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Old 06-05-2009, 09:10 AM   #1
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Question for Beenthere


Been:

On the 'talk' forum, you replied to 'low amp draw' and asked if the WB temps were taken for supply and return to calculate actual capacity.

Could you elaborate, please, how that is done using those values?

Thanks.

V

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Old 06-05-2009, 04:50 PM   #2
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Question for Beenthere


You convert wetbulb to enthapy(BTUs per pound of dry air).
Then multiply the enthapy difference by the CFM and by 4.5 to get total capacity.

EG:

Return, 76DB 63 WB=28.477BTUs per pound dry air.
Supply, 56F DB 54WB=22.602BTUs per pound dry air.

28.477-22.602=5.875 Enthapy Delta.
5.875Enthapy DeltaX4.5Seal Level Constant=26.437X1000CFM=26,437BTUs total capacity.

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Old 06-06-2009, 06:35 AM   #3
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Question for Beenthere


Quote:
Originally Posted by beenthere View Post
You convert wetbulb to enthapy(BTUs per pound of dry air).
Then multiply the enthapy difference by the CFM and by 4.5 to get total capacity.

EG:

Return, 76DB 63 WB=28.477BTUs per pound dry air.
Supply, 56F DB 54WB=22.602BTUs per pound dry air.

28.477-22.602=5.875 Enthapy Delta.
5.875Enthapy DeltaX4.5Seal Level Constant=26.437X1000CFM=26,437BTUs total capacity.
Thanks, Been
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