Mike Jay wrote:Hi Kenneth, welcome to the conversation!
I am a bit worried about the compost IN the greenhouse for the ammonia reason. Some of my thinking/hoping:
With a primarily "brown" wood chip compost it may not produce as much ammonia as a "properly" C:N balanced hot/fast compost pile. I believe the NAI/Fulford system and the Bioshelter Market Farm have compost inside but both are manure intensive. By putting it inside the GH I get to harvest all the heat it generates, not just the bit I can circulate away with water. If the gasses are overpowering I could seal the compost chamber to keep the ammonia in. Aeration air would still route heat through the South grow bed but then exhaust outside. Downside is no CO2 benefit from the compost. I don't have any room on any side of this greenhouse for an external pile. So if I want it outside, that reduces the size of the greenhouse. If I had a big field to put it in I would have more options.
But my hopes/thoughts are based just on reading and dreaming. Do you think your compost would have offgassed as much if the C:N ratio was tilted more towards "browns"?
My main compost heat harvesting methods will be:
Radiation/convection off the surface of the hopper 4" pvc pipes that enter the chamber near the bottom, rise up through the pile and then exit the top to create chimneys of ambient air heating Aeration air being sucked through the pile and then blown through the South planting bed Option to add coil of pipe on the underside of the roof of the chamber to circulate water through.
I'm hoping to not coil pipes through the middle of the compost so that loading and unloading won't be a massive pain in the ass.
I do like the simplicity of running low grade heat through pipes that are shallow in the ground. Perhaps on the surface and covered with mulch so that when I'm digging I don't have to worry about puncturing pipes.
I did see the Builditsolar plan for the check valve at one time but the link isn't working any more. Do you have a copy of it by any chance?
Kenneth Elwell wrote:Making the compost more towards "brown" would definitely have solved the ammonia problem.
Kenneth Elwell wrote: the compost exhaust can be bio-filtered through finished compost under the seedbeds (pgs. 96-97 of GB's CPWH shows one example) which handles the ammonia and odors, but also keeps the CO2 inside.
Kenneth Elwell wrote:Why not make your North wall/roof more conventionally framed? (like the Univ. of Missouri solar GH) It could have a vertical wall that might make shelving or hanging of your SHW pipes easier, and make that clipped NE corner easier to frame.
It would save the time of making the (now a different shape) trusses for the North side, and maybe shorter time to complete. (My projects seem to take three times longer than I hope...especially if there's "custom" parts I'm making)
Lots of things get simpler, flat wall panels for insulation and sheathing without cutting strips, joist hangers and brackets that fit the lumber...
Ebo David wrote:@Mike, we should be able to feed you with hardware/software designs, etc. to make it happen. The sensing is little more than: