Estimation of solar radiation parameters for Izmir, Turkey

Ülgen, Koray; Hepbaşlı, Arif

doi:10.1002/er.821

Cited by 36 publications

(22 citation statements)

References 30 publications

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“…In this regard, the solar radiation parameters, namely, global and diffuse solar radiation, have been correlated with respect to ambient temperatures in the fifth-order polynomial form for Izmir in Turkey on the yearly basis with coefficients of determination of 0.966 and 0.982, respectively, as given below (Ulgen and Hepbasli, 2002b): …”

Section: Methodsmentioning

confidence: 99%

Estimating and Comparing the Exergetic Solar Radiation Values of Various Climate Regions for Solar Energy Utilization

Hepbaşlı

Al-Suhaibani

2014

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Energy resources and their utilization intimately relate to sustainable development. In attaining sustainable development, increasing the energy efficiencies of processes utilizing sustainable energy resources plays an important role. The utilization of renewable energy offers a wide range of exceptional benefits. There is also a link between exergy and sustainable development. Exergy analysis has been widely used in the design, simulation, and performance evaluation of various energy systems as well as renewable energy sources. In this regard, determination of exergy of solar radiation is very crucial for various solar energy-related applications and is based on the relative potential of the maximum energy available from radiation. The efficiency factor limiting the gain of the maximum useful energy from the solar radiation is significantly similar to that of the Carnot efficiency for the heat engines. The main objectives of this study are two-fold, namely, (i) to comprehensively review various solar exergy models used in solar energy-related applications, and (ii) to determine the solar exergetic values for some regions of Saudi Arabia and Turkey, which are taken as two illustrative examples to which various models have been applied and compared. In this regard, the ratios of solar radiation exergy to solar radiation energy (exergy-to-energy ratio) for northeastern Saudi Arabia are calculated to be on average 0.933 for both approaches of Petela and Spanner and 0.950 for Jefer's approach at outside air temperatures between 16.18 and 33.01 ı C. These ratios for Izmir, Turkey are obtained to be on average 0.935 and 0.951 for the same approaches at a temperature range of 15-22 ı C, respectively. The values found using Jefer's approach appear to be 2% larger than the approaches of Petela and Spanner, while those are very close to the value of 0.95 proposed by Nobusawa.

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Section: Methodsmentioning

confidence: 99%

Estimating and Comparing the Exergetic Solar Radiation Values of Various Climate Regions for Solar Energy Utilization

Hepbaşlı

Al-Suhaibani

2014

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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“…This means that the cost of generating energy when making use of renewable energy is relatively cheap [[28], [25], [31], [30]]. Solar energy is simply defined as the energy gained by the earth as a result of light radiations from the sun.…”

Section: Renewable Energymentioning

confidence: 99%

Development of a Generalized Two-Parameter Temperature Based Linear Model for Assessment of Solar Irradiance on Nigerian Geo-Political Zones.

Ajenikoko¹,

Salami²

2017

Theoretical & Applied Science

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“…These models are usually expressed in either linear or polynomial fittings relating the diffuse fraction (H d ) with the clearness index and combining both clearness index (KT) and relative sunshine duration (Orgill and Hollands, 1977;Erbs et al, 1982;Trabea, 1992;Jacovides, 2006;Hamdy, 2007, Falayi et al, 2011 established hourly correlations between K T and H d under diverse climatic conditions. Ulgen and Hepbasli (2002) correlated the ratio of monthly average hourly diffuse solar radiation to monthly average hourly global solar radiation with the monthly average hourly clearness index in form of polynomial relationships for the city of Izmir, Turkey. Oliveira et al, (2002) used measurements of global and diffuse solar radiations in the City of Sao Paulo (Brazil) to derive empirical models to estimate hourly, daily and monthly diffuse solar radiation from values of the global solar radiation, based on the correlation between the diffuse fraction and clearness index…”

Section: Variation Of Diffuse Solar Radiationmentioning

confidence: 99%