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Posted By: Sprocketif there is anything to it
Posted By: SteamyTeaSecond Law of Thermodynamics states not (the forever bit).
Posted By: SprocketThere are suggestions that the workable scale is slightly larger than domestic.
Posted By: Sprocket>
I wonder if this "research" is just that or whether they really do have evidence it could lead to a practical affordable product. There are suggestions that the workable scale is slightly larger than domestic.
Posted By: Paul in Montreallast week, we had a thunderstorm in Montreal that dropped 80mm rain in 40 minutes (that's a whole month's worth  it was so heavy that manhole covers were blown off as geysers erupted ... and a hilly street near me had its asphalt stripped by the torrent of a river that formed). I did a few back of the envelope calculations and discovered the energy required to condense 80mm of rain over and area of 1 square kilometer is equivalent to 42,000 tons of TNT  so that's equivalent to 3 Hiroshimasized bomb's worth of energy over each square kilometer. Quite sobering really! Put another way, each square meter received the equivalent of 73kW power output over that 40 minute period.
Posted By: djhI'm confused about that. I agree that condensing the water releases thermal energy. I don't see how that has any effect on the ground.
Posted By: Paul in Montrealhow much energy was involved above each of those square metres to make that rainfall in the first place!
Posted By: djhWell, the energy isn't needed to make the rainfall. The energy is RELEASED when the rainfall is made. Making rain is exothermic.
Posted By: Paul in MontrealTrue. but that much energy was required to evaporate the water in the first place :)
Posted By: SteamyTea
Tends to be a more gradual process over several weeks though.
Not sure where Montreal's rain comes from, ours is from the Gulf of Mexico/Caribbean,
Posted By: djh I don't see how that has any effect on the ground. The energy released by the rain hitting the ground is its kinetic energy, converted from the gravitational potential energy by falling from a height.
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