Introduction
Due to the increasing prices of fossil fuels and taxes on energy sources, finding alternative, clean and economical sources of energy has nowadays become a major concern for households’ and nations’ economies. In addition, economic prosperity and quality of life, which are linked in most countries to per-capita energy consumption, is a great determinant and indicator of economical development [1–4].
Energy demand is a critical reason for extensive climate change, resource exploitation, and also restricts the living standards of humans [5,6].