Question-and-Answer Resource for the Building Energy Modeling Community

Get started with the Help page

1

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

asked 2014-10-24 15:42:39 -0600

Mel
425 ●3 ●10

updated 2015-07-11 17:42:08 -0600

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?

edit retag flag offensive close merge delete

2 Answers

Sort by » oldest newest most voted

1

answered 2014-10-31 10:02:23 -0600

Mel
425 ●3 ●10

updated 2014-10-31 10:03:22 -0600

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.

edit flag offensive delete link

Comments

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 -0600 )edit

1

answered 2014-10-24 16:15:39 -0600

Kyle Benne
6047 ●4 ●9 https://www.openstudio.net/

Does the Input Output Reference clear things up.

edit flag offensive delete link

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Training Workshops

Careers

Question Tools

1 follower

Stats

Asked: 2014-10-24 15:42:39 -0600

Seen: 361 times

Last updated: Oct 24 '14

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

Powered by