How to input Glass spectral and Incident Angle Transmittance and reflectance

asked 2021-09-30 03:01:50 -0600

it
123 ●4

updated 2022-02-06 12:15:31 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

In EnergyPlus, WindowMaterial: Glazing module has three parts to input Glass spectral and Incident Angle transmittancee, front reflectance, and back reflectance. Though, I cannnot find out a table to define such values. Does anyone know how to define and input values?

answered 2021-09-30 03:23:35 -0600

Petros Dalavouras

499 ●13 ●7

You can use WINDOW from LBNL to model your windows and then export an .idf file with all the values you need both for average and spectral data

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Thank you for your comments. When exported from WINDOW, the bottom three cells in WindowMaterial: Glazing are blank. This means WINDOW exported data has no information for the three cells. I am wondering to define these three cells.

it ( 2021-09-30 04:07:49 -0600 )edit

I'm sorry I didn't grasp your question at first. So you need to use Optical Data Type = SpectralAndAngle. In this case I'm afraid that I can only point you at the example file "SpectralAngularOpticalProperties_TableData" which in the description says: "This file does the basic test of window properties as a function of wavelength and incident angle based on Winklemann approach. Table data are used to input optical properties. Linear interpolation is performed to calculate optical properties with a given incident angle." My take from this is that you should probably calculate the angular

Petros Dalavouras ( 2021-09-30 11:22:35 -0600 )edit

properties of the spectral data you obtained from WINDOW so as to create the table. In the Engineering Reference you can find this method of calculation.

Petros Dalavouras ( 2021-09-30 11:27:35 -0600 )edit

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