uses Linke turbidity (TL). This model was evaluated using historical, static TL as well as updated values derived from real-time AOD and Pwat measurements. The average annual error in predicted clear sky irradiance using static TL did not differ significantly from year to year. Annual average error in predicted GHI was less than 5% for all models with no significant difference between models. The model with static TL had the lowest DNI errors, and the Bird model had the smallest GHI error but the largest DNI error. On average DNI and GHI were under-predicted.

Original languageEnglish (US)
Title of host publication2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages110-116
Number of pages7
ISBN (Electronic)9781509056057
DOIs
StatePublished - 2017
Event44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States
Duration: Jun 25 2017Jun 30 2017

Publication series

Name2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
Volume2017-June

Other

Other44th IEEE Photovoltaic Specialist Conference, PVSC 2017
Country/TerritoryUnited States
CityWashington
Period6/25/176/30/17

Keywords

  • Aerosol optical depth
  • Clear sky
  • Irradiance
  • Precipitable water

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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