DC heat [RE-wrenches]

[Conrad Geyser]

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Does anybody have any experience/recommendations for residential size 
groundwater heat tranfer heat pumps?
Conrad
Cotuit Solar

On Tue, 22 Nov 2005 08:02:34 -0800, Todd Cory, Mt. Shasta Energy Services 
wrote
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> 
> It is a common misconception that heat pumps do not work well at low 
> temperatures. Our air source, split (no ducts), mulit zone system 
> still performs at over 200% efficiency at 10 to 15 degrees F. Our 
> 30K btu unit has a 2 pole 30 breaker and "only" draws around 2500 
> watts running full out. The defrost cycle happens depending on the 
> outside temperature and humidity.
> 
> I love it and it has made our home zero energy with 3.2 kWh of PV.
> 
> Todd
> 
> Geoff Greenfield wrote:
> 
> >Thanks for all the input-
> >
> >I could suggest heat pump to the customer, however - one of the design 
goals
> >is simplicity (this is a remote installation in the high plateaus of 
Bolivia
> >after all).  There is no allowance for duct work in this building, and the
> >goal was to minimize battery plant, inverters and BOS... Also - my 
(minimal)
> >understanding of Heat pumps (air source) is that at about 20 degrees they
> >turn on the resistance strips anyway.... and sometimes there is a defrost
> >cycle etc...  I always tell battery based folks to not try and power them
> >(the last one had a 100 amp 240 breaker).  In response to Ian's thoughtful
> >post I need to learn more and open my mind to such possibilities.  I am
> >going to add a couple window AC units to MY house next summer....
> >
> >In a sense, DC resistance heating from the wind is kind of like direct 
water
> >pumping.  In my scheme we heat the slab directly (after charging our 
minimal
> >battery bank saved for AC loads).  Perhaps even go with two layers of heat
> >and heat the deeper layer after a T-stat is satisfied.   According to David
> >Katz - we can use off the shelf AC stuff with DC - this seems simple.
> >(Hmmm... how about 3-phase wild AC?)  Resistance heat is inefficient, but
> >also simple, reliable, easily installed and transported, avoids battery 
wear
> >and tear and battery/inverter losses.  This is where my gut is leading me -
> >any objections?
> >
> >For a brighter energy future,
> >
> >Geoff Greenfield
> >NABCEP Certified Energy Practitioner
> >
> >THIRD SUN SOLAR & WIND POWER Ltd.
> >340 West State Street
> >Athens, OH 45701
> >
> >www.third-sun.com
> >(740) 597-3111
> >
> >Your free subscription is suppo
> >
> 
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