Compressed air trams

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The Passing
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Compressed air trams




by The Passing » 07/09/05, 19:10

Very informative:

http://www.amtuir.org/05_index_htu_tram.htm
http://www.amtuir.org/05_htu_tw_france_ ... nantes.htm

There were even trams running on homeless water vapor. :o
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Valorous
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by Valorous » 10/11/05, 15:54

What the links do not say is that these trams should charge 500L of hot water at each terminal, to heat this air before decompression.

We still hear about compressed air engines, but without a heating system, which makes their use "short-lived" (until freezing of a hose or a pipe).

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by Christophe » 10/11/05, 16:36

Exact ... and this, among other things, is one of the big problems with the MDI air car ...
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by Rabelaisian » 19/08/08, 16:18

The links of the first message no longer work, some photos http://images.google.com/images?hl=fr&q ... a=N&tab=wi
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by Christophe » 19/08/08, 16:25

Ah thank you :)
It's always the risk with very old subjects :( I therefore corrected but I do not know if it corresponds exactly to the original links ...

I found this link interesting: http://www.aircaraccess.com/history.htm
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by Rabelaisian » 19/08/08, 22:13

By following your link, I came across the aeromovel http://www.autobloggreen.com/2008/01/07 ... treet-car/ which is a reinvention of the Pecq atmospheric railway in Saint-Germain-en-Laye http://mapage.noos.fr/shv2/cdf-atmos.htm
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by hic » 03/05/13, 12:55

Hi koen
Adiabatic compression and relaxation
*** http://fr.wikipedia.org/wiki/Compressio ... diabatique ***

Difference
between adiabatic expansion and conventional expansion

*** http://fr.wikipedia.org/wiki/V%C3%A9hic ... prim%C3%A9 ***
If the engine is 20 kW or the equivalent of 27 hp, the duration of operation at full power would be 11 minutes (adiabatic expansion) and 21 minutes (isothermal expansion).

*** http://enr-ee.com/fileadmin/user_upload ... emagne.pdf ***
2.2.2 Adiabatic storage technique
"Adiabatic" means any process associating two physical, chemical or biological systems which
do not exchange heat with each other.
Adiabatic storage by compressed air offers better energy efficiency. The heat of the
air compression in the underground cavities is stored. This heat is then recovered to
heat the compressed air returned to the heat recovery unit before injecting it into the turbine
high temperature.
This technique has a yield of 70% and allows
Koen wrote:What the links do not say is that these trams should charge 500L of hot water at each terminal, to heat this air before decompression.

We still hear about compressed air engines, but without a heating system, which makes their use "short-lived" (until freezing of a hose or a pipe).
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by chatelot16 » 03/05/13, 21:55

A theoretical estimate is also possible: according to the calculations presented in the article Pneumatic energy, the compressed air at 300 bars stored in a 300-liter tank represents, full tank, 126 kg of air (taken as a perfect gas). It can ideally produce energy between 27 MJ = 7,5 kWh (adiabatic expansion) and 51 MJ = 14,2 kWh (isothermal expansion).
These values ​​are majorities of what is really happening: the engine efficiency being taken equal to 1, in reality it is more likely to be 0,5 (or even less). The energy actually available would therefore be closer to 3,7 kWh (adiabatic expansion) and 7 kWh (isothermal expansion).


14,2KWh / 126 kg = 0,112 kWh / kg = 112Wh / kg
it's less than a lithium battery

and in addition this calculation is wrong: it only counts the weight of the air contained in the tank ... with a steel tank of the quality of the torch oxygen bottles the tank is 6 times heavier than the air we put in! that divides the energy density by 7
112Wh / kg / 7 = 16 Wh / kg

and that's not all, it's only with a perfect isothermal relaxation of output 1

with a carbon fiber tank the air weight / tank weight ratio is a little less bad, but we always remain largely below the 40Wh / kg of lead-acid batteries

even if the compressed air is bad in energy density it could have an interest if the compressed air tanks were cheaper than the batteries ... alas it is the opposite: the compressed air tanks are very dangerous : therefore subject to severe regulations, mandatory periodic checks! the kg of tank is more expensive than the kg of battery
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