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

asked 2021-03-01 09:56:11 -0500

KerryHarp
133 ●3 ●5

updated 2021-04-01 11:02:03 -0500

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?

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

    !0.88;                    !- Visible Transmittance

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

FenestrationSurface:Detailed,
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 -0500

Ammar De

701 ●15 ●9

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):

WindowMaterial:SimpleGlazingSystem,
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:

  WindowMaterial:SimpleGlazingSystem,
   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 ( 2021-03-01 11:14:26 -0500 )edit

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answered 2021-03-01 13:16:29 -0500

KerryHarp
133 ●3 ●5

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.