[ExI] SETI for Post Singularity Civ
ryacko at gmail.com
Thu Jan 22 08:44:00 UTC 2015
To quote Fremlin's article:
Stage 4a: up to 12,000 million million in 800 years' time. Dead end
> Above two people per square meter, severe refrigeration problems occur. If
> the oceans were used as a heat sink, their mean temperature would have to
> rise about 1 °C per year to absorb 500 watts per square meter. This would
> be all right for the doubling time of 37 years, at the end of which we
> should have four people per square meter. Half another doubling time could
> be gained if efficient heat pumps (which, for reasons of thermal
> efficiency, would require primary energy sources of very high temperature)
> could be used to bring the ocean to the boil.
> Two more doublings would be permitted if the oceans were converted into
> steam, though that would create an atmospheric pressure comparable with the
> mean ocean bottom pressure at present. Since the resulting steam blanket
> would also be effectively opaque to all radiation, no further heat sink
> could be organized and this procedure would therefore seem to lead to a
> dead end.
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