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

Unacceptable heat transfer coefficient values

asked 2019-12-21 23:32:38 -0600

Amir Tabadkani
105 ●1 ●6

updated 2020-01-07 16:49:27 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Dear Community,

I have modeled a simple shading system over a single window (venetian blinds) with a glare control on it, but when I output the Hcv on hourly basis, there are some hours that Hcv value is equal to 1000 between the shading system and outer layer of the window!

It seems there is sth wrong within the idf file but I could not find any clue.

Your help is highly appreciated on this issue.

Regards Amir

C:\fakepath\2019-12-22_163028.jpg

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2019-12-22 20:46:50 -0600

shorowit

11811 ●200 ●9 https://www.nrel.gov/b...

Refer to the E+ engineering documentation on exterior convection where it says:

Note that when the outside environment indicates that it is raining, the exterior surfaces (exposed to wind) are assumed to be wet. The convection coefficient is set to a very high number (1000) and the outside temperature used for the surface will be the wet-bulb temperature. (If you choose to report this variable, you will see 1000 as its value.)

edit flag offensive delete link

Comments

Thanks a lot @shorowit

Amir Tabadkani ( 2019-12-23 02:28:49 -0600 )edit

add a comment

Your Answer

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

Add Answer

Training Workshops

Careers

Question Tools

1 follower

Stats

Asked: 2019-12-21 23:32:38 -0600

Seen: 159 times

Last updated: Dec 22 '19

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.

Unacceptable heat transfer coefficient values edit