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re: my grid power usage is now down to 10 kwh per month
8 jun 2001
bob wrote:
>> ...it looks like a 16' cube made with 6" sip walls and a waterfall
>> wall could keep itself 64 f all day in june...
>don't forget that water is a limited resource also.
we might say insulation is too :-) how about soap bubbles? is it better
to make 75k btu/day of ac with 25k btu of electricity by burning 75k of
gas or coal or nuclear fuel and evaporating 50k btu of water at a central
utility, or make 75k btu/day of cooling by evaporating 50k btu/day of water
at a house? (the other 25k came from sky radiation, in this example.)
evaporating a pound of water takes about 1,000 btu, so 50k btu requires
50 pounds or about 7 gallons, vs the 75 gallons per day (?) consumed by
an average person, which could be reduced with a few lifestyle changes.
what does an average person pay for 7 gallons of water in phoenix, vs.
25k/3412 = 7.3 kwh of electricity? do utilities pay less for water?
does the price difference matter to the environment?
licl solar stills and heat exchangers are more complex, but they might
have zero water consumption with colder temps and dehumidification and
seasonal coolth and heat(h?) storage...
nick
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