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For convectors/baseboard what does U-factor times area (btu/h*R) actually mean in OpenStudio?

asked 2014-10-24 15:42:39 -0500

Mel
425 ●3 ●10

updated 2015-07-11 17:42:08 -0500

flag of United States of America

4436 ●5 ●17 http://bleedinggreenna...

For convectors/baseboard, when I'm modeling an existing building, instead of auto sizing I'd like to enter in btuh of the existing equipment but the field is U factor times area. What does this actually mean? Btuh divided by the delta T?

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answered 2014-10-31 10:02:23 -0500

Mel
425 ●3 ●10

updated 2014-10-31 10:03:22 -0500

Thank you. the answer is: UA is the heat transfer coefficient. q=UA*DeltaT, so the UA is btu output of the convector or baseboard divided by the delta T in deg F across the convector or baseboard when working in English IP units.

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This is wrong. Delta T is between the average water temperature and the average air temperature, not the deltaT across the coil of the same media

TheEnergyTutor ( 2022-05-09 09:58:44 -0500 )edit

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answered 2014-10-24 16:15:39 -0500

Kyle Benne
6027 ●4 ●9 https://www.openstudio.net/

Does the Input Output Reference clear things up.

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Asked: 2014-10-24 15:42:39 -0500

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Last updated: Oct 24 '14

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