[Greenbuilding] Barra system

[Laren Corie]

I wrote;

> Actually, it is about 3500 ft³ of air.

 "raymond pokorny" <solarinterior at imagina.com>

> That just makes the transfer of heat all the more critical
> since the collection time is limited to suntime.

Hi Ray;

   Definitely.  And, it is even more pronounced in cold cloudy climates,
where you may need to collect enough heat for several days, in only a
few hours.  That is why I went to using attic heat storages, twenty four
years ago.  Not only is the collector to storage loop passive, it also
needs no dampers or controls, and it is wonderfully silent.  The other
excellent characteristic, is that the output is totally controlable, so
passive Solar becomes as stable and convenient as a furnace, with
a programmable thermostat

  Air makes an excellent trasfer medium, because it can
use the structure of the bulding as it ducting. It is relatively
easy to move passively, and it requires no expense or loss
of efficiency through heat exchangers. Leakage is also qyite
harmness. Relatively small water containers can be used as
heat storage to get both the heat exchange and stratification
advantages of rock bins, while having most of the thermal
capacity and internal heat transfer advantages of water,
and not even needing any plumbing.

-Laren Corie-
Natural Solar Building Design Since 1975
www.LarenCorie.com

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