On 9/10/2011 7:58 AM, Karl Townsend wrote:

Richard, it will take one *hell* of a lot of ice. Dry ice would be
better than water ice but I know the water numbers off hand
9 btu to melt one pound of ice, another 31 btu goin up to 60, so use
40btu per pound.

That 5000 BTU ac running 5 hours is 25000 total btu
25000/40 is 600 lbs. I won't look it up but dry ice might be 6 times
better or 100 lbs. for five hours. Do the math to get better that an
approximation but you can see you'd literally need a ton of dry ice to
do the weekend.

maybe buy ten batteries.

Karl



Here is what I got this morning from Geof.



You only get 241 BTUs/Lb of dry ice.
5000 BTU/241 = 20.7 LBs of dry ice/hr or about 500 lbs/day.
Cost/lb $1, so at minimum you're spending $500/day
My 16000 BTU AC can't keep up with 100 degree temps. A 5K unit
certainly can't.