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How to switch from FenestrationSurface:Detailed to using WindowMaterial:SimpleGlazingSystem

asked 2021-03-01 09:56:11 -0600

KerryHarp gravatar image

updated 2021-04-01 11:02:03 -0600

I have done EnergyPlus simulations using FenestrationSurface:Detailed, using glazing and frame data from LBNL WINDOW (bsdf files). I want to do a regression analysis by targeting U-factor and SHGC. So, I want to use the simple glazing system to enter the U and SHGC data.

I have tried to reference the exterior window construction in the detail surface (see code samples below). But this doesn't work. Can someone be of assistance with this? What am I missing here?

Glass,                   !- Name
1.817152,                !- U-Factor {W/m2-K}
0.4,                     !- Solar Heat Gain Coefficient

    !0.88;                    !- Visible Transmittance

Exterior Window,         !- Name
Glass;                   !- Outside Layer

Window_ldf1_1_Bot.unit1, !- Name
Window,                  !- Surface Type
Exterior Window,  !- Construction Name
Wall_ldf1_1.unit1,       !- Building Surface Name
,                        !- Outside Boundary Condition Object
,                        !- View Factor to Ground
,                         !- Frame and Divider Name
1,                       !- Multiplier
4,                       !- Number of Vertices
2.500000000000,0.000000000000,0.600000000000,  !- X,Y,Z ==> Vertex 1 {m}
3.823210000000,0.000000000000,0.600000000000,  !- X,Y,Z ==> Vertex 2 {m}
3.823210000000,0.000000000000,1.273210000000,  !- X,Y,Z ==> Vertex 3 {m}
2.500000000000,0.000000000000,1.273210000000;  !- X,Y,Z ==> Vertex 4 {m}

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answered 2021-03-01 10:47:26 -0600

Ammar De gravatar image

The only issue I see from the sample idf file you posted is the semi-colon ";" placement. If you want to include the visible transmittance value then it should look like this (without using "!" that comments out this part):

Glass,                   !- Name
1.817152,                !- U-Factor {W/m2-K}
0.4,                     !- Solar Heat Gain Coefficient
0.88;                    !- Visible Transmittance

If you don't want to consider the transmittance value, the TV should be commented using "!" and the semi colon ";" should be placed after the SHGC value (i.e., 0.4) to end the object as shown below:

   Glass,                   !- Name
   1.817152,                !- U-Factor {W/m2-K}
   0.4;                     !- Solar Heat Gain Coefficient
   ! 0.88;                    !- Visible Transmittance
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Good catch (head slap). I do not want VT in the regression analysis. I made the change but still had an error but it is related to the XYZ construction. I'm going to fix that first and make the changes to the fenestration.

KerryHarp gravatar image KerryHarp  ( 2021-03-01 11:14:26 -0600 )edit

answered 2021-03-01 13:16:29 -0600

KerryHarp gravatar image

Thank you Ammar for making the correction simple. Funny, I have been taking a data analytics bootcamp and we are working right now in sql. I should have recognized the need for the semicolon to end the command. ps: I ended up leaving the VT in the simple glazing system, defaulted it to the VT of dual, glazed uncoated window.

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Asked: 2021-03-01 09:56:11 -0600

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Last updated: Mar 01 '21