Grandpa wrote:
dpb wrote:
wrote:
...
my object is to find a method to chill a can of beer, or soda, or
anything else in a can from room temperature to near freezing
temperature within a minute or less. ...
Ain't gonna happen.
Starting at 70 F in an ice bath, a 12 oz 2.5"x5" beer can with 0.34 ft^2
of surface and 2 30 Btu/h-F-ft^2 natural convection water conductances
in series and RC = 2/(0.34x30)x12/16 = 0.147 hours (8.8 minutes) would
cool to 35 in -8.8ln((35-32)/(70-32)) = 22 minutes.
Spinning the can to raise the conductances by a factor of 20 would make
this 1.1 minutes.
Adding 30% calcium chloride to lower the ice temp to -50 F would make
this 0.44ln((35-(-50))/(70-(-50)) = 0.15 minutes, ie 9 seconds.
More like a feeble attempt at viral marketing for the one minute
beer can chiller ($68) after a 5 second Google search for "beer can
chiller."
The $10 Tinchilla looks interesting...
Nick