Abstract
Exergy analysis is usually used to determine exergy efficiencies and identify and quantify exergy destructions so that directions for improved efficiency can be determined. This chapter presents exergy analyses of several renewable energy systems including solar photovoltaic (PV) systems, solar ponds, wind turbines, and geothermal district heating systems and power plants. It describes solar PV systems and their components and discusses the use of exergy analysis to assess and improve solar PV systems. Exergy methods provide a physical basis for understanding, refining, and predicting the variations in solar PV behavior. The study also provides and compares energy- and exergy-based solar PV efficiency definitions. It presents a thermodynamic analysis of wind energy using energy and exergy analysis and the exergy is formulated of wind energy and its components. Energy and exergy efficiencies are compared and shown to depend on the area considered. A spatio-temporal mapping approach to wind exergy analysis is also provided. Finally, the chapter presents two case studies: energy and exergy analyses of a geothermal district heating system and exergy analysis of a dual-level binary geothermal power plant. These and other renewable energy systems are likely to play increasingly important roles in societies in the future.
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