الفهرس 
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Abstract
Energy has become important force in the design of buildings, factories, individual machines, and power producing systems. In the search to satisfythe need for energy and the many other needs connected to the utilization of renewable energy sources, several questions arise. What kinds of renewable energy sources are appropriate to the variety of energy-related applications?. What are the energy implications of the use of these systems in small and large scale energy applications?. What limitations does economic considerations and power conversion efficiencies impose upon the renewable energy alternatives?. In what ways can the utilization of renewable energy sources affect the social and environmental aspecrs?.