In an investigation of the power output of heat engines, a maximum for available work from irreversible en¬gines working at steady-state conditions was found in relation to internal entropy generation and heat exchange with the heating and cooling fluids. Internal irreversibility causes a maximum for efficiency, which is a function of the same parameters. The maxima were estimated from first- and second-law balances for an open system comprising input and output fluids serving as the heat sources for the work-producing closed cycle. Because of the large number of control variables, a numerical optimization method was then used to obtain the maxima in terms of heat exchange and entropy parameters.
Work and efficiency maxima for irreversible heat powerplants / G.Grazzini; R.Rinaldi; M.Tucci. - STAMPA. - (1994), pp. 417-428. (Intervento presentato al convegno Energy for the 21st Century, Proceedings of Florence World Energy Research Symposium tenutosi a Firenze nel 6-8 giugno).
Work and efficiency maxima for irreversible heat powerplants
GRAZZINI, GIUSEPPE;RINALDI, RINALDO;TUCCI, MARIO
1994
Abstract
In an investigation of the power output of heat engines, a maximum for available work from irreversible en¬gines working at steady-state conditions was found in relation to internal entropy generation and heat exchange with the heating and cooling fluids. Internal irreversibility causes a maximum for efficiency, which is a function of the same parameters. The maxima were estimated from first- and second-law balances for an open system comprising input and output fluids serving as the heat sources for the work-producing closed cycle. Because of the large number of control variables, a numerical optimization method was then used to obtain the maxima in terms of heat exchange and entropy parameters.
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