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Research Papers

Developing and Evaluation of Various Correlations for Diffuse Solar Radiation for Urla (Izmir, Turkey)

[+] Author and Article Information
Orhan Ekren

Department of HVAC&R,
Ege University,
35100 Bornova-Izmir, Turkey
e-mail: orhanekren@gmail.com

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received January 10, 2011; final manuscript received October 9, 2012; published online November 21, 2012. Assoc. Editor: Carsten Hoyer-Klick.

J. Sol. Energy Eng 135(2), 021001 (Nov 21, 2012) (7 pages) Paper No: SOL-11-1007; doi: 10.1115/1.4007855 History: Received January 10, 2011; Revised October 09, 2012

Characteristics of site-specific solar irradiation is required to optimize a solar energy system. If no tracking system is used, the amount of electricity or heat produced by solar energy depends on the total solar radiation on a tilted surface. Although pyranometer measures direct plus diffuse solar radiation on a horizontal surface, there are many locations where diffuse radiation is not measured. Also, diffuse radiation is necessary to determine the total radiation on a tilted surface. Therefore, in this study, new correlations for diffuse solar radiation is proposed as a function of atmospheric parameters for Urla (Izmir, Turkey). After applying the statistical procedure on the measured data, seven new correlations are proposed for the ratio of hourly average diffuse and total radiation. Also, the ratio of monthly average daily diffuse and total radiation for this region is proposed.

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References

Figures

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Fig. 1

Global irradiation map for Turkey and Izmir

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Fig. 2

Locations of the measuring stations

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Fig. 3

The monthly average daily extraterrestrial, diffuse, direct, and total radiation for Urla

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Fig. 4

Hourly average total radiation between 5:00 and 12:00 h

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Fig. 5

Hourly average total radiation between 12:00 and 19:00 h

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Fig. 6

Hourly average diffuse radiation between 5:00 and 12:00 h

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Fig. 7

Hourly average diffuse radiation between 12:00 and 19:00 h

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Fig. 8

Hourly average diffuse radiation with kT

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Fig. 9

Monthly average diffuse radiation with KT

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Fig. 10

Monthly average diffuse radiation with S/So

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Fig. 11

Validation for hourly average diffuse radiation with kT

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Fig. 12

Validation for monthly average diffuse radiation with S/So

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