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combined solar and heat pump

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Posted by gosolar23 on November 21, 2005, 10:55 pm
 
It seems to me that there might a combination of large volume, low
temperature storage and heat pump.  Maybe 10,000 gallons.   This would
help increase efficiency and provide backup heat for a run of dark,
cloudy cold days in seattle.

Does anyone have any experience with such?   How big are heat pumps,
how expensive and reliable are they and can they transfer heat from
water to water?

Eric

I did some searches of alt.solar.thermal and it has piqued my interest.


Posted by SJC on November 22, 2005, 5:19 pm
 
: 7bit


It seems to me that there might a combination of large volume, low
temperature storage and heat pump.  Maybe 10,000 gallons.   This would
help increase efficiency and provide backup heat for a run of dark,
cloudy cold days in seattle.

Does anyone have any experience with such?   How big are heat pumps,
how expensive and reliable are they and can they transfer heat from
water to water?

Eric

I did some searches of alt.solar.thermal and it has piqued my interest.

I think that ground source heat pumps transfer heat from fluid to air.
Maybe that would work to recover the heat from the warm water tank.

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<DIV>"gosolar23" &lt;<A
t; wrote
in message <A
1132613751.176813.242830@g43g2000cwa.googlegroups.com</A>...</DIV>
<DIV>It seems to me that there might a combination of large volume,
low<BR>temperature storage and heat pump.&nbsp; Maybe 10,000
gallons.&nbsp;&nbsp; This would<BR>help increase efficiency and provide =
backup
heat for a run of dark,<BR>cloudy cold days in seattle.<BR><BR>Does =
anyone have
any experience with such?&nbsp;&nbsp; How big are heat pumps,<BR>how =
expensive
and reliable are they and can they transfer heat from<BR>water to
water?<BR><BR>Eric<BR><BR>I did some searches of alt.solar.thermal and it has
piqued my interest.</DIV>
<DIV>&nbsp;</DIV>

<DIV><FONT face=Arial size=2>I think that ground source heat pumps transfer heat
from fluid to air.</FONT></DIV>

<DIV><FONT face=Arial size=2>Maybe that would work to recover the heat from the
warm water tank.</FONT><BR></DIV></BODY></HTML>


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Posted by Jeff Thies on November 22, 2005, 7:42 pm
 gosolar23 wrote:


As far as heat pumps go you can look into mini-splits, they are small
versions of whole house heat pumps. You can also look at ground source,
although I don't know if those come in mini splits.

Bear in mind I don't have solar experience... but... It's hard too see a
significant advantage of a large low temp storage over a smaller higher
temp when both store the quantity of heat. Going through the extra step
of raising the temperature with a heat pump.

This is different than a ground source heat pump where more heat is
conducted in naturally, rather than having to be supplied.

   Maybe crunching some numbers would help, but I see lots of problems.

We need a FAQ with basic equations and maybe a little javascript to help
grind the numbers. I can contribute web space and programming. Just a
central repository with Nicks (and others) equations would be nice...

   Cheers,
Jeff

    This would


Posted by Solar Flare on November 22, 2005, 9:14 pm
 I was beginning to consider a scheme such as this but
with a factor of 3:1 for the electrical energy put in
and our NG prices at about 1/3 the mechanical
complexity addition is not welcome for my application
and pricing right now.

You could put ice cold water into your solar panels and
absorb much more heat from the sun with less insulation
and absorber complexity.


message

large volume, low

gallons.   This would

a run of dark,

are heat pumps,

transfer heat from

piqued my interest.



Posted by gosolar23 on November 26, 2005, 2:22 am
 Solar Flare.

I think my ground temperature is around 50 degrees.  When I mean low
temperature, I mean  probably 80 to 100 deg F.   That seems like a big
differential to me.

The heatpump would require less energy and one would not need to  to do
all that expensive  vertical drilling $0,000.

In the summer, all heat from airconditioning would be recovered.



Eric


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