Mark I would agree that several different methods will be more likely to produce consistent results. Dpack, that is pretty well the way they used to do it I think, but usually for a long period they used a heap rather than putting it at the bottom of a trench.
I think you have a good few ideas to help you heat your green house Otley Lad.
OtleyLad
Joined: 13 Jan 2007 Posts: 2737 Location: Otley, West Yorkshire
Mark I would agree that several different methods will be more likely to produce consistent results. Dpack, that is pretty well the way they used to do it I think, but usually for a long period they used a heap rather than putting it at the bottom of a trench.
I think you have a good few ideas to help you heat your green house Otley Lad.
I can see it now - a greenhouse up to the eaves in manure (sat over a 2 metre deep thermal store. Half the roof has a PV panel (driving a fan to circulate the air from the below ground thermal store) and the other half a Thermal panel - with just a crack in between so the light can get into the 3 lettuce plants (I know 3 sounds a lot but I'm an optimist you see).
Think you could reduce the dimensions of the manure heap etc. slightly so you could get 4 lettuces in.
alison Downsizer Moderator
Joined: 29 Oct 2004 Posts: 12918 Location: North Devon
Posted: Sat Jan 31, 15 7:19 pm Post subject:
I asked Brigit, on FB and this was her answer about the sink hole.
Brigit Strawbridge Hi Alison, it helped a little, but the size of the sink was not large enough for it to be hugely effective. For it t make a big difference you would need the sink to be as large and as deep as possible. Hope this helps x