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

[Darryl Thayer]

However several university and NREL studies have shown
that the thermal-siphon electrical energy savings by
not using the pump, can easily exceed the thermal
losses.  I assume this requires the proper heat
exchange sizing.
Darryl

--- "Todd Cory, Mt. Shasta Energy Services"
<toddcory at finestplanet.com> wrote:
> 
> Yep... relying on convection to drive the potable
> side of a heat 
> exchanger results in poor heat transfer and
> miserable efficiency.
> 
> Todd
> 
> Conrad Geyser wrote:
> 
> >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
> >  


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