www.piclist.com/techref/index.htm?key=air+car+zero+pollution

Matthew McMahon says -

Subject: The Air Car - zero pollution and very low running costs -

gizmag Article

> http://gizmag.com/go/7000/

French designed. Indian made.

300 km range claimed.

Approx 10% of petrol running costs claimed.

E1.5 per 300 km fill.

68 mph toppppp speed.

Lessee.

E1.5 ~~= $US2? ~= $NZ3.

Approx 2 litres petrol at NZ prices.

So 150 km/litre or about 375 mpg-US or 425 mpg imperial.

No mention of pressure used.

90 m^3 of gas said to be stored.

You'd be (very) lucky to get 1 m^3 of storage in a small car so that's

90+ atmosphere =~~ 1500 psi or 9 MPa.

Probably double that.

Would need a very many stage expansion motor to handle that

efficiently.

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

... .

>From an electricity point of view. $NZ3 buys about 20 kWH of

electricity or the same energy content as 2 litre of petrol.

150 km on a litre of petrol given equivalent energy content is "rather

good".

I very strongly suspect that their energy costing claims are

fallacious.

I'd be happy to be proven wrong.

E&OE as always

Russell

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