A little pencil work:
The heat of vaporization of liquid air is 88 Btu/lb (86 Btu/lb for LN2)
at 2546 Btu/hp-hr.
At 25% overall thermal efficiency (~10,000 Btu/Hp-Hr) 120 lbs of LN2 would
have to be carried to deliver that 1.0 Hp-Hr.
LN2 at $.10/lb would cost you $12.00/Hp-Hr. :-)
OTOH, 120 lbs of lead-acid storage batteries at 12 watt-hr/lb (41Btu/lb or 5,000 Btu/120 lb)
at 80% efficiency can deliver 1.55 Hp-hr. About 2 Kw-Hr of wall-socket electricity will recharge the
batteries for about $.25.
OR:
Concurrent Electrolytic Production of Hydrogen- Aqueous Hydrogen Peroxide
at 50 Kw-Hr per 2 pounds Hydrogen-34 pounds Hydrogen Peroxide in 100 pounds of
water (35%solution) could develop 150,000 Btu in a special-compact "steam engine" that
might get up to 40% efficiency, thus deliver about 25 Hp-Hr of shaft work with about
250 pounds of on-board "fuel" storage weight
Frederick
