Abstract
By tight supply of power after the Great East Japan Earthquake, the use of renewable energy and unused energy has attracted attention. In this situation, opinion such as "a large amount of heat is thrown away to sea water in thermal power plants. You should use more of this low-temperature waste heat" is seen here and there. Cause of such misunderstandings would be a lack of knowledge about exergy. In this paper, the results of exergy analysis and that of enthalpy analysis are compared to show the effectiveness of exergy analysis.
