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How to model window films in EnergyPlus?

asked 2017-08-05 15:45:38 -0500

sirYESsir's avatar

I looked into the EP documentation and didn't manage to find any info regarding window films. I tried using the software WINDOW but I couldn't even open the interface so I gave up on it and tried to model them in EP directly. How can I do it?

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Stop thinking about E+. First, think about what window films do. What property of your window do they affect? Then you should be able to answer your own question.

Julien Marrec's avatar Julien Marrec  ( 2017-08-07 04:15:43 -0500 )edit

My interest in modeling it instead of defining an overall U value is due to the fact that my thesis is addressed to the software itself to which I must explain which objects I added or modified in order to accomplish the retrofit measures I suggest. Only if there's no way of directly modeling something in particular I may change the properties of the existing materials to simulate it.

sirYESsir's avatar sirYESsir  ( 2017-08-07 04:59:22 -0500 )edit

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answered 2017-08-16 14:35:00 -0500

Carlos Vazquez's avatar

For modeling window films, you first have to determine what´s the effect in the U value and Solar Heat Gain Coefficient. LBNL Window allows you to do U value and SHGC calculations for different Insulated Glass Assemblies, but does not have the built-in capability of modeling window films.

I suggest that you become familiar with LBNL Optics software. Here´s the link Download the software, read the manual, and make some testing for yourself. Optics has glass and films libraries and allows you to build assemblies with them. After you make a glass/film assembly in LBNL Optics you can then import it within LBNL WINDOW to model either single, double, or triple glass assemblies. In Energyplus you enter the data for either a simplified or complex fenestration object, but you need to enter accurate data that was either previously calculated or from a product manufacturer.

I hope this is useful for you. Best Regards.

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Asked: 2017-08-05 15:45:38 -0500

Seen: 589 times

Last updated: Aug 16 '17