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.

References

References
1.
Ekren
,
O.
,
2003
, “
Optimization of a Hybrid Combination of a Photovoltaic System and a Wind Energy Conversion System
,” M.Sc. thesis,
Izmir Institute of Technology
,
Urla, Turkey
.
2.
Tasdemiroglu
,
E.
, and
Sever
,
R.
,
1991
, “
Estimation of Monthly Average, Daily, Horizontal Diffuse Radiation in Turkey
,”
Energy
,
16
(
4
), pp.
787
790
.10.1016/0360-5442(91)90030-P
3.
Togrul
,
I. T.
, and
Onat
,
E.
,
1999
, “
A Study for Estimating Solar Radiation in Elazig Using Geographical and Meteorological Data
,”
Energy Convers. Manage.
,
40
, pp.
1577
1584
.10.1016/S0196-8904(99)00035-7
4.
Kaygusuz
,
K.
,
1999
, “
The Comparison of Measured and Calculated Solar Radiations in Trabzon, Turkey
,”
Energy Sources
,
21
, pp.
347
353
.10.1080/00908319950014830
5.
Tiris
,
M.
,
Tiris
,
C.
, and
Ture
,
I. E.
,
1996
, “
Correlations of Monthly-Average Daily Global, Diffuse and Beam Radiations With Hours of Bright Sunshine in Gebze, Turkey
,”
Energy Convers. Manage.
,
37
, pp.
1417
1421
.10.1016/0196-8904(95)00227-8
6.
Tiris
,
M.
, and
Tiris
,
C.
,
1997
, “
Analysis of Solar Radiation Data for Gebze, Turkey
,”
Energy Convers. Manage.
,
38
, pp.
179
186
.10.1016/0196-8904(96)00030-1
7.
Ertekin
,
C.
, and
Yaldiz
,
O.
,
2000
, “
Comparison of Some Existing Models for Estimating Global Solar Radiation for Antalya (Turkey)
,”
Energy Convers. Manage.
,
41
, pp.
311
330
.10.1016/S0196-8904(99)00127-2
8.
Ulgen
,
K.
, and
Hepbasli
,
A.
,
2002
, “
Comparison of Solar Radiation Correlations for Izmir, Turkey
,”
Int. J. Energy Res.
,
26
, pp.
413
430
.10.1002/er.794
9.
Ulgen
,
K.
, and
Hepbasli
,
A.
,
2002
, “
Prediction of Solar Radiation Parameters Through Clearness Index for Izmir, Turkey
,”
Energy Sources
,
24
, pp.
773
785
.10.1080/00908310290086680
10.
Bulut
,
H.
, and
Buyukalaca
,
O.
,
2007
, “
Simple Model for the Generation of Daily Global Solar-Radiation Data in Turkey
,”
Appl. Energy
,
84
, pp.
477
491
.10.1016/j.apenergy.2006.10.003
11.
Bulut
,
H.
,
2003
, “
Generation of Typical Solar Radiation Data for Istanbul, Turkey
,”
Int. J. Energy Res.
,
27
, pp.
847
855
.10.1002/er.920
12.
Gunes
,
M.
,
2002
, “
Comparison of Total Horizontal Solar Radiation Measurements With Some Existing Models for Turkey
,”
Energy Sources
,
24
, pp.
735
742
.10.1080/00908310290086644
13.
Bakirci
,
K.
,
2009
, “
Correlations for Estimation of Daily Global Solar Radiation With Hours of Bright Sunshine in Turkey
,”
Energy
,
34
, pp.
485
501
.10.1016/j.energy.2009.02.005
14.
Aras
,
H.
,
Balli
,
O.
, and
Hepbasli
,
A.
,
2006
, “
Estimating the Horizontal Diffuse Solar Radiation Over the Central Anatolia Region of Turkey
,”
Energy Convers. Manage.
,
47
, pp.
2240
2249
.10.1016/j.enconman.2005.11.024
15.
Kaygusuz
,
K.
, and
Ayhan
,
T.
,
1999
, “
Analysis of Solar Radiation Data for Trabzon, Turkey
,”
Energy Convers. Manage.
,
40
, pp.
545
556
.10.1016/S0196-8904(98)00119-8
16.
Ulgen
,
K.
, and
Hepbasli
,
A.
,
2009
, “
Diffuse Solar Radiation Estimation Models for Turkey's Big Cities
,”
Energy Convers. Manage.
,
50
, pp.
149
156
.10.1016/j.enconman.2008.08.013
17.
Kudish
,
A. I.
, and
Lanetz
,
A.
,
1992
, “
Analysis of the Solar Radiation Data for Beer Sheva, Israel, and Its Environs
,”
Sol. Energy
,
48
, pp.
97
106
.10.1016/0038-092X(92)90038-C
18.
Soler
,
A.
,
1988
, “
The Dependence on Solar Elevation of the Correlation Between Monthly Average Hourly Diffuse and Global Radiation
,”
Sol. Energy
,
41
, pp.
335
340
.10.1016/0038-092X(88)90029-1
19.
Aroudam
,
A. E.
,
Hammouti
,
M. E.
, and
Ezbakhe
,
H.
,
1992
, “
Determination of Correlations of Solar Radiation Measured in Tetouan
,”
Renewable Energy
,
2
, pp.
473
476
.10.1016/0960-1481(92)90083-F
20.
Nfaoui
,
H.
, and
Buret
,
J.
,
1993
, “
Estimation of Daily and Monthly Direct, Diffuse and Global Solar Radiation in Rambat (Morocco)
,”
Renewable Energy
,
3
, pp.
923
930
.10.1016/0960-1481(93)90052-I
21.
Srivasta
,
S. K.
,
Singh
,
O. P.
, and
Pandey
,
G. N.
,
1993
, “
Estimation of Global Solar Radiation in Uttar Pradesh (India) and Comparison of Some Existing Correlations
,”
Sol. Energy
,
51
, pp.
27
29
.10.1016/0038-092X(93)90038-P
22.
Samuel
,
T.
,
1991
, “
Estimation of Global Radiation for Sri Lanka
,”
Sol. Energy
,
47
, pp.
333
337
.10.1016/0038-092X(91)90026-S
23.
Huashan
,
L. I.
,
Weibin
,
M. A.
,
Yongwang
,
L.
, and
Xianlong.
W.
,
2010
, “
Estimating Daily Global Solar Radiation by Day of Year in China
,”
Appl. Energy
,
87
, pp.
3011
3017
.10.1016/j.apenergy.2010.03.028
24.
Kumar
,
R.
, and
Umanand
,
L.
,
2005
, “
Estimation of Global Radiation Using Clearness Index Model for Sizing Photovoltaic System
,”
Renewable Energy
,
30
, pp.
2221
2233
.10.1016/j.renene.2005.02.009
25.
Hassan
,
A. H.
,
2001
, “
The Variability of the Daily Solar Radiation Components Over Helwan
,”
Renewable Energy
,
23
, pp.
641
649
.10.1016/S0960-1481(00)00144-0
26.
Iqbal
,
M.
,
1979
, “
Correlations of Average, Diffuse, and Beam Radiation With Hours of Bright Sunshine
,”
Sol. Energy
,
23
, pp.
169
173
.10.1016/0038-092X(79)90118-X
27.
Bakirci
,
K.
,
2009
, “
Models of Solar Radiation With Hours of Bright Sunshine: A Review
,”
Renewable Sustainable Energy Rev.
,
13
, pp.
2580
2588
.10.1016/j.rser.2009.07.011
28.
Demirbas
,
A.
,
2001
, “
Biomass and the Other Renewable and Sustainable Energy Options for Turkey in the Twenty-First Century
,”
Energy Sources
,
23
, pp.
177
187
.10.1080/00908310151092399
29.
Duffie
,
J. A.
, and
Beckman
,
W. A.
,
1991
,
Solar Engineering of Thermal Processes
,
Willey-Interscience Publication
,
New York
, Chap. 2.
30.
Perez
,
R.
,
Kmiecik
,
M.
,
Zelenka
,
A.
,
George
,
R.
, and
Renné
,
D.
,
2001
, “
Effective Accuracy of Satellite-Derived Global, Direct and Diffuse Irradiance in the Central USA
,”
2001 Solar Energy Forum
,
Washington, DC
, April 21–25.
31.
Senkal
,
O.
, and
Kuleli
,
T.
,
2009
, “
Estimation of Solar Radiation Over Turkey Using Artificial Neural Network and Satellite Data
,”
Appl. Energy
,
86
, pp.
1222
1228
.10.1016/j.apenergy.2008.06.003
32.
Tarhan
,
S.
, and
Sari
,
A.
,
2005
, “
Model Selection for Global and Diffuse Radiation Over the Central Black Sea (CBS) Region of Turkey
,”
Energy Convers. Manage.
,
46
, pp.
605
613
.10.1016/j.enconman.2004.04.004
33.
Liu
,
B. Y. H.
, and
Jordan
,
R. C.
,
1960
, “
The Interrelationship and Characteristics Distribution of Direct, Diffuse and Total Solar Radiation
,”
Sol. Energy
,
4
, pp.
1
19
.10.1016/0038-092X(60)90062-1
34.
Reindl
,
T. D.
,
1988
, “
Estimating Diffuse Radiation on Horizontal Surfaces and Total Radiation on Tilted Surfaces
,” M.Sc. thesis,
University of Wisconsin
,
Madison, WI
.
You do not currently have access to this content.