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How to model window films in EnergyPlus?

asked 2017-08-05 15:45:38 -0600

sirYESsir gravatar image

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 gravatar imageJulien Marrec ( 2017-08-07 04:15:43 -0600 )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 gravatar imagesirYESsir ( 2017-08-07 04:59:22 -0600 )edit

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answered 2017-08-16 14:35:00 -0600

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 https://windows.lbl.gov/software/opti.... 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 -0600

Seen: 195 times

Last updated: Aug 16