Since that the future of our planet is intricately entwined with the future choices of the energy, effective exploitation of non-conventional energy sources is becoming increasingly essential for modern world as fossil fuels are hazardous to environment and cannot sustain supply for long time as they are not renewable. Moreover, demand of energy is increasing rapidly. In this scenario, solar energy is being seen as potential viable resource for ever increasing hunger of the energy for the development of nation and by and large globe. In this seminar work, effort has been made to demonstrate this reality with proof of statistics from reliable sources. Furthermore, numerous new designs of Solar Air Heater are emerging in various aspects, in different number of roughness, in different cost. Extensive review of research done in this field in recent past is covered with their design characteristics and their suitability for specific conditions and applications with respect to their merits and demerits. We concluded from our study that the increase in parameters like flow rate and roughness height up to some desirable values lead to increase in the efficiency of SAH. In present case plate 3 with roughness height of 8mm and flow rate of 0.05kg/s showed the maximum efficiency of 51.6%. I. INTRODUCTION A. EnergyEnergy is the prime requirement of any system. It serves as backbone to the modern world economic as well as domestic sector. Whether simple or complicated every system requires some form of energy input. With increased urbanization, modernization and particularly industrialization has led to the tremendous consumption of energy particularly exhaustible sources of energy. There are mainly two types of energy sources available that include; 1) Nonrenewable sources 2) Renewable sources The non-renewable energy sources also called as conventional energy sources are exhaustible which include coal, petroleum, natural gas, etc. These sources once used can't be then reused or recycled, making these energy sources vulnerable to extinction. Hence one can't use such sources limitlessly without giving any due consideration to their availability. Further it has been predicted that these sources may last up to 75-100 years from now on, so alternative to such conventional sources of energy must be tracked. And one such alternative is the renewable sources of energy. The renewable energy sources also known as non-conventional sources are inexhaustible and are replenished naturally, these include solar energy, and hydroelectricity, wind energy, and biomass energy geo thermal energy etc. Around 30 nations have utilized these sources of energy to meet 20% of their energy requirements. To meet the growing energy demand high end researches are being carried out to utilize renewable energy sources more efficiently and to their fullest. Besides being readily available these resources are environment friendly i.e., these are least hazardous to both living and non-living creation. As an example, burning of coal produces lot of environment...

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