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re: thermosyphoning freeze protection
11 jul 2003
daestrom  wrote:

>if freeze protection is the goal, keep in mind the density of water stops
>increasing with dropping temperatures when you get to about 39 degf.  from
>there on down to 32, the density actually decreases (i.e. 34 degree water
>'floats' above 39 degree water).  if your water nears 39 degf, your
>thermosyphon will stop, allowing the water in upper section to freeze.

that might happen when 60-sqrt(q/43) = 39, ie q = 43x21^2 = 18,963 btu/h
= (60-t)4, ie t = minus 4,686 f :-)


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