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minitube for snowmelt

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Bobcat_2
Bobcat_2 Member Posts: 8
in THE MAIN WALL
I've used minitube style delivery from boiler room to separate zoned buildings successfully. Loads for this heated storage were minimal 15 to 20 Btu/ft even when delivering heat to 80,000 sq.ft. in ten different buildings. This 1.4MM Btu boiler, copper finned, atmospheric works just fine even though the owner really hugs the minimal temps to stay just above freezing. Now a different job looks good for a similar, albeit cost effective, application for minitube. This snowmelt delivery system shall handle about 150 Btu/sq.ft. (or more). 6,000 to 12,000 sq.ft. of sidewalks and loading docks will be demanding of a poorly designed minitube system. Can someone offer design help for this type of system? 500 ft. loops of one inch barrier PEX 12 inches O.C. I'm OK designing this part for gpm and load. I'm not too confident in using the minitube to get the temps to the outer manifold/pump station. Comments?
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