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Old 03-28-2012, 08:31 PM   #1
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BTU Calculations


Anyone have a good site and/or formula for BTU calculation loads?

I'm researching ventilation air heating requirements and am trying to find out:
640cfm @ delta T 15 deg. F rise (100% humidity) = ?BTUs?
640cfm @ delta T 15 deg. F rise (50% humidity) = ?BTU?

It's for intake air from a geothermal source (55 dwg. F +/-) being brought to room temp (70 dwg. F +/-) with the varying humidity loads. I'm not looking for exact stuff, just theoretical schematic planning stuff...Thanks!

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Old 03-29-2012, 05:23 AM   #2
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BTU Calculations


(TR*1.08)*CFM=BTU

15*1.08=16.2
16.2*640=10,368 BTUs of heat.

The humidity won't matter, 100%RH compared to 50%RH has less then a 20 BTU an hour difference.

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