Endo-irreversible thermo-mechanical engine with new concept of entropy production action coefficient

TL;DR

This paper introduces a novel thermo-mechanical engine model with an innovative entropy production action coefficient, providing new bounds and optimization strategies for energy conversion efficiency.

Contribution

It presents a new endo-irreversible engine model with a functional entropy production expression, extending thermodynamics analysis beyond traditional reversible assumptions.

Findings

Derived new upper bounds for thermomechanical conversion.

Identified three optimal conditions for energy and power output.

Proposed a novel entropy production action coefficient for engine analysis.

Abstract

Thermostatics of CARNOT engines has been extended by more recent research based on endo-reversible model. Our model assumes exo-reversibility but endo-irreversibility to determine new upper-bound to thermomechanical conversion. We propose a functional expression of entropy production related to transformation cycle durations. This approach analyses the energy, entropy and power consequences. We introduce a new concept of entropy production actions that results in three optimums : maximum energy related to transformation durations, maximum energy associated with equipartition of entropy actions, optimal power for given period cycle.