The outside boundary is adiabatic, no heat flow, so both sides have to be the same temperature…
Ned Lyon, P.E. (MA, WV)
Staff Consultant
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of qureshi.faran
Sent: Friday, August 09, 2013 9:35 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Why Inside and Outside face temperaures for a floor surface are same ?
I have a building model with its floor having one insulation layer. The details are given below. My question is that the energy plus simulation shows me exactly the same temperatures for the Inside and the Outside face of this
floor. I am expecting a difference due to insulation layer. How can this be explained ?
BuildingSurface:Detailed,
Zn001:Flr001, !- Name
Floor, !- Surface Type
Slab Floor with Radiant, !- Construction Name
ZONE ONE, !- Zone Name
Adiabatic, !- Outside Boundary Condition
, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
1.000000, !- View Factor to Ground
4, !- Number of Vertices
15.24000,0.000000,0.0, !- X,Y,Z ==> Vertex 1 {m}
0.000000,0.000000,0.0, !- X,Y,Z ==> Vertex 2 {m}
0.000000,15.24000,0.0, !- X,Y,Z ==> Vertex 3 {m}
15.24000,15.24000,0.0; !- X,Y,Z ==> Vertex 4 {m}
Material,
INS - EXPANDED EXT POLYSTYRENE R12 2 IN, !- Name
Rough, !- Roughness
5.0000001E-02, !- Thickness {m}
2.0000000E-02, !- Conductivity {W/m-K}
56.06000, !- Density {kg/m3}
1210.000, !- Specific Heat {J/kg-K}
0.9000000, !- Thermal Absorptance
0.5000000, !- Solar Absorptance
0.5000000; !- Visible Absorptance
Construction:InternalSource,
Slab Floor with Radiant, !- Name
4, !- Source Present After Layer Number
4, !- Temperature Calculation Requested After Layer Number
1, !- Dimensions for the CTF Calculation
0.1524, !- Tube Spacing {m}
CONCRETE - DRIED SAND AND GRAVEL 4 IN, !- Outside Layer
INS - EXPANDED EXT POLYSTYRENE R12 2 IN, !- Layer 2
GYP1, !- Layer 3
GYP2, !- Layer 4
FINISH FLOORING - TILE 1 / 16 IN; !- Layer 5
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