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Old 01-11-2012, 03:27 PM   #29 (permalink)
mort
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Quote:
Originally Posted by Ecky View Post
I don't fully understand how your engine works, but I'm definitely going to follow your build thread closely.

Off topic, but what holds more energy per weight and/or per volume, a battery or a compressed air tank?
Hi Ecky,
According to wikipedia NiMH batteries are about 75 wh/kg and 300 wh/l
Litium Ion batteries are 200 wh/kg and 400 wh/l
An air tank at 300 bar is about 140 wh/kg and 55 wh/l
I couldn't find comparable numbers for commercial accumulators. Experimental hydraulic automotive systems only claim about 3 wh/l. The experimental UPS hydraulic hybrid claimed 2.5 wh/l at 7000 psi. (480 bar = 48 Mpa))
Gasoline has about 13000 wh/kg and 9400 wh/l
-mort
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