The Sun is a larger planent which emits light and heat to the Earth for many applications such as solar heating, cooking, drying and interior illumination of buildings. Solar radiation data are required by solar engineers, architects, agriculturists and hydrologists for many applications. In the past, several empirical correlations have been developed in order to estimate the solar radiation around the world. The main objective of this study is to review the global solar radiation models available in the literature. There are several formulae which relate global radiation to other climatic parameters such as sunshine hours, relative humidity and maximum temperature. In this paper, the models are classified into three viz: models based on ratio (H/H o ), non-linear models and models based on empirical coefficients 'a' and 'b'.
Renewable energy system usually refers to as an environmentally friendly energy system and most reliable and cost efficient one. Solar energy system is among the renewable energy system sourcing from sun that is freely available in nature. The utilization of renewable energy offers a wide range of exceptional benefits of human life, therefore its necessity for researchers to find ways of increasing the performance of the system in order to satisfy the human needs. In this work, a comprehensive review on performance assessment of different solar energy technologies using energy and exergy analysis approaches was carried out, and some important conclusions were drawn out. Some on the conclusions are energy efficiency for all the solar energy systems have been found to be greater than that of exergy efficiency and exergy analysis method is a very useful tool, especially on performance evaluation of solar energy systems.
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