Blue Drive Technologies

Silver Linings / Silberstreifen am Horizont

My Playground for Technical Insights: 

(Open Innovation and Provoking Gadgeteer Questions)

Flaggendesign: Sophia Pompéry, https://www.kunstverein-amrum.de

I like wind turbines!   ;-) 

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

Links to actual ones (Research Activities):

http://www.sciencedirect.com/science/article/pii/S0360544212000084

http://www.academia.edu/4037829/Microturbine_EFGT_Biomass_Cofiring_Natural_gas

http://www.bioliquids-chp.eu/index.php?id=35&rid=12&r= 

http://www.freevalve.com/technology/the-pneumatic-hybrid/ 

Links to commercial available ones:

  1. goth ;-) - but still in operation! -  http://www.solarplan.org/documents/BBC_Huntorf_engl.pdf : 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:  https://www.echogen.com/our-solution/product-series/eps100/ and  https://www.heise.de/tr/artikel/Mini-Turbine-soll-eine-ganze-Stadt-versorgen-3177558.html  (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.: http://www.cimac.com/cms/upload/Publication_Press/Recommendations/Recommendation_27_rev_081007.pdf=> 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)

https://www.yumpu.com/de/document/view/62058328/6-fragen-zur-stromerzeugung-aus-wind-und-sonne-2018-09-09 and possible answers:  

https://www.yumpu.com/en/document/view/62108811/power-statistics-and-h2-evolution (in English), 

https://m.phys.org/news/2017-07-scientists-robust-catalyst-hydrogen-oxygen.html (in English) and 

https://www.siemens.com/customer-magazine/en/home/energy/bringing-power-to-the-people/gas-turbines-receive-fuel-flexibility-boost.html (in English, catchword = '45 percent hydrogen') respectively in German:   https://www.spektrum.de/magazin/billigere-katalysatoren-fuer-die-wasserspaltung/1511569 und 

https://www.erdgas.info/artikel/detail/2019/gasturbinen-hersteller-werden-gruen/ , Stichwort auf der Seite (Ctrl+f) = "100 Prozent Wasserstoff" .  


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)
File download 2019-04-28
Using onshore wind speed statistics data to estimate the amount of electric energy being available while balancing power with H2-Evolution.
File download 2019-07-08
Using OFFSHORE wind speed statistics data to estimate the amount of electric energy being available while balancing power with H2-Evolution.


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 - 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 =>   hubert.bellm@gmail.com