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# E+ Output:Variable - Single VAV Power Consumption

Dear all,

In E+ 9.2.0, I'm wondering if I can output the power consumption of a single VAV box in a specific zone? I want to read this value into my python code at each timestep. So it will be great if I can output this value as a variable. I know we can output its power consumption as a subcategory of meter data. But, I assume this kind of meter data cannot be read at each timestep...

Any comments or suggestions will be very much appreciated.

Best,

Yapan

OtherEquipment,
3ndFloor:Zone4 Equipment 1,  !- Name
Electricity,             !- Fuel Type
3ndFloor:Zone4,          !- Zone or ZoneList Name
Office_OpenOff_Equip,    !- Schedule Name
Watts/Area,              !- Design Level Calculation Method
,                        !- Design Level {W}
7.25,                    !- Power per Zone Floor Area {W/m2}
,                        !- Power per Person {W/person}
0,                       !- Fraction Latent
0,                       !- Fraction Lost
0,                       !- Carbon Dioxide Generation Rate {m3/s-W}
ELECTRIC EQUIPMENT#3ndFloor:Zone4#05;  !- End-Use Subcategory

AirTerminal:SingleDuct:VAV:Reheat,
3ndFloor:Zone4 Single Duct VAV Reheat,  !- Name
On 24/7,                 !- Availability Schedule Name
3ndFloor:Zone4 Single Duct VAV Reheat Damper Outlet,  !- Damper Air Outlet Node Name
Air Loop Zone Splitter Outlet Node 2,  !- Air Inlet Node Name
0.268,                   !- Maximum Air Flow Rate {m3/s}
Constant,                !- Zone Minimum Air Flow Input Method
0.3,                     !- Constant Minimum Air Flow Fraction
,                        !- Fixed Minimum Air Flow Rate {m3/s}
Min supply air flow fraction schedule: Always 0.3,  !- Minimum Air Flow Fraction Schedule Name
Coil:Heating:Water,      !- Reheat Coil Object Type
3ndFloor:Zone4 Single Duct VAV Reheat Heating Coil,  !- Reheat Coil Name
autosize,                !- Maximum Hot Water or Steam Flow Rate {m3/s}
0,                       !- Minimum Hot Water or Steam Flow Rate {m3/s}
3ndFloor:Zone4 Single Duct VAV Reheat Supply Inlet,  !- Air Outlet Node Name
0.001,                   !- Convergence Tolerance
Normal,                  !- Damper Heating Action
,                        !- Maximum Flow per Zone Floor Area During Reheat {m3/s-m2}
,                        !- Maximum Flow Fraction During Reheat
35;                      !- Maximum Reheat Air Temperature {C}

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This issue was solved by adding the following code to the idf file. Thank you for your time.

Output:Variable,
3ndFloor:Zone4,          !- Key Value
Zone Air System Sensible Heating Rate,  !- Variable Name
timestep;                !- Reporting Frequency

more

To be clear, you asked for the HVAC power consumption associated with the thermal zone, while the variable above is the heating energy transferred. That may be fine for your use case, but they are not the same thing.

( 2020-05-13 11:08:01 -0600 )edit

Thank you for clarifying this.

Can I calculate the HVAC power consumption based on the heating energy transferred? If I can reduce the heating energy transferred here, then I can reduce HVAC power consumption associated with it, right?

Thank you again.

( 2020-05-13 11:13:43 -0600 )edit