On the Efficiency of Electrochemical Devices from the Perspective of Endoreversible Thermodynamics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F19%3A43956370" target="_blank" >RIV/49777513:23640/19:43956370 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11025/35985" target="_blank" >http://hdl.handle.net/11025/35985</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/jnet-2018-0076" target="_blank" >10.1515/jnet-2018-0076</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the Efficiency of Electrochemical Devices from the Perspective of Endoreversible Thermodynamics

Popis výsledku v původním jazyce

The current work presents a concept that deals with the production of entropy generated by nonequilibrium processes in consequence of mass and energy transfer. The often used concept of endoreversible thermodynamics is based on thenon-realistic conjecture that the entire entropy production is realized at the system boundary. In this contribution, anopen system in a thermodynamically non equilibrium state is assumed. Production of entropy is generated due to nonequilibrium processes accompanied by energy conversion. The steady state of the system is maintained by a negative entropy flux. The conclusions for expansion energy conversion, i. e., thermal machines, confirm the general outcomes of the endoreversible thermodynamics. However, the presented conclusions related to non-expansion energy conversion offer a new perspective on the principle of minimum entropy production and the corresponding stability conditions at steady state. The analysis of the energy conversion in closed cycles is presented for fuel cells, i. e., nonexpansion energy conversion. The efficiency of the energy conversion is maximal at zero power output. Moreover, the efficiency of the fuel cells, and consequently the efficiency of all non-expansion energy conversion processes, depends on the load and then the maximal possible efficiency can be determined.

Název v anglickém jazyce

On the Efficiency of Electrochemical Devices from the Perspective of Endoreversible Thermodynamics

Popis výsledku anglicky

The current work presents a concept that deals with the production of entropy generated by nonequilibrium processes in consequence of mass and energy transfer. The often used concept of endoreversible thermodynamics is based on thenon-realistic conjecture that the entire entropy production is realized at the system boundary. In this contribution, anopen system in a thermodynamically non equilibrium state is assumed. Production of entropy is generated due to nonequilibrium processes accompanied by energy conversion. The steady state of the system is maintained by a negative entropy flux. The conclusions for expansion energy conversion, i. e., thermal machines, confirm the general outcomes of the endoreversible thermodynamics. However, the presented conclusions related to non-expansion energy conversion offer a new perspective on the principle of minimum entropy production and the corresponding stability conditions at steady state. The analysis of the energy conversion in closed cycles is presented for fuel cells, i. e., nonexpansion energy conversion. The efficiency of the energy conversion is maximal at zero power output. Moreover, the efficiency of the fuel cells, and consequently the efficiency of all non-expansion energy conversion processes, depends on the load and then the maximal possible efficiency can be determined.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS

ISSN

0340-0204

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

13

Strana od-do

425-437

Kód UT WoS článku

000489289200008

EID výsledku v databázi Scopus

2-s2.0-85072307474