| Resumen |
Finite Time Thermodynamics (TTF) (Andresen B., Salamon P. and Berry R. S., 1997) is a branch of Thermodynamics that is dedicated to obtaining theoretical models of the operation of power plants, operating limits on thermodynamic variables such as: efficiency, power and entropy production among other thermodynamic variables. One method to improve the design of such power plants through TTF is to propose objective functions applied to different thermal engines, such as the Curzon-Ahlborn (CA) heat engine (1975). Velasco et al (2000) presented a new objective function in terms of a cost-effective type process applied to a CA heat engine. The objective function defined as a savings function, which allows a reduction of unwanted secondary effects in the operation of the power plant. Agrawal (2009) proposed a simplified version of the CA heat engine, in which he assigns the same thermal resistance and the same temperature difference to the upper and lower isotherms of the Carnot cycle. In the engine model proposed by Agrawal, the efficiency at maximum power coincides with efficiencies values reported for real engines, but with a slightly lower power production. In 2021, Barranco-Jiménez et al (2021) made use of the so-called saving functions to analyze the Novikov (1958) heat engine model by varying the degree of participation of the processes proposed by Velasco et al (2000), in addition to considering two different heat transfer laws. In this work we propose the use of savings functions following the approach used by Velasco but applied to the Agrawal engine, through a Newton-type heat transfer law between the energy reservoirs. In addition, an analysis is presented on the variation of the weight coefficients such as that carried out by Barranco-Jiménez et al (2021) to finally present a numerical comparison with the reported efficiency of some real power plants. © 2024 37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2024. All rights reserved. |
