energy "payback" of PV's [RE-wrenches]

[Greg Egan]

Joel,

I'm sure you and most others on list already know, but for the benefit of
others, only 1 BTU is needed to raise the temperature of a pound of water 1
degree F. It takes more if you're trying to change a pound of ice to a pound of
water, or boiling a pound of water to make steam, because you're changing state
and there's more work involved.

Best,

Greg

--
Greg Egan
Alaska Renewable Energy
981 Gold Mine Trail Fairbanks, Alaska 99712
Phone: 907-457-4299; Fax: 907-457-4290; Email: gegan at renewalaska.com
URL:  http://www.renewalaska.com

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