Tham khảo tài liệu 'fundamental and advanced topics in wind power part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 17 Size Optimization of a Solar-wind Hybrid Energy System Using Two Simulation Based Optimization Techniques Orhan Ekren1 and Banu Yetkin Ekren2 department of HVAC Ege Vocational Training School Ege University Bornova 2 Industrial Engineering Department Pamukkale University Kinikli Turkey 1. Introduction1 Energy is an important fact for a country for both its socio-economic development and economic growth. Main energy source on earth is the fossil fuels. However the usage of fossil fuels causes global warming whose negative effects have recently been felt by all over the world. Also because it is limited on earth increased energy demand and high energy prices increase concerns on fossil fuels. For instance petroleum reservoirs are present only in few countries therefore the other countries mostly purchase petroleum from these countries more than their production amount. Hence decrease of fossil fuel reservoirs may create a new energy crisis and or energy wars as in 1970s in near future. For a sustainable world the usage of fossil fuels must be decreased in fact ended. Instead the usage of renewable energy sources must be increased. As it is known the interest in renewable energy sources has increased because it does not cause greenhouse effect in contrary to the fossil fuels. These energy sources are indigenous environmental friendly and they help to reduce the usage of fossil fuels. Solar wind wave biomass and geothermal energies are renewable energy sources. Sun is the source of all energies. Solar energy is usually used in two aims for thermal applications and for electricity production. Wind is the indirect form of solar energy and is always replenished. The past and the predicted amount of global renewable energy source status by 2040 are presented in Table 1. As seen in this table the renewable energy consumption is predicted to increase in the future. There are several studies on renewable energy sources and hybrid combination of these sources for .
