Calculation of Global Solar Radiation Based on Cloud Data for Major Cities of South Korea

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Hochun Yoo, Kwanho Lee, Sohee Park and Kyoung Hwan Noh

30.1 Introduction

Energy consumption causes a range of environmental pollution. Furthermore, with the increase in energy demand, the issue of energy shortage becomes increasingly serious. Since there is more and more concern on energy conservation and environmental protection, interest has been increasingly focused on the use of renewable energy. This is considered as a key source for the future, not only for South Korea but also for the world (Ulgen and Hepbasli, 2002). Especially, solar energy as a clean energy source and one kind of renewable energy is abundant in South Korea. Therefore, the precise measurement of the local solar radiation is required.

Also, the solar radiation data are a fundamental input for solar energy applications such as photovoltaics, solar thermal systems, and passive solar design. The data should be contemporary, reliable, and readily available for design, optimization, and performance evaluation of solar technologies for any particular geographical location (Bulut and Buyukalaca, 2007).

Unfortunately, these sites, however, are mainly concentrated in the developed countries and are scarcer within the developing world. Even where measured data are available for a given region, the data become less accurate the further away the location of implementation for use of solar energy is from the measuring station (Younes and Muneer, 2006). So far, a number of formulas and methods have been developed to estimate daily or monthly global radiation at different places in the world. The availability of meteorological parameters, which are used as the input of radiation models, is the important key to choose the proper radiation models at any location. Among all such meteorological parameters, cloud cover and bright sunshine hours are the most widely and commonly used ones to predict daily global solar radiation and its components at any location of interest (Sabziparvar, 2007). The two synoptic parameters (cloud cover and sunshine duration) provide an approximate means for generating those solar

I. Dincer et al. (eds.), Global Warming, Green Energy and Technology,

DOI 10.1007/978-1-4419-1017-2_30, © Springer Science+Business Media, LLC 2010

radiation data that are missing from a time series or have clearly been identified as being suspect. There are advantages as well as disadvantages in the use of cloud cover as a means for estimating solar irradiation (Muneer and Fairrooz, 2002).

The aim of this research is the estimation of the solar radiation of four cities (Seoul, Busan, Daejeon, Gwangju) by using cloud cover data. One of the parameters employed, cloud cover, is widely available from multiple regional and national weather stations. In Korea, while the amount of clouds is measured at all of the 42 locations of weather station, solar radiation is measured at just 22 stations. Kasten and Czeplak (1979), and Muneer and Gul (2000) have proposed cloud-based models for the estimation of global horizontal irradiance. For this, solar radiation data are produced from four regions (the regions make meteorological observations about solar radiation and cloud cover) through an equation by the cloud cover. And a correlation between measurement and calculated data is compared. Solar radiation data of the Ulsan area (the regions make meteorological observations about cloud cover) are produced based on the calculated value. This is for evaluation of the effect of distance on solar radiation estimation in non-measured area by substituting four coefficients from different areas for Ulsan's.

Global Solar Towns
Fig. 30.1 The region of South Korea.

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Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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