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re: floating foam roof closed ecosystem aqua culture
31 mar 1998
dale trynor wrote:
>...it should be both easy to build a floating foam roof that insulates
>the large quantities of water that are natural to this...
i can imagine a greenhouse over a shallow roofpond, with a layer of
foamboard over it that sinks during the day, and some plastic film
over that to reduce evaporation and condensation... or, with no
foamboard, the roofpond might empty at night into a larger insulated
container on the ground, in order to reduce thermal loss.
>...what got me wondering about this sort of idea is the old biology
>experiment where you put a fish some algae and a snail all inside a
>sealed container and place it all in the sun, it apparently works
>till one of them dies and upsets the system.
i suppose this would work better with more animals or more diversity.
how can we predict whether a closed biological system will be unstable,
with a short lifetime, or robust and self-correcting, with a long lifetime?
>it also had me wondering about the idea of using solar collectors that
>while collecting heat also produced algae that also provides a fish
>food with the whole thing built over the foam roof .
or maybe under it? highish temperatures (~130 f) make solar heat stores
smaller...
>this could also be interesting to note the extreme efficiency that a
>thin layer of fertilized water is clamed to be able to produce from 30
>to 50 times more edible material from one acre but the book clamed the
>obvious difficulty of getting people to eat it.
the latest annual worldwatch book shows outdoor fish disappearing fast.
nick
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