Conclusions

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Estimation of typical solar radiation is very important for the calculations concerning many solar applications. For this, collection and management of sunlight data obtained from actual measurements is important. But solar radiation measurements are not easily available because of the expensive measuring equipment and techniques required. Accordingly, for regions where no solar radiation is measured, solar radiation needs to be estimated using other meteorological data. However, currently in Korea, there is no study on how to do this. In this chapter, the global radiation of the four locations in South Korea where the global radiation is measured using comparatively simple CRM model was calculated, compared, and analyzed. Also, the difference of the result of global radiation calculation caused by change of coefficients was estimated by applying the coefficients calculated for the four locations to Ulsan where global radiation measurement is not made. The result was that the values of the global radiation measured and calculated were similar for major cities. Also, the result of applying the coefficients of the four locations for the calculation of the global radiation of Ulsan, which is located 380, 55, 330, 360 km away from Seoul, Busan, Gwangju and Daejeon, respectively, showed difference of 10-380 W/m2. Accordingly, when calculating global radiation of a location where global radiation is not measured, the difference of the coefficient depending on the location should be considered.

Acknowledgement

This work was supported by the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MOST) (No. R01-2007-000-10231-0)

Nomenclature

A, B, C, D Coefficients for model

G Global irradiation

ID Diffuse horizontal irradiance

IG Total global horizontal irradiation, WIm2

IGC Clear sky global horizontal irradiation, WIm2

N Cloud cover (Octa)

R2 Coefficient of determination

A Solar altitude (radian)

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Getting Started With Solar

Getting Started With Solar

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