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2019-04-25 10:24:43 -0600 commented answer modeling two mobile shadings in EnergyPlus at the same ? one as interior and one as exterior

Insert the following in your idf: WindowsCalculationEngine , ExternalWindowsModel; Check other I/O information in In

2019-04-17 11:12:50 -0600 answered a question modeling two mobile shadings in EnergyPlus at the same ? one as interior and one as exterior

If you use WinCalc engine option, you will be able to model multiple shading systems.

2019-01-29 15:41:41 -0600 answered a question Define optical properties based on angle of incidence

If you use WINDOW program from LBNL (windows.lbl.gov/software), it will give you option to create EnergyPlus file (IDF i

2017-02-17 01:18:04 -0600 answered a question Error: ** Severe ** ProcessSurfaceVertices: Divider area exceeds glazed opening for window...

From window coordinates, your window seems to be horizontal one. So it is not clear to me what "horizontal" and "vertical" divider means in this case. Perhaps they are reversed. Try specifying 0 vertical dividers and 6 horizontal dividers.

2017-02-09 17:32:31 -0600 commented answer blinds.xml has negative thickness

Please email to: dccurcija@lbl.gov.

2017-02-09 16:09:23 -0600 commented answer blinds.xml has negative thickness

Thanks for pointing this out. Can you send the copy of XML file, so that we can look into this? Thanks.

2017-02-09 09:55:19 -0600 commented answer blinds.xml has negative thickness

Thickness is used in WINDOW for thermal calculations, so it should not affect Radiance modeling. However, if you want to calculate SHGC or U-factor in WINDOW, then you should edit xml file and put proper thickness.

2016-09-09 11:24:45 -0600 commented answer THERM: Added Material Layer, R-Value decreased

The reason that configuration without fiberglass panel gives better R-value is that in that configuration, both steel studs are exposed to air cavity, while in the case of configuration with fiberglass panel, only one has exposed side to air cavity. Since steel has lower emissivity than fiberglass (0.6 vs 0.9), that makes the small, non-intuitive difference in R-value. If the fiberglass panel was more insulating, this radiation heat transfer effect would be less pronounced and would result in expected behavior (i.e., configuration with fiberglass panel would be more insulating).

2016-09-08 22:34:35 -0600 received badge  Teacher (source)
2016-09-08 20:31:24 -0600 answered a question THERM: Added Material Layer, R-Value decreased

Adding a layer in a 1-D construction will always increase thermal resistance. Normally, this should happen in 2-D and 3-D constructions, but there may be some thermal bridging effect that can cause reversal. Can you please send both THERM files, so that we can look at it? Thanks.

Charlie Curcija, LBNL Windows and Daylighting Group