Graphical analysis of real skies with the clear day index: Using PENN state SURFRAD data

Kelsey Yates, Lucas Witmer, Jeffrey R.S. Brownson

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

Abstract

Graphical methods are explored as an educational tool to convey the complimentary nature of clear sky models, clearness indices, and meteorological data. The hourly clearness index (kT ) and the hourly clear sky index (kc) can be used in energy simulations to convey anisotropic conditions of shortwave irradiation on oriented surfaces, used for long-term performance of solar energy conversion systems. The hourly clear sky index is the ratio of a measured global horizontal irradiation (I) relative to an estimated clear sky condition, Ic (MJ/m2), in contrast with the traditional clearness index calculated under AM0 irradiation conditions, I0. Measured data were collected from the SURFRAD monitoring station near Penn State. Clear sky estimation used the Bird Clear Sky Model (National Renewable Energy Laboratory) for global horizontal irradiation (GHI) and direct normal (DNI), as well as components of beam, and hemispherical diffuse irradiation. Days in January and July were assessed for State College, PA. Our graphical approach explores the combined plot of the measured and clear sky components. A stronger understanding is conveyed in the graphical approach for the relationships between components of solar irradiation and the role of air chemistry, clouds, and ground conditions.

Original languageEnglish (US)
Title of host publication42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference
PublisherAmerican Solar Energy Society
Pages651-657
Number of pages7
ISBN (Electronic)9781632660046
StatePublished - Jan 1 2013
Event42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference - Baltimore, United States
Duration: Apr 16 2013Apr 20 2013

Publication series

Name42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference

Other

Other42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference
CountryUnited States
CityBaltimore
Period4/16/134/20/13

Fingerprint

Irradiation
Birds
Energy conversion
Solar energy
Monitoring
Air

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment

Cite this

Yates, K., Witmer, L., & Brownson, J. R. S. (2013). Graphical analysis of real skies with the clear day index: Using PENN state SURFRAD data. In 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference (pp. 651-657). (42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference). American Solar Energy Society.
Yates, Kelsey ; Witmer, Lucas ; Brownson, Jeffrey R.S. / Graphical analysis of real skies with the clear day index : Using PENN state SURFRAD data. 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference. American Solar Energy Society, 2013. pp. 651-657 (42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference).
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Yates, K, Witmer, L & Brownson, JRS 2013, Graphical analysis of real skies with the clear day index: Using PENN state SURFRAD data. in 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference. 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference, American Solar Energy Society, pp. 651-657, 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference, Baltimore, United States, 4/16/13.

Graphical analysis of real skies with the clear day index : Using PENN state SURFRAD data. / Yates, Kelsey; Witmer, Lucas; Brownson, Jeffrey R.S.

42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference. American Solar Energy Society, 2013. p. 651-657 (42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference).

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

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M3 - Conference contribution

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Yates K, Witmer L, Brownson JRS. Graphical analysis of real skies with the clear day index: Using PENN state SURFRAD data. In 42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference. American Solar Energy Society. 2013. p. 651-657. (42nd ASES National Solar Conference 2013, SOLAR 2013, Including 42nd ASES Annual Conference and 38th National Passive Solar Conference).