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At 05:35 PM 10/21/2000 -0700, Paul Braunbehrens wrote: Hello Paul, >However, if it takes 1/2 hour in water to cool your tank It doesn't take that long... >and 4 hours in air, and they fill your >tank in 5 minutes and then take it out of the water, then the water >isn't doing much. Even in those five minutes a significant amount of thermal energy can be transferred from the tank to the water. The rate at which the energy moves from one to the other is a function of the temperature differential. The temperature drop, like many things in nature, is a curve, not a line. When the tank is at its hottest, the energy is leaving at the fastest rate (steep end of the curve). So, five minutes right after a hot fill does a lot more for you than five minutes when the tanks are close to equilibrium. >The question is if it has any effect in the real world >situation of getting a fill. OK, I see where you're coming from. I don't work in a dive shop and never have, so I can't say whether at a rapid-fire fill station water makes any difference (though most fill-stations have water so that should tell you something). I do, however, fill two to four sets of doubles plus deco bottles and stages for myself every weekend. In that scenario the water makes a huge difference. -Mike Rodriguez <mikey@mi*.ne*> http://www.mikey.net/aue Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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