SPAM: Re: DC heat? [RE-wrenches]

[Ken Schaal]

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Another option regarding heat pumps would be earth-coupled, ie. direct water
source or ground loop heat exchange.

Ken Schaal of CommonWealth Solar, LLC


----- Original Message -----
From: "Christopher Freitas --- OutBack Power" <cfreitas at outbackpower.com>
To: <RE-wrenches at topica.com>
Sent: Monday, November 21, 2005 10:29 PM
Subject: RE: DC heat? [RE-wrenches]


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Todd Cory wrote:
>
> Why not gain 200 to 200% and use a heat pump?

That is what Ian was suggesting in his message - with a 3:1 COP you
essentially have a 300% increase in the heat produced per watt consumed.


The challenge is keeping the amount of dump load proportional to the
output of the windturbine(s).  This is a little easier to do with a
hydro system as it operates more steady state.  With an AC or DC
resistive heat load you can PWM it or at least turn it on and off every
minute or so - heat pumps will not tolerate this and should be left on
for relatively long periods of time.

One solution is to use several small AC powered heat pumps which can
then "follow" the turbines power production better.  The unfortunate
nature  of a heat pump is that a small one is almost as expensive as a
larger unit.  Most of the cheap small ones are actually "portable" air
conditioners which draw about 10 amps AC at 120VAC - there also are
several brands of water heater heat pumps which might be an option.

Here in western washington where it usually is above 40F heat pumps are
an option.  If much of the winter is below 40F - forget it. Utilizing
partially heated air from a greehouse or other passively heated space is
another way to improve the performance in a cold climate.


Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030

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