[Trace-users] nominal ventilation for heating and cooling

[Hayssam Barhoun]

Oscar, 

Is your question related to your baseline model or your proposed model? 

This may be related to your use of ASHRAE 62.1 methodology in Trace. 
Look into the room under the air flow tab, check the value for the heating zone air distribution effectiveness. If you have different values between the cooling and heating modes, your zone outdoor air flow will be corrected by the zone air distribution effectiveness.

Check also your system ventilation flag (under create systems - advanced) to see if your summing up the room OA requirements or you are applying ASHRAE 62.1 system level correction.
Hope this helps

Hayssam Barhoun PEng, LEED AP, PhD, BEMP
Senior Engineer | Mechanical
Arup
2 Bloor Street East, Suite 2400  Toronto  Ontario  M4W 1A8 Canada 
t +1 416 515 0915 x24427  d +1 647 260 3427  
www.arup.com


-----Original Message-----
From: Trace-users [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Oscar Buchely L.
Sent: Wednesday, May 21, 2014 1:45 PM
To: trace-users at lists.onebuilding.org
Subject: [Trace-users] nominal ventilation for heating and cooling

Hello.

We are modelling residential building for LEED purposes. In room check sum reports AIRFLOW section, Nom Vent cfm are different for cooling and heating. We already checked that cfm and schedule are the same for heating and cooling in CREATE ROOM airflow  tab, ventilation section.

Does anyone know why even though we have the same cfm and schedule?

Thanks.

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