“…In recent years, about 14% of the global energy demand is met by renewable energy resources, which is expected with remarkable potential in the future (Chen et al, 2011b;Cuce and Cuce, 2013;Hasan and Sumathy, 2010;Niu et al, 2014;Panwar et al, 2011). Both the developed countries and developing countries pay great attention to development of renewable energy.…”