Vacuum window internal and external surface temperatures fail to reflect insulation.

[HAHA11-FF]

Issue overview

A photovoltaic vacuum window was created in Energyplus but the simulated difference between its internal and external surface temperatures was not significant and failed to reflect the thermal insulation effect.

Here is my construction, please help me figure out why and correct it:

WindowMaterial:Gas,
Zkzk, !- Name
Custom, !- Gas Type
0.0002, !- Thickness {m}
0.0002, !- Conductivity Coefficient A {W/m-K}
0.0000776, !- Conductivity Coefficient B {W/m-K2}
0, !- Conductivity Coefficient C {W/m-K3}
0.000003723, !- Viscosity Coefficient A {kg/m-s}
0.0000000494, !- Viscosity Coefficient B {kg/m-s-K}
0, !- Viscosity Coefficient C {kg/m-s-K2}
1002.737, !- Specific Heat Coefficient A {J/kg-K}
0.012324, !- Specific Heat Coefficient B {J/kg-K2}
0, !- Specific Heat Coefficient C {J/kg-K3}
28.969999, !- Molecular Weight {g/mol}
1.4; !- Specific Heat Ratio

!- =========== ALL OBJECTS IN CLASS: WINDOWGAP:SUPPORTPILLAR ===========

WindowGap:SupportPillar,
supportpillar-16-gap-1, !- Name
0.3, !- Spacing {m}
0.0001; !- Radius {m}

!- =========== ALL OBJECTS IN CLASS: WINDOWMATERIAL:GAP ===========

WindowMaterial:Gap,
Gap_16_Layer, !- Name
0.0002, !- Thickness {m}
Zkzk, !- Gas (or Gas Mixture)
0.01, !- Pressure {Pa}
, !- Deflection State
supportpillar-16-gap-1; !- Support Pillar

Construction,
PVVG, !- Name
CdTe, !- Outside Layer
Gap_16_Layer, !- Layer 2
Clear 5mm; !- Layer 3