Re: [EnergyPlus_Support] Zone Level Airflows

["jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>]

Sizing:zone object you specify the air temperature and humidity with  
which the air should enter the zone (it doesn't matter where the air  
comes from or what amount of it is ODA). This air's energy (enthalpy  
and moisture) is added to the zones energy and moisture balance  
equations. In effect the volume airflow to meet the load at specified  
supply temp is calculated...sizing factor is included.

This is how the load is deturmined for the zone. The equipment is then  
sized (sizing:system object) to meet this load (air flow at specified  
temp). It may be specified that the equipment must supply a minimum  
ODA amount (and the equipment looks up this value from the sizing:zone  
object). If the value of the minimum ODA flowrate exceeds the total  
needed for cooling, the ODA rate will be used (100% ODA) and  
conditioned to the setpoints. The setpoint manager assigned air  
setpoint temps should be setup to deliver at least the air at the same  
setpoints as the design air setpoints that you put in the sizing:zone  
object.
>


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