Open AccessOn the Available Work Limits at Constant Heat and Entropy Production
Author(s) -
Saeed Shahsavari,
M. Moradi,
Morteza Esmaeilpour
Publication year - 2020
Publication title -
asian journal of applied sciences
Language(s) - English
Resource type - Journals
ISSN - 2321-0893
DOI - 10.24203/ajas.v8i6.6374
Subject(s) - carnot cycle , second law of thermodynamics , work (physics) , thermodynamics , entropy (arrow of time) , upper and lower bounds , entropy production , mathematics , limiting , work output , thermodynamic cycle , statistical physics , laws of thermodynamics , exergy , non equilibrium thermodynamics , physics , mathematical analysis , mechanical engineering , engineering
In this paper, using the combination of the first and second laws of thermodynamics, the work bounds in thermodynamic cycles are investigated generally and, to show the application, the results are extracted for some physical systems. Also, a new concept on the available work limits is extracted. To provide information on the maximum or minimum amount of work to be done during a thermodynamic cycle, energy balance, as well as irreversibility, should be considered. Entropy production during a thermodynamic cycle as a limiting criterion for work to be done is expressed as Clausius inequality. Therefore an inequality extracted from the first and second laws of thermodynamic to obtain lower and upper bounds of available work. The obtained upper bound of the work to be done is in agreement with Carnot’s rule. The lower bound is obtained at the maximum possible irreversibility during the respective cycle.