Clear Sky Irradiance Year-to-Year Variations and Trends: Preprint

Bill Marion

Clear Sky Irradiance Year-to-Year Variations and Trends: Preprint

Bill Marion

Materials Science

Research output: Contribution to conference › Paper

Abstract

Solar radiation data for seven SURFRAD stations for the period 1996-2018 show an increase in irradiance under clear skies over time, with an interannual variability of the increase. A popular implementation of a clear sky model provided modeled irradiances for comparison with the SURFRAD data under conditions screened for clear skies. The use of the clear sky model, which did not consider year-to-year variances in atmospheric turbidity, was found problematic for resolving small changes in irradiance important for determining PV system degradation over three or five years, but less problematic for a period of ten years.

Original language	American English
Number of pages	7
State	Published - 2020
Event	47th IEEE Photovoltaic Specialists Conference (PVSC 47) - Duration: 15 Jun 2020 → 21 Aug 2020

Conference

Conference	47th IEEE Photovoltaic Specialists Conference (PVSC 47)
Period	15/06/20 → 21/08/20

Bibliographical note

See NREL/CP-5K00-79547 for paper as published in proceedings

NREL Publication Number

NREL/CP-5K00-75923

Keywords

aerosols
clear-sky
data
irradiance
models

Access to Document

https://www.nrel.gov/docs/fy21osti/75923.pdf

Cite this

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title = "Clear Sky Irradiance Year-to-Year Variations and Trends: Preprint",

abstract = "Solar radiation data for seven SURFRAD stations for the period 1996-2018 show an increase in irradiance under clear skies over time, with an interannual variability of the increase. A popular implementation of a clear sky model provided modeled irradiances for comparison with the SURFRAD data under conditions screened for clear skies. The use of the clear sky model, which did not consider year-to-year variances in atmospheric turbidity, was found problematic for resolving small changes in irradiance important for determining PV system degradation over three or five years, but less problematic for a period of ten years.",

keywords = "aerosols, clear-sky, data, irradiance, models",

author = "Bill Marion",

note = "See NREL/CP-5K00-79547 for paper as published in proceedings; 47th IEEE Photovoltaic Specialists Conference (PVSC 47) ; Conference date: 15-06-2020 Through 21-08-2020",

year = "2020",

language = "American English",

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TY - CONF

T1 - Clear Sky Irradiance Year-to-Year Variations and Trends: Preprint

AU - Marion, Bill

N1 - See NREL/CP-5K00-79547 for paper as published in proceedings

PY - 2020

Y1 - 2020

N2 - Solar radiation data for seven SURFRAD stations for the period 1996-2018 show an increase in irradiance under clear skies over time, with an interannual variability of the increase. A popular implementation of a clear sky model provided modeled irradiances for comparison with the SURFRAD data under conditions screened for clear skies. The use of the clear sky model, which did not consider year-to-year variances in atmospheric turbidity, was found problematic for resolving small changes in irradiance important for determining PV system degradation over three or five years, but less problematic for a period of ten years.

AB - Solar radiation data for seven SURFRAD stations for the period 1996-2018 show an increase in irradiance under clear skies over time, with an interannual variability of the increase. A popular implementation of a clear sky model provided modeled irradiances for comparison with the SURFRAD data under conditions screened for clear skies. The use of the clear sky model, which did not consider year-to-year variances in atmospheric turbidity, was found problematic for resolving small changes in irradiance important for determining PV system degradation over three or five years, but less problematic for a period of ten years.

KW - aerosols

KW - clear-sky

KW - data

KW - irradiance

KW - models

M3 - Paper

T2 - 47th IEEE Photovoltaic Specialists Conference (PVSC 47)

Y2 - 15 June 2020 through 21 August 2020

ER -

Clear Sky Irradiance Year-to-Year Variations and Trends: Preprint

Abstract

Conference

Bibliographical note

NREL Publication Number

Keywords

Access to Document

Fingerprint

Cite this