Exergetic port-Hamiltonian systems: modelling basics

Lohmayer, Markus; Kotyczka, Paul; Leyendecker, Sigrid

doi:10.1080/13873954.2021.1979592

Cited by 4 publications

(1 citation statement)

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“…IPHS has recently been used to minimize the entropy, energy and exergy production of state transitions [ 78 ] by extending optimal control results for linear PHS [ 79 ]. These results suggest investigations with respect to the relation between IPHS and finite-time thermodynamics [ 80 , 81 , 82 ] and alternative PHS formulations, such as the one based on exergy [ 83 ] or time-varying PHS [ 84 ].…”

Section: Discussionmentioning

confidence: 99%

An Overview on Irreversible Port-Hamiltonian Systems

Ramírez

Gorrec

2022

Entropy

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A comprehensive overview of the irreversible port-Hamiltonian system’s formulation for finite and infinite dimensional systems defined on 1D spatial domains is provided in a unified manner. The irreversible port-Hamiltonian system formulation shows the extension of classical port-Hamiltonian system formulations to cope with irreversible thermodynamic systems for finite and infinite dimensional systems. This is achieved by including, in an explicit manner, the coupling between irreversible mechanical and thermal phenomena with the thermal domain as an energy-preserving and entropy-increasing operator. Similarly to Hamiltonian systems, this operator is skew-symmetric, guaranteeing energy conservation. To distinguish from Hamiltonian systems, the operator depends on co-state variables and is, hence, a nonlinear-function in the gradient of the total energy. This is what allows encoding the second law as a structural property of irreversible port-Hamiltonian systems. The formalism encompasses coupled thermo-mechanical systems and purely reversible or conservative systems as a particular case. This appears clearly when splitting the state space such that the entropy coordinate is separated from other state variables. Several examples have been used to illustrate the formalism, both for finite and infinite dimensional systems, and a discussion on ongoing and future studies is provided.

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