[Greenbuilding] hotter water

[larencorie at axilar.net]

From: "Nick Pyner" <npyner at tig.com.au>

> I recall seeing a picture of a solar heating system using
> two tanks. One was seriously big and the other only about
> 100 litres, if that. I have no idea where it is, I never
> understood it, and I can't recall any pipes visible, but
> I now believe the little one served as an intermediate,
> i.e.  just another heat exchanger, while the real storage
> was obviously in the large one. This would enable the
> medium to be pumped rapidly through the collector while
> circulation through the storage is kept slow - and gentle!

Hi Nick;

 The large tank may be a Solar preheat tank, and the
smaller one a conventional gas or electric backup tank
heater, to bring the water temperature up to 120-140F.
That is an arrangement that has been used a lot.

 -Laren Corie-
 Natural Solar Building Design
 and Consxultation, Since 1975
 www.ThermalAttic.com

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