X-Mozilla-Keys:                                                                                 
Fred wrote:

Correction: takes about 1000 btu to evaporate one pound of water, but about
40 btu to melt a pound of ice, if I recall correctly.  (And one btu to heat
one  pound of water 0ne degree Farenheit.)  That is why evaporative cooling
works so well.   Same thing works in reverse: condensing a pound of water
takes 1000 btu/pound of water.  that is why steam heat works well.  Boil it
in the basement, then condense it in the heaters upstairs, and drain the
liquid water back to the boiler.

F

 
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