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re: spring cooled refrigerator?
28 sep 2000
chuck simmons wrote:
>...the goal as i remember... was to use the cold water to cool a modest
>cold storage for food. the generator idea has a bit of a problem...
>since the water turbine is not 100% efficient, the waste energy ends up
>as heat in the output water. the water is warmer leaving the turbine
>than it is entering...
as with many alternative energy ideas (eg making electricity with rainwater
from the roof), some numbers can help get a sense of proportion here. if a
pound of water falls 150 feet, and the energy is completely converted to
heat, ie 150ft-lb/550ft-lb/s-hp or 0.27 hp seconds or 203 watt-seconds or
0.056 wh or 0.193 btu, that only raises the water temp 0.2 f.
and the turbine might be after the fridge.
nick
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