Thermal - PV and diff controller? [RE-wrenches]

[Conrad Geyser]

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Hey Ian, Kurt, Todd, Geoff et all,

Nice to hear those solar thermal topics.
That Art-tec controller is a lot less $ than a Tek-Mar!  The Tek-Mar is
really nice for versatility though.

In my testing of solar thermosiphon HX, I found that the temperature
differential needed to drive the domestic side of the HX was adding another
30 degrees to the soar loop temperature and lowering the efficiency.
Anybody else?

cheers,
Conrad Geyser
Cotuit Solar

>
>
> Related topics:
>
> We just installed a March pump in a PV-direct SDHW system here, and
> it's quite noisy (inside house in an open loft with the tank). I'm
> going to try an El-Sid pump instead. Any feedback on noise? Choice of
> pumps? Noise suppression?
>
> I'm just about to test a new DC control for PV-direct systems. See
> http://www.arttec.net/dtc/. This should improve system efficiency by
> avoiding pumping when the collector is colder than the tank.
>
> Best,
>
> Ian
>
> -- 
>
> Ian Woofenden <ian.woofenden at homepower.com>, Senior Editor
> Home Power magazine; Subscriptions: $22.50 per year, PO Box 520,
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