[Trace-users] Ventilation Rate

Wilson, Luke LWilson at integral-group.net
Tue Apr 6 04:45:47 PDT 2010

Thanks to all for the replies. So to summarize: the system level ventilation rate should be the same in both cases, but Trace doesn't have a way to specify system level ventilation.

From: Craig Gann [mailto:cjg04austin at swbell.net]
Sent: Monday, April 05, 2010 4:48 PM
To: Wilson, Luke
Cc: Scott Parker; trace-users at lists.onebuilding.org
Subject: Re: [Trace-users] Ventilation Rate

To expand on the discussion..... minimum ventilation rates at the space (room) level are defined by ASHRAE 62, however the design quantity of ventilation air (cfm) introduced into the system must be the same for both proposed and baseline designs. How that ventilation air is controlled at off-peak conditions (such as with DCV, etc) is where the potential energy savings are for the proposed design. In other words both designs must introduce the same ventilation cfm at the design condition. The design ventilation quantity is to be calculated per the ASHRAE 62.1 version applicable to the particular LEED version you are using.


Craig J. Gann, P.E.; LEED AP

On 4/5/2010 3:27 PM, Wilson, Luke wrote:
Thanks for the reply.
So the minimum ventilation rates that Appendix G is referencing is on the space level and not on the system level?

From: Scott Parker [mailto:sparker at aeieng.com]
Sent: Monday, April 05, 2010 4:25 PM
To: Wilson, Luke
Subject: RE: Ventilation Rate

You will have the same outside air per person or per area rate in the templates when you create a new alternate based on the Alternative 1.  If your system type changes so that you have a more efficient introduction of outside air, and thereby reduce the total outside air required, then this is a legitimate savings.  However, you must have the same outside air rates per person or per area (e.g. in a lab if you have a minimum of 6 ACH, once-thru, then you cannot show savings for going down to 4 ACH in the proposed design - I think this is what 90.1 wants to avoid).


From: trace-users-bounces at lists.onebuilding.org<mailto:trace-users-bounces at lists.onebuilding.org> [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Wilson, Luke
Sent: Monday, April 05, 2010 4:03 PM
To: trace-users at lists.onebuilding.org<mailto:trace-users at lists.onebuilding.org>
Subject: [Trace-users] Ventilation Rate

For ASHRAE 90.1 Appendix G, it requires that the proposed and baseline ventilation rates be the same. I have my proposed ventilation rate. Is there a way to input a system level Ventilation rate in Trace?
Any help would be appreciated.

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