I like it.
Would you use a powered fan to blow the greenhouse air through or would you use a trombe wall style passive system?
Another thing I was wondering about and didn't see in the drawings was if you have plans for forming the large "umbrella" that is a big part of the AGS system or some other means of separating the soil used as the "thermal battery" from the rest of the earth.
Sean Kettle : You need to consider more than the foot print of the dwellings - as drawn you Potentially have a Greenhouse setting in a Cold sink!
A pond no deeper than a foot placed in front of the greenhouse would help here increase both solar energy and act as a temperature buffer ! greatly !
For the Good of the Cause ! Big AL
susan vita wrote:I'm working out whether a greenhouse under the barn is do-able in this area.
The land has many fresh water springs and is also very well drained, I'm thinking of manure storage under the critters in the greenhouse will heat the water and the air nicely if I can achieve proper ventilation and humidity control.
Of course eventually that organic compost will be used in the greenhouse if all goes well.
Barn is yet to be built, my dream is to make it all efficient to work in and pleasing to be in--including a breezeway from garage to barn in case one wishes to avid the weather somedays all together.
We get deep dark and cold winters here for a minimum of six months, so it's very important the space be comfortable to work in.
Heck I even add another floor for living space above the animals, I had a lovely apartment over a working barn once, and would totally do it again.
Thoughts or ideas or very welcome, this is not part of my natural skill set!
susan vita wrote:Yup, that kind of gravity fed system using pigs and hens where appropriate.
I need to read up on round barns--the one at Shelburne Museum in Vermont is a great example.
My goal is to incorporate a greenhouse on the lowest level, earth bermed on three sides, glass on the south. That manure produces such heat, I know I can figure out a way to capture it .
Maybe even add fish someday...!
Lindsey Schiller wrote:Sean,
I think this is a very cool variation on the traditional concept.
I can see a few problems with your sketch though. First, the tube is way too long as you have in your sketch (assuming you have a normally sized house). It will severely diminish air flow given that length. Besides, it's not generally needed -- you can get complete heat transfer (between the air and soil) with a shorter length. Usually earth to air heat exchangers use multiple sections of pipes with multiple fans to get more airflow.
Article you may find helpful: http://www.ceresgs.com/#!10-Dos-and-Donts-for-Designing-a-Ground-to-Air-Heat-Transfer-system/cf3k/55131f4c0cf2aa18115c5439
I don't know how to deal with the high water table, but that should be a major point of concern.
Lindsey Schiller wrote:Sean,
Heat always rises so it will enter low, rise and be exhausted top. I would speculate extremely low air flow rates, if they are detectable at all. My speculation. Cold air will take the natural convection route - straight up, still within the greenhouse -- unless there is a huge temperature differential creating a chimney effect (draft) within the mass. I would presume not nearly enough. So I'd advise sticking to something closer to a conventional trombe wall if going the passive route. Doing that on multiple levels... I'll leave that to others comments.
Glenn Herbert wrote:Once-through passive heating will not work for you - throwing away all the heat generated and replacing it with 100% outside air doesn't make sense. You need a recirculating flow if you are using air.
A thermal mass that is underfloor will absolutely need some circulating tubes (air or water or...) to get the heat into its back end. A passive system would require the mass to be more vertical, like a thick trombe wall. You could put gaps in it for direct south view from the living space.
Dan Mangan wrote:Maybe you can plant a bunch of thirsty plants heavily around the area. Maybe a willow. I've heard the drink lots of water. Just an idea though. Or corugated pipes and a crock might do some work. Instead of plastic sheeting also a thicker shield would maybe be better.