My quest for an outdoor gasifier setup continues. I find myself drawn to the Garn. My installation would have the Garn (1500) outdoors, sheltered in a Garn barn. I would insulate as much as possible...so minimum of R38 from the boiler metal shell to the outside walls. Likely higher.
I'm curious about what level of temperature drops Garn users see. Integral storage is a huge advantage of the GArn, but obviously dropping all the heat outside isn't ideal. I really want to keep the fire/mess outside.
What is the killer is the huge DeltaT, i.e. the huge thermal gradient to encourage temperature loss. We are talking over 200 degrees F here in temp differential (garn water to outside air temp) on cold winter days. So while the amount of temp drop will be very strongly garn barn dependent, I'm curious what people actually measure. I have in-floor radiant, so don't need water over 120 degrees (save for hot water), so I might imagine losing quite a bit of BTU's as I won't really use the high temperature water immediately.
A brief mention of "average" temperature drop in the winter (or whatever you have), in the summer days, as well as a brief mention of your insulation would be great. Others would storage, I'd be interested in hearing the same things for your storage system. 400 sqft. of Garn barn, insulated at R-40, with a temp differential of 100 degrees should be dropping 1000 BTUs/HR. I think the 1500 is 11000 BTUs/degree change....so this would be only a few degrees a day. I find that an unlikely achievble number. Just looking for data from experience....
Thanks!
Bruce
PS---> Would you buy a Garn again? Would you look at something different?
I'm curious about what level of temperature drops Garn users see. Integral storage is a huge advantage of the GArn, but obviously dropping all the heat outside isn't ideal. I really want to keep the fire/mess outside.
What is the killer is the huge DeltaT, i.e. the huge thermal gradient to encourage temperature loss. We are talking over 200 degrees F here in temp differential (garn water to outside air temp) on cold winter days. So while the amount of temp drop will be very strongly garn barn dependent, I'm curious what people actually measure. I have in-floor radiant, so don't need water over 120 degrees (save for hot water), so I might imagine losing quite a bit of BTU's as I won't really use the high temperature water immediately.
A brief mention of "average" temperature drop in the winter (or whatever you have), in the summer days, as well as a brief mention of your insulation would be great. Others would storage, I'd be interested in hearing the same things for your storage system. 400 sqft. of Garn barn, insulated at R-40, with a temp differential of 100 degrees should be dropping 1000 BTUs/HR. I think the 1500 is 11000 BTUs/degree change....so this would be only a few degrees a day. I find that an unlikely achievble number. Just looking for data from experience....
Thanks!
Bruce
PS---> Would you buy a Garn again? Would you look at something different?