How to implement Fan:SystemModel with Discrete speeds

asked 2024-11-28 18:30:14 -0600

updated 2024-12-01 16:37:54 -0600

EnergyPlus crashes when I try to add discrete speeds to the Fan:SystemModel. These are my inputs for the discrete fan speeds:

...
0.3832213238784,         !- Design Maximum Air Flow Rate {m3/s}
Discrete,                !- Speed Control Method
    0.783251231527094,       !- Electric Power Minimum Flow Rate Fraction
    250,                     !- Design Pressure Rise {Pa}
    0.9,                     !- Motor Efficiency
    1,                       !- Motor In Air Stream Fraction
    133.333333333333,        !- Design Electric Power Consumption {W}
    PowerPerFlow,            !- Design Power Sizing Method
    347.927750950626,        !- Electric Power Per Unit Flow Rate {W/(m3/s)}
    1.66667,                 !- Electric Power Per Unit Flow Rate Per Unit Pressure {W/((m3/s)-Pa)}
    0.7,                     !- Fan Total Efficiency
    Fan Curve,  !- Electric Power Function of Flow Fraction Curve Name
    ,                        !- Night Ventilation Mode Pressure Rise {Pa}
    ,                        !- Night Ventilation Mode Flow Fraction
    ,                        !- Motor Loss Zone Name
    0.5,                     !- Motor Loss Radiative Fraction
    General,                 !- End-Use Subcategory
    4,                       !- Number of Speeds
    0.78,                    !- Speed 1 Flow Fraction
    ,                        !- Speed 1 Electric Power Fraction
    0.87,                    !- Speed 2 Flow Fraction
    ,                        !- Speed 2 Electric Power Fraction
    0.96,                    !- Speed 3 Flow Fraction
    ,                        !- Speed 3 Electric Power Fraction
    1;                       !- Speed n Flow Fraction

This idf runs successfully without the discrete speeds set: https://www.dropbox.com/t/xVykG6F5PnP...

This idf crashes: https://www.dropbox.com/t/mZ59GtQHkCV...

What am I doing wrong?

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Comments

EnergyPlus should never crash. You should file a bug report at https://github.com/NREL/EnergyPlus/is... and link to this post.

shorowit's avatar shorowit  ( 2024-12-02 12:52:45 -0600 )edit