Paul, would using a CO2 bottle and spray bar be effective in cooling
 the time to climb heat exchangers?

Ray Hellstrom

I never tried that. I assume it works better than a cold water
spray. We have a ten gallon tank and a 100 psi pump for intake water
injection and we planned to also use that for spraying cooling water
on the cross counter flow heat exchanger.


How much CO2 would we need for one minute and how much would  it
weigh? The pressure tank sounds heavy.


Paul Lamar

Paul, I'm not sure how long it would run as I not up on the
calculations for the delta temperature would be but I see a five
pound capacity bottle weights eight pounds. There are 2.5 pound tanks
but again not knowing the amount needed I couldn't advise on it. CO2
is cheap and safe unless punctured.

Ray Hellstrom



I'll stop with this link from the company web site:
http://www.designengineering.com//content/cryo2-cool-way-get-more-power

Ray Hellstrom

Water converting into vapor (latent heat of vaporization) absorbs 970
BTU per pound. CO2, 247. I think on your minute and a half time scale water
will be the right answer, but it will only be useful for the period of time that
it's actually contacting the hot metal; any water that drips off will
not have absorbed as much heat as it could have if converted to vapor.
If you needed cooling for a few seconds CO2 might be worth the weight
penalty but you'd still have a problem getting the heat to transfer out
of the metal into the CO2 liquid.

David Josephson


Exactly what I needed David. Thanks. Our temperature red line is 185 F on the 650 HP
time to climb engine  so I don't think we will be making any steam (vapor).

Paul Lamar


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