Auxiliary Energy Field

andrelopes · Posts: 17

Hello DB Team

I would like to know how to fill correctly the
"Auxiliary Energy Field" (DB v1.2).

I should insert the energy(kWh) per square meter per year:

For the whole Building (at Building Level)?

For each zone?

In the manual it says that the simulation for this field is modelled 24/7? What does it mean?

For instance, if I use the total power of ventilation and multiply for the same n.º hours/year that the lighting works, I have kWH, then I divide this by the building area. The result is 19,47 kWh/m2/year.

If I insert that value in Auxiliary Energy at Building Level, the simulation output results show a result of 0,39 kWh/m2/year.

I don´t understand how this works?

Regards

A L

Laurent_Support · Posts: 275 Location: Vincennes

hello,

You're right. This data is in kWh/m2/year and is seized at building level for inheritance or zone if you need specific value.

The consumption is presumed to be the same (constant) 24h/24 and 7d/7.

In your simulation DesignBuilder will display this data as: value_entered / 365 * m2.

Laurent

andrelopes · Posts: 17

Hello

Thank you for your answer, but I still have some doubts.

You said:
In your simulation DesignBuilder will display this data as: value_entered / 365 * m2.

Please confirm if this formula is correct:
value entered / (365*Building Area[m2])?

When I generate the correspondant IDF File, where Energy Plus inserts the Auxiliary Energy value ?

Regards

A L

Laurent_Support · Posts: 275 Location: Vincennes

Sorry, I insist but may is it clearer like this: value_displayed = (value_entered [kWh/m2 for a year] / 365 ) * m2.

This is a daily or hourly constant average value.

I don't think auxiliary energy is passed to E+. in simple HVAC simulation, E+ does not model any system so does not know what auxiliaries consume.
In this case, auxiliary energy is treated at DesignBuilder level only (simple HVAC simulation).

Laurent

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