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Insulation layer in idf file

asked 2019-12-02 18:35:23 -0600

updated 2019-12-03 09:31:47 -0600

Following is the Exterior Wall information in the IDF file, which layer is the insulation layer?

  Construction,
    Exterior Wall,           !- Name
    Stucco_1in,              !- Outside Layer
    Bldg_paper_felt,         !- Layer 2
    sheathing_consol_layer,  !- Layer 3
    OSB_5/8in,               !- Layer 4
    wall_consol_layer,       !- Layer 5
    Drywall_1/2in;           !- Layer 6

  Material:NoMass,
    Bldg_paper_felt,         !- Name
    Smooth,                  !- Roughness
    1.05666113069662E-02;    !- Thermal Resistance {m2-K/W}

  Material,
    sheathing_consol_layer,  !- Name
    Rough,                   !- Roughness
    0.0127,                  !- Thickness {m}
    0.0940184,               !- Conductivity {W/m-K}
    685.008,                 !- Density {kg/m3}
    1172.332;                !- Specific Heat {J/kg-K}


  Material,
    OSB_5/8in,               !- Name
    MediumSmooth,            !- Roughness
    0.015875032180756,       !- Thickness {m}
    0.1163,                  !- Conductivity {W/m-K}
    544.627399310259,        !- Density {kg/m3}
    1213.36000918149;        !- Specific Heat {J/kg-K}

  Material,
    wall_consol_layer,       !- Name
    Rough,                   !- Roughness
    0.1397,                  !- Thickness {m}
    0.05966275,              !- Conductivity {W/m-K}
    120.801,                 !- Density {kg/m3}
    1036.25775;              !- Specific Heat {J/kg-K}
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answered 2019-12-03 02:55:59 -0600

updated 2019-12-03 03:02:51 -0600

You just have to calculate the R-value of materials:

$$ R = \frac{e}{\lambda}$$

Where:

  • $R$: Thermal Resistance ($m^2 \cdot K \cdot W^{-1}$)
  • $e$: Thickness ($m$)
  • $\lambda$: Conductivity ($W \cdot m^{-1} \cdot K^{-1}$)

So your insulation layer is wall_consol_layer:

image description

It also has a low density, which is typical of insulation (since mostly it's the air trapped in the material that provides the insulaton...).

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Asked: 2019-12-02 18:35:23 -0600

Seen: 26 times

Last updated: Dec 03