what size/kind of blower or fan to put behind this?
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It's going to depend on a lot of variables. Size of barn/height of ceiling/R value of walls&ceiling/temp you want to achieve/total area heated/entry temp of fluid/in a case or freestanding like in photo & a pile more. Sorry to be of so little help. Really you can stick any fan behind it & get some heat gain, however your question asks how much fan & that involves nailing down a lot of those variables & then some math.
Without knowing the heat transfer specs of the hx it would be a guess. Get a squirrel cage furnace fan from the junkyard and rig it up. a horizontal furnace would make a fine chassis to mount it in. Try it and see.
Monitor flow through the hx, inlet and outlet temps and calculate heat delivered.
Monitor flow through the hx, inlet and outlet temps and calculate heat delivered.
Look at the modine website and find one with the same size heat exchanger and 'borrow' their specs regarding the fan/motor.
To be honest in this situation I would be going to my local HVAC & asking what they had for a scraper (something that the heat exchanger went on) but otherwise is in good condition, just not worth the repair or was scraped & replaced under warranty.
If you can get one with a 3 speed fan...bonus as you will be in low speed say oct/nov-mar/apr & have the other two speeds in your back pocket should it get cold.
Something that was capable of 30K - 40K btu in low speed should be OK for that area without knowing specifics about R value/air infiltration/location specific to wind/number & size of windows & doors, how fast you want to be able to bring temps up, etc.
Bonus is going this route keeps cost to a minimum & you wont be too bent should it become plugged with dust from the barn as well as the dust taking out bearings prematurely. If your barn is like mine looks don't matter, just performance.
Up here I would be trading that scraped, but just what I want unit for 40 ounces of his favourite. Hard to beat that price. Plus I know exactly what the price of a replacement will be in the future.
If you can get one with a 3 speed fan...bonus as you will be in low speed say oct/nov-mar/apr & have the other two speeds in your back pocket should it get cold.
Something that was capable of 30K - 40K btu in low speed should be OK for that area without knowing specifics about R value/air infiltration/location specific to wind/number & size of windows & doors, how fast you want to be able to bring temps up, etc.
Bonus is going this route keeps cost to a minimum & you wont be too bent should it become plugged with dust from the barn as well as the dust taking out bearings prematurely. If your barn is like mine looks don't matter, just performance.
Up here I would be trading that scraped, but just what I want unit for 40 ounces of his favourite. Hard to beat that price. Plus I know exactly what the price of a replacement will be in the future.
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