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Outdoor Wood Boiler Setup
First time joining although I have visited the site many times and I appreciate all the advice on here.
I have done service, repair, and installation on residential systems for 7 years (not long). However, I have never installed a wood boiler before. This system is being installed as the primary heat source for two shop buildings. They have a Crown Royal Pristine 7400E Outdoor Wood Boiler which is 390K BTU Output.
One building is 100ft away from the OWB and will have two Modine hanging heaters. They installed the insulated underground pipe which included 2 - 1" Pex tubes before I had got involved with the job. My opinion is the pipe will possibly be undersized to be able to run 2 - 120k BTU Modine Heaters but that is a different topic.
The second building is located within a few feet of the OWB. This will include 2 - 63K Modine hanging heaters and a small office area of in slab radiant that will require 18K BTU/HR
My thought is to have two independent pressurized systems one for the first building and one for the second building. The OWB has two separate outlets which should work well for what I'm thinking. I believe it would be impossible to pump water the distances and elevations that I need without doing it this way.
Please see the attached sketch of what I had in mind for the second building. Am I missing anything or should I change anything that I have planned. Second question is, how do I size my flat plate heat exchanger for this purpose? Most of them are spec'd for DHW, radiant, or snow melt which would require low temperatures where I'm trying to achieve higher temps to allow the Modine heaters to work properly. I have tried a calculator that I've found but I don't know If I'm getting the right output. Ideally the OWB would put out 180-190 degree water to the flat plate and as hot of water that I can get out and over to the Modine heaters.
Thanks I appreciate any input.