[Strawbale] Drilled Well to Heat Greenhouse?

[Shody Ryon]

Hi Speireag,
There was someone in Canada that was using passive
solar as the only heating system to warm his
greenhouse in the winter. I think the idea he was
using was to build long in the east west direction and
narrow in the north south direction to take advantage
of the solar energy. As I write this it, doesn't make
a lot of sense. He also had a cob bench as thermal
mass. I was amazed to hear that he could do this. I
don't remember which list he was on, but I think it
was this one. I was wondering what area are you in and
what crops are you growing, if that might help with
advise. Another way to grow might be to grow indoors
with insulation and grow lights. this method sometimes
gives more control.

Cheers,
Shody

--- Tim Chamberlain <spike at earthnet.ws> wrote:

> Speireag
>    
> With a heat source of 50F, without a heat pump, you
> don't have much of a 
> temperature difference to push heat into your
> greenhouse. You're also 
> going to impede heat flow using a loop of PEX in the
> well compared with 
> pumping well water directly through the floor. I
> think you would be 
> better off using a wood stove or active solar.
> 
> Tim
> 
> 
> Speireag Alden wrote:
> > Howdy, all.
> >
> >      To keep a (strawbale) greenhouse at workable
> > temperatures in the winter where the water table
> is only
> > twenty feet down:  what about drilling a short
> well and
> > running a loop of PEX down into it, and then
> pumping water
> > or coolant through it, and through loops in the
> floor of
> > the greenhouse?  With ground water at 50 degrees
> > Fahrenheit year-round, and a pump controlled by a
> > thermostat, the only power cost would be to run
> the pump.
> >
> >      Cost would be about $1000 for the well, say
> $250 for
> > the pump (less if it's not brass) and electricity
> as
> > needed (which could be from a solar panel if the
> loops are
> > running through substantial thermal mass).
> >
> >      What do you think?
> >
> > -Speireag.
> >
> >   
> 
> 
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> 



       
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