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

[Tom Lane]

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Single pump thermalsyphon exterior heat exchangers only work well with side 
ported tanks and are 30 to 40% less efficient than double pump systems. 
Especially on full sun days with no draw from 9:00 a.m to 5:00 p.m. by the 
owner
Gatortom
----- Original Message ----- 
From: "Darryl Thayer" <daryl_solar at yahoo.com>
To: <RE-wrenches at topica.com>
Sent: Sunday, April 16, 2006 9:01 AM
Subject: Re: Thermal - PV and diff controller? [RE-wrenches]


> 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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