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'.

4. Six Questions about getting power from wind and sun (in German)  

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].

Fragen / Kommentare / Kritik =>  







Challenge for Teams of Engineers






                NAN  ;-)