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[EnergyPlus_Support] purchase air with outside air

I have specified a flow rate for say 0.027 m3/s of outside air to be mixed
with some of the return air from my conditioned zone.  What I am wondering
is how the purchased air option will controll this.

1.  Will the purchased air component continually bring in 0.027 m3/s of
outside air irregardless if the purchased air component is needed to
condition the zone.  Therefor, the annual amount of energy to condition the
inflow of outside air to the setpoint temperature condition is essentially
just added onto the annual amount of energy necessary to condition the zone
when no outside air was specified.


2.  Based on the heating and cooling inlet temperatures into the zone
specified in the purchased air feature, for a given load in the zone, the
purchased air component will determine the "exact needed flow rate" of air
to condition that zone load.    Then based upon the flow rate, the purchase
air component will determine the energy to condition the 0.027 m3/s of
outside air and the return flow rate ("exact needed flow rate" - 0.027 m3/s)
to the inlet zone temperatures. This way the outside air is only brought in
when there is a zone load and the purchased air component needs to condition

Which process happens and do I need to specify an "exhaust node" in my
CONTROLLED ZONE EQUIP CONFIGURATION so that air in the zone can be released
to make room for the incoming outside air.

Thanks in advance
Ian Doebber

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