Hi,
Like a number of persons before me, I am trying to understand the zone air energy balance. I have some trouble to understand the Zone Air Heat Balance Outdoor Air Transfer Rate output.
According to the documentation : "It is the sum, in watts, of heat transferred to the zone air from all the transfers of air from the out side, such as infiltration"
The output is 0 when no "Zone Airflow" objects are declared
When I add "ZoneInfiltration:DesignFlowrate" or "ZoneVentilation:DesignFlowRate" (or both), the output is not null.
I was expecting :
Zone Air Heat Balance Outdoor Air Transfer Rate = Infiltration Total Heat Gain - Infiltration Total Heat Loss + Ventilation Total Heat Gain - Ventilation Total Heat Loss
(With Infiltration and Ventialtion converted in the appropriate unit and timestep)
However, I get variable and sometime strong difference that I can't explain :
- I cannot relate it to anything (schedule, temperature, etc.)
- The mean difference is not null
- The relative difference seems to be smaller with large ventilation flowrate
Do you know what I am missing ?
Thank you !
