My Playground for Amateurish Technical Thoughts     Research Activities (Open Innovation) and Provoking Gadgeteer Questions 

I like my wife, my family down to the 3rd generation, the Elderly, old gas-fired engines, old cars and ...

goth power stations!   ;-) 

Some links to old and new Caloric rsp. External Heated/Fired Engines (no responsibility for technical or economic function):


Some older ones:     


Links to actual ones (Research Activities):

Links to commercial available ones:

  1. goth ;-) - but still in operation! - : Gas Turbine 'Specific Heat Rate' 5800kJ=1,612 kWh ( p. 14, ch. 5 Tech. Data) => Gas-to-Power-Efficiency = 62% ('single trip' = expansion only rsp. precompressed air already existing).
  2. Using supercritical CO2 instead of water steam: and  (German language).

Some provoking technical questions, I'm worried about:

 1. Why gas turbines don't have intercoolers in between compression stage and combustion chamber like turbochargers  - or compressors in general -  for a better efficiency? => See e.g.: .

=> Answer: Because any cooling causes a loss of energy to the system - but some cooling is essential to realize a cycle!

2. For generating electricity: Why do we shift our focus from steam power plants to gas turbines?
Citation: 'The efficiency of air-standard Brayton Cycle is therefore a function of the isentropic pressure ratio ...', see:
Borgnakke, Claus | Sonntag, Richard E. | „Fundamentals of Thermodynamics“, John Wiley&Sons Inc., NY, 2009, chapter  12.2, page. 423  -  Pressure ratios of modern gas turbines extend from ~20 up to ~40  -  but those of modern multistage steam turbines count well above 250 from my point of view, water steam is also a gas ... 1)

3. For generating mechanical power: Why do we use near ideal processes for both - the compression and expansion - parts of engines or turbines?

See playground model 1 and 2 below for a new triangular 'Brayton'-cycle dedicated to closed cycle gas turbines with the working fluid 'water steam'.

1) But due to the shrinking rsp. expanding gas volume, a higher compression ratio via multi-stage compression and expansion rsp. superheating requires multi-flow stage construction, which extends the overall expenses for buildings and machinery.

Some technical papers (max. 12 pages):

File download - 2016-05-26
Short Essay about Thermodynamical and Technical Aspects of Compressors Using Measurements of the Dynamic Pressure Inside the Cylinder Head.
File download - 2017-12-31
Playground model 1 of a triangular 'Brayton'-cycle for closed cycle gas turbines with the working fluid 'water steam'. (1 page)
File download - 2018-02-22
Improved playground model 2 of a triangular 'Brayton'-cycle for closed cycle gas turbines with superheating between first and second stage. (1 page)

Technische Kurzdarstellungen und Zusammenfassungen

Dateidownload - 08.09.2014
Analyse und Konzeptvorschlag zur Amortisation von PV-Anlagen.
Dateidownload - 29.05.2016
Thermodynamische und technische Aspekte von Kolbenverdichtern mit einer Schlussfolgerung aus dynamischen Druckmessungen. [12 Seiten]
Dateidownload - 01.10.2016
Tabelle der Druck- und Temperaturverhältnisse im Verdichtungstakt einer Kolbenmaschine beim Einblasen eines Gases [1 Seite, hochauflösende Grafik].
Dateidownload - 20.06.2017
"Thermodynamische und technische Aspekte von Expansionsmaschinen" - gewidmet Herrn Prof. Dr.-Ing. Adolf Schwab zum 80-zigsten Geburtstag [12 Seiten].
Dateidownload - 19.11.2017
"Thermodynamische und technische Aspekte von Expansionsmaschinen" - Update [12 S.] - Ersetzen d. Anm. 5), S. 10, d. einen betriebswirtsch. Hinweis.

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                NAN  ;-)