>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of Russell McMahon
>Sent: 20 March 2007 12:38
>To: PIC List
>Subject: [EE]:: [TECHO] The Air Car - zero pollution and very 
>low running costs- gizmag Article
>
>Very very (very ...) roughly using expanded energy equivalent, 90 m^3 
>at 1 atmosphere = 90 m^3 x 100 kPa  = 9 MPa energy.
>9 E6  /1000 kW/W  /3600 hr/sec = 2.5 kWH = about 10% of what I 
>calculate the cost would buy in energy equivalent electricity. And 2.5 
>kWh is utterly insufficient for the task as 20 kWH (see below) is 
>rather skimpy. Possibly a missed decimal somewhere in my figures but 
>... .

http://www.theaircar.com/faq.html#p7 suggests a pressure of 300bar in the tanks.  Then they emphasise safety by saying it's the same type of tank used for LPG storage in busses.  Hmm, IIRC LPG vapour pressure is about 12bar at nominal 25C temperature...

Some interesting stuff on the engine on that website however, especialy the atriculated con rod linkage.  It's only a two stage engine though.

Regards

Mike

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