[EnergyPlus_Support] HVAC BESTTEST

["dingwenting@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Hi,

I got the CE100.idf from others and it was the old version. I updated it to version 8.1 and ran it. but got  a severe error.

 

MATERIAL:Regular-R,
          INSULATION-EXT,   ! Material Name
          VerySmooth,   ! Roughness
        50.00       ,   ! Thermal Resistance {m2-K/W}
          0.9000    ,   ! Thermal Absorptance
          0.1000    ,   ! Solar Absorptance
          0.1000    ;   ! Visible Absorptance

 MATERIAL:Regular-R,
          INSULATION-INT,   ! Material Name
          VerySmooth,   ! Roughness
        50.00       ,   ! Thermal Resistance {m2-K/W}
          0.9000    ,   ! Thermal Absorptance
          0.6000    ,   ! Solar Absorptance
          0.6000    ;   ! Visible Absorptance

  CONSTRUCTION,
            LTWALL,     ! Construction Name
              ! Material layer names follow:
              INSULATION-EXT,
              INSULATION-INT;

 

The error message is

This building has no thermal mass which can cause an unstable solution.
   **   ~~~   ** Use Material object for all opaque material definitions except very light insulation layers.

 

In Case E100 the wall construction is conposed of only two insulation layers.

 

Who can give me some advice?

 

Thank you very much.

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Posted by: dingwenting@xxxxxxxxx

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