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@h4ckernews@mastodon.social  ·  activity timestamp 3 days ago

Stirling Cycle Machine Analysis

https://ohioopen.library.ohio.edu/opentextbooks/9/

#HackerNews #StirlingCycle #MachineAnalysis #EnergyEfficiency #Thermodynamics #Engineering #Innovation

OHIO Open Library

Stirling Cycle Machine Analysis

Dedicated to William T. Beale (1928 - 2016), inventor of the Free Piston Stirling Engine, Mentor and Frien. This web resource is intended to be totally self contained learning resource for the analysis and development of computer simulation of single phase, piston/cylinder Stirling cycle machines. It includes thermodynamic, heat transfer and fluid flow friction analysis, and until 2012 it was used as resource material for an advanced course for Mechanical Engineering majors. The course structure was based on the book by I.Urieli & D.M.Berchowitz 'Stirling Cycle Engine Analysis' (Adam Hilger, 1984). The computer simulation program modules (originally written in FORTRAN) have all been updated and rewritten in MATLAB, a convenient interactive language which allows direct graphical output - essential for Stirling cycle analysis. A complete set of all the m-files are developed and provided, and they can be augmented and adapted as needed for specific engine/refrigerator configurations. It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license and as such is freely available. Comments and constructive criticism are welcomed by the author. Chapter 1: Background and Introduction Chapter 2: Basic Engine Configurations Chapter 3: Ideal Isothermal Analysis We define and analyze the Ideal Isothermal model of a Stirling engine, including the Schmidt Analysis, and discuss its limitations. One obviously incorrect conclusion of this analysis is that all three heat exchangers are redundant, and only contribute dead space, since all required heat transfer processes occur in the isothermal compression and expansion spaces. Nevertheless we can obtain a better understanding of a specific design, particularly when we augment the solution with Allan Organ's particle mass flow analysis. Chapter 4: Ideal Adiabatic Analysis We find that the Ideal Isothermal analysis predicts that the heat exchangers of a Stirling engine are redundant, thus we cannot seriously use this model to predict the ideal performance of an actual machine. We thus turn to an alternative model in which the compression and expansion spaces are adiabatic. We find that there is no closed form solution to this model and we have to resort to computer simulation. We gain various insights from using this model in particular with regards to the importance of the regenerator, which was not understood for a significant period. Chapter 5: Simple Analysis This analysis approach uses the Ideal Adiabatic model as a basis to predict the real performance of the three heat exchanger sections, particularly with regards to heat transfer and
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devSJR :python: :rstats: boosted
Eugene
Eugene
@datastory@mstdn.ca  ·  activity timestamp 2 months ago

💧 In my geochemical research, I often go beyond pure PHREEQC and use the RedModRphree package in R.
It’s a powerful bridge between thermodynamic modeling and data analysis — allowing Pourbaix (Eh–pH) diagrams to be computed for complex, multicomponent systems with a focus on a specific element.

Here are examples of modeled speciation diagrams for vanadium, lead, and zinc, based on the same high mineralized water sample composition.
They clearly illustrate how each element behaves under changing redox and pH conditions — from soluble oxyanions to sparingly soluble solid phases.

#Geochemistry #Rstats #PHREEQC #DataScience #EnvironmentalChemistry #Hydrogeology #Redox #PourbaixDiagram #Thermodynamics #OpenScience #RedModRphree

3 media
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
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Eugene
Eugene
@datastory@mstdn.ca  ·  activity timestamp 2 months ago

💧 In my geochemical research, I often go beyond pure PHREEQC and use the RedModRphree package in R.
It’s a powerful bridge between thermodynamic modeling and data analysis — allowing Pourbaix (Eh–pH) diagrams to be computed for complex, multicomponent systems with a focus on a specific element.

Here are examples of modeled speciation diagrams for vanadium, lead, and zinc, based on the same high mineralized water sample composition.
They clearly illustrate how each element behaves under changing redox and pH conditions — from soluble oxyanions to sparingly soluble solid phases.

#Geochemistry #Rstats #PHREEQC #DataScience #EnvironmentalChemistry #Hydrogeology #Redox #PourbaixDiagram #Thermodynamics #OpenScience #RedModRphree

3 media
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Zn.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for Pb.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
Pourbaix (Eh–pH) diagrams generated with RedModRphree for V.
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informapirata ⁂ :privacypride: boosted
fbusc
fbusc
@quantumquia@poliversity.it  ·  activity timestamp 2 months ago

È divertentissimo leggere E.T. Jaynes, in particolare i suoi ultimi lavori. Questo passaggio è da "The Gibbs Paradox". Si può scaricare qui.

There is a school of thought which militantly rejects all attempts to point out the close relation between entropy and information, claiming that such considerations have nothing to do with energy; or even that they would make entropy subjective and it could therefore have nothing to do with experimental facts at all. We would observe, however, that the number of fish that you can catch is an objective experimental fact; yet it depends on how much subjective information you have about the behavior of fish.

Traduzione in italiano:

Esiste una corrente di pensiero che respinge con forza ogni tentativo di evidenziare la stretta relazione tra entropia e informazione, sostenendo che tali considerazioni non abbiano nulla a che fare con l’energia; o persino che renderebbero l’entropia soggettiva, e che quindi non potrebbe avere alcun legame con i fatti sperimentali. Osserviamo, tuttavia, che il numero di pesci che si possono catturare è un fatto sperimentale oggettivo; eppure dipende da quanta informazione soggettiva si possiede sul comportamento dei pesci.

#SecondLaw #SecondaLegge #Jaynes #Entropy #Fisica #Termodinamica #Thermodynamics

@fisica
@scienze

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fbusc
fbusc
@quantumquia@poliversity.it  ·  activity timestamp 2 months ago

È divertentissimo leggere E.T. Jaynes, in particolare i suoi ultimi lavori. Questo passaggio è da "The Gibbs Paradox". Si può scaricare qui.

There is a school of thought which militantly rejects all attempts to point out the close relation between entropy and information, claiming that such considerations have nothing to do with energy; or even that they would make entropy subjective and it could therefore have nothing to do with experimental facts at all. We would observe, however, that the number of fish that you can catch is an objective experimental fact; yet it depends on how much subjective information you have about the behavior of fish.

Traduzione in italiano:

Esiste una corrente di pensiero che respinge con forza ogni tentativo di evidenziare la stretta relazione tra entropia e informazione, sostenendo che tali considerazioni non abbiano nulla a che fare con l’energia; o persino che renderebbero l’entropia soggettiva, e che quindi non potrebbe avere alcun legame con i fatti sperimentali. Osserviamo, tuttavia, che il numero di pesci che si possono catturare è un fatto sperimentale oggettivo; eppure dipende da quanta informazione soggettiva si possiede sul comportamento dei pesci.

#SecondLaw #SecondaLegge #Jaynes #Entropy #Fisica #Termodinamica #Thermodynamics

@fisica
@scienze

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