Thank you for all the help and advice.
Lightning, I think it works good. The water temp is about 140, slab inlet temp 72 slab outlet temp 62. My feet are not cold, it is nice to have some extra heat blowing, not a lot on this floor area 1500 sqft plus a 1500 sqft second floor in this gambrel barn. I will do some temp measurements before and after the heat reclaimer.
Rob, you are probably right but i do like to have the possibility to hand stoke and burn wood
Greg, I studies that post, VERY IMPRESSIVE, I noticed the fins that why I new that it was an EFM in the scrap yard but is gone now.
I heard that the square area of the EFM is 22 sqft. Not much more then what I have here.
This morning I found a large build up of ashes on the K8. The rice was dropping over the side. To much air?? or to much draft with the old setup? Burned about 40LBS coal during the night.
Today I mounted a motor actuated damper in the flue pipe. The damper disk is smaller then the pipe so it always allows some draft.
This is an experiment , as the whole project is, but I felt that my draft was way to high.
With the motor damper set so that the baro barely opens the draft over fire is -0.02 with fan running and -0.035 at idle.
My ON /OFf cycle to maintain 140F water temp to heat the slab is about 1 to 4 . The flue temp before the baro in the center of the pipe is 320F On and 250 OFF. I am measuring it with a wire thermocouple and that responds very fast.
My timer is 20 sec ON 80 sec OFF . I need to get a better timer to get longer ON and OFF times. Overall I think I am getting closer to the desired temps.
The other thing I did today was lining the bottom of my coal bin with tin to make it more slippery and also prevent the bottom from rotting out over time.
This one holds 3.5 Ton of nut or I guess about 3 ton of rice. My supplier says that the rice is heavier and that it could hold 3.5 ton as volume as well . We will see the rice is coming Monday at $ 240 / ton delivered.
I did work also on the gaps and made a filler plate but there are no real seals. No cleaning yet as I still want to compare.
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- double angle coal bin ( front removed)