Re: cool/cold climate greenhouse
- I had a friend in the A/C biz tell me that you should never expect your heat/cool mechanism to make more than a 20 degree Farenheit difference between the indoors and outdoors, or else you are spending way too much money and overburdening your equipment. If it's cold inside, put on longjohns and a sweater, if it's pleasant, open the windows (why I never could stand working in an office or retail store ... Claustrophobia!)
I've always wish I lived at Amory Lovins' house in Colorado, with banana trees in the greenhouse. But that kinda emphasises my point that it's easier to maintain a greenhouse in the cold than in the heat. Same with our house here in Texas. You can put on longjohns and a sweater, and sit by the fire on chilly days, but when it's 99 degrees in the shade with 99% humidity, ain't nowhere to run, nowhere to hide, and the A/C bills are horrendous. This big old barn is not too difficult to cool, as the wide eaves prevent the sun from hitting the glass until late afternoon, when I pull the same thick, insulating drapes we use to keep out the winter drafts.
~Traveler in Thyme, zone 8-9
- Thats very intresting, thanks for the links!
More on heating greenhouses in substainable & energy efficient ways:
Has any of you done any experimenting with compost-heating?
--- In email@example.com, "Ossi Kakko" <ossi@...> wrote:
> Just want to let you know that Jerome Osentowski in Central Rocky Mountain
> Permaculture Institute has excellent cool/cold climate greenhouse design
> utilizing the subterranean heating and cooling system, aka climate
> battery. See more info:
> :) ossi (from finland)
> > You have to have lots of panels and lots of storage capacity to handle the
> > nights and the unexpected days when there is cloud cover. In northern
> > latitudes, solar in winter is a dream or a very, very expensive reality.
> > From experience, it doesn't take many hours to drain a storage bank if it
> > is not being replenished every day and I do mean every day. An overcast
> > day is a big, big problem. Two days in a row means turning on the mains
> > or a generator. When ever I look at a so-called off-grid setup, the
> > moment I see a generator is the moment that I call foul.
> > Since you are trying to minimise heat loss, it would seem to make sense to
> > look at construction. Obviously, south facing is critical. If that's
> > where the sun is strongest, why expose the northern wall to the air?
> > Insulate it, ideally, by building into a hill side and burying all but
> > that south wall. Build on a concrete slab that is painted black.
> > MikeH
> > --- In firstname.lastname@example.org, john willis <wilf1946@> wrote:
> >> Hello Traveller in ThymeTotally agree about heating greenhouses with
> >> fossil fuel but I do feel they are pretty good passive solar collectors
> >> on sunny days and also pv panels can be used to charge batteries for
> >> nights and dark days.JohnMW
> >> To: email@example.com
> >> From: traveler.in.thyme@
> >> Date: Wed, 2 Mar 2011 13:59:36 +0000
> >> Subject: [pfaf] Re: overwintering tomatoes in greenhouse