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RE: [EnergyPlus_Support] optics data
Using WINDOW5 is a very effective way to enter window data into EnergyPlus.
If you choose not to use WINDOW5, here are answers to your other questions . . .
1. Only one WindowGlassSpectralData object can be associated with a given
MATERIAL:WINDOWGLASS layer. WindowGlassSpectralData allows for entry of up to
450 sets of "wavelength, transmittance, front reflectance, back reflectance".
When you say the optics program is producing 3 sets of data, how are these sets
different? If they are for different ranges of wavelength, then all 3 sets
would provide values to be part of a single WindowGlassSpectralData object.
2. EnergyPlus calculates the angular transmittance (and reflectance and
absorptance) of all window materials.
For layers of type SpectralAverage, this calculation is done once per timestep
using the single set of SpectralAverage properties.
For layers of type Spectral, this calculation is done once per timestep for
each set of wavelenght data provided in the WindowGlassSpectralData object.
Then the wavelength-based transmittances are combined into an overall
wavelength-weighted average transmittance for the heat balance calculations.
Mike
On 27 Nov 2005, at 14:31, Mahabir Bhandari wrote:
> Ozgur,
>
> If you do not want to manually enter the data, you can first import Optics
> data to WINDOW5 and then create E+ report. You can find the instructions for
> importing Optics Data to WINDOW5 at the following link under the heading -
> Import Glass Layers from Optics5 User Database:
>
> http://windows.lbl.gov/software/window/52/W52_faq.html#ImportingGlassLayers
>
> WINDOW5 E+ report will take care of angle dependent transmittance as well.
>
> I hope it helps.
>
> Mahabir Bhandari
>
> -----Original Message-----
> From: ogocer@xxxxxxxxxxxxxx [mailto:ogocer@xxxxxxxxxxxxxx]
> Sent: Sunday, November 27, 2005 11:58 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] optics data
>
> Dear all,
> i want to learn how can i transfer optics data to idf file? Have to i
> enter all optics data manually?
> and when i select spectral choice in window construction, i have to define
> name of spectral data. optics program gives three different datas so if i
> have to enter these datas as windowglassspectraldata, which data will i
> define in "name of spectral data".
> the other question is i can't understand the relation between spectral
> behaviour of glass and angular dependent characteristics of glass? in help
> manual it is said "energyplus first calculates transmittance and
> absorbtance vs. angle of incidence for each wavelength." is it means
> energyplus also calculates angular dependence transmittace vs. without
> defining spectral data but not for each wavelength.
> as you see i am very confused and i need your help.
> thanks
> ozgur gocer
>
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press
> the "search" button.
>
> Yahoo! Groups Links
>
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>
>
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>
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>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
>
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>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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