Joseph Fetherolf wrote:Hey all, new to this site and forums in general.. but my reason for posting here is to access the collective mind. As we all know two heads are better than one. Right, so, on to the main reason i'm here.
I am trying to heat a 30x96 greenhouse with a rocket stove! I know it will have to be bigger, but how big? I have drawn up some plans that give the heater a kiln-like firebox. Also does this mean I will need a larger riser? I'm thinking no.. because the main objective of the firebox is to be able to hold lots of wood so you can walk away from the stove, but I'm certainly no expert..
In addition to all this expansion of the heater business, it was also an objective of mine to pull as much heat as possible from this stove. To achieve that I have decided to go with Geoff Lawtons model of a boiler. The only exception being instead of running the water to a faucet or shower I will circulate it Beneath and Around our Aquaculture tanks. The remaining hot air will then be snaked through a thermal mass(such as in traditional RMH's).
Dim. of the Firebox are 2'Wx3'Lx18"H (it'll have a parabolic shape to it)
How much heat will this stove put off?
Will it heat this space? If not how big will it need to be??
p.s. this is Lawtons video for those who have not seen...http://www.youtube.com/watch?v=1oDpmmsqHwQ
allen lumley wrote: Amos Valenti : Knowing that it will be difficult to keep fire wood dry in a greenhouse - what have you worked out for wood storage ? Big AL !?
Brooks Miller wrote:hi frank - thats awesome - looks like you've spent some time with sketchup!
i have a few questions/critiques.
my only immediate concerns with putting the pipe directly into the water would be water tight welds/unions, loss of volume (space for fish to live in considering size of an aquaponics greenhouse), and how you would control the heat.
my idea with heating a tank of water and then moving it was because you'd be able to put the circulation loop in the pond on a thermostat so you don't go overboard on heat....but maybe you kinda can't go overboard?? i think the cool part to me about heating the water is that then whe you use water to irrigte, you're irrigating and spreading that heat out into the whole greenhouse more evenly.
1. how hard is it to cut rock wool plates, where do you get them, and how good are they at insulating?
2. whats up with leaving the top of the first piece of the heat exchanger uninsulated?
3. how would you make the stainless below the surface watertight? do you have access to a TIG welder onsite? what size pipe wall?
4. are the pipes in the bottom of the water representing your irrigation pipes?
looks great, and thanks for sharing.
an update to my design is that we've done some rough figuring and think that just heating a mass beneath the fodder trays may actually be enough to heat the whole thing....that way our cob mass running through the brooder sections radiates up and warms trays, and the plant water pulls the heat into the pond.
cutting and setting posts today - ill "post" some pics tonight!
Amos Valenti wrote:
Joseph Fields wrote:I know this is a little off topic. Does anyone have any kind of removable insulated hip walls in your greenhouse. I was thinking of filling some sandbags and building hip walls around the inside to keep the cold from creeping in at ground level. Then I recalled how much filling sandbags sucks and thought I would ask for advise. I was thinking wood chip filled bags would be a lot lighter to take down in summer time.
We have used bails of hay/straw in the past and it seems to be effective.
Jennifer Charlton-Dennis wrote:Wow Amos,
That is an amazing greenhouse you have there! How has the gravel been so far as a thermal mass? We live just near Cleveland so our climate is pretty much the same. As soon as we get our property we're planning on the same type of greenhouse with the in ground RMH. So damn cool!! Keep us updated!!
Marty Spehar wrote:Nice setup Amos. How does it heat the greenhouse? what route does the smoke take? i.e. is there cob under the grrnhouse floor and around the fish tanks?
Still working on my rocket stove, added some cob yesterday, here's a pic of where I'm at now.
Amos Valenti wrote:Copy that success Marty, Congratulations!
We stopped burning at around 10:30 pm. Approx burn time 5 hours. Coldest point in night was 17F. Internal temp of greenhouse at 6:30AM was 52F degrees before the sun.
allen lumley wrote:
What is your 'Burn box' and what is it made of, Actually counter-intuitively you do not want to try to take heat off of the Combustion zone, in order to get the Freaky High
Working Temperatures that guarantee the super efficiencies of a Rocket type stove we do not want the cooling effect of water that can never get hotter than Boiling !