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

Can you NOT input a visible transmittance in OS App?

asked 2016-02-03 10:24:10 -0600

Julien Marrec

29706 ●94 ●76 http://www.effibem.com/

For a WindowMaterial:SimpleGlazing, the field visible transmittance is optional.

From the documentation:

This field is optional. If it is omitted, then the visible transmittance properties are taken from the solar properties. If it is included then the model includes it when developing properties for the glazing system. This is the rated (NFRC) value for visible transmittance at normal incidence.

I want this field to actually be calculated by EnergyPlus based on the solar data and not defaulted to 0.31.

Is there a way to NOT input a VT value in the Openstudio App or do I have to call resetVisibleTransmittance on the window using the api?

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2016-02-03 11:07:46 -0600

rpg777
6970 ●6 ●15 http://openstudio.net/

Visible transmittance is an optional value for the OS SimpleGlazingSystem material, too. When I create one of these from scratch in the OSapp, the VT field is blank. If I leave it alone, the material definition in the saved osm does not have this field. Are you seeing different behavior, Julien?

edit flag offensive delete link

Comments

No, you're right, it's blank when you create from scratch. But there's no way to go back once you've set a value. I wanted to reset the VT for a SimpleGlazing that came from one of the OS templates and couldn't do it.

Julien Marrec ( 2016-02-03 11:15:33 -0600 )edit

Ah. Well yeah in that case (if the field is already present), you'll have to blow it outta there with that call.

rpg777 ( 2016-02-03 11:38:14 -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: 2016-02-03 10:24:10 -0600

Seen: 130 times

Last updated: Feb 03 '16

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.

Can you NOT input a visible transmittance in OS App? edit