[Equest-users] OA-FROM-SYSTEM

Nick Caton ncaton at smithboucher.com
Tue Sep 25 11:37:51 PDT 2012

Hi Rodrigo,

As a general rule, do not feel compelled to use every input available.  It is perfectly normal for many inputs to not apply for a given project - what's appropriate is ultimately a decision the modeler has to make for his/her own model.  A balanced approach is to learn about/review and make a conscious decision to use or not use a specific inputs as they come up.

OA-FROM-SYSTEM specifically causes ventilation OA quantities for the child zones to be conditioned/dehumidified by another system.  Right-click that field and read the corresponding help entries for more information.  It is useful for specific system scenarios and approximations, but does not apply to every building.  Many discussions regarding OA-FROM-SYSTEM are available for further reading in the mailing list archives, if needed.

Hope that helps!

[cid:489575314 at 22072009-0ABB]


Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Rodrigo Cerqueira
Sent: Tuesday, September 25, 2012 12:46 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] OA-FROM-SYSTEM

Hi everyone,

When the outside air comes from the same system, I have to choose the system in OA-FROM-SYSTEM or I leave "undefined"?
This cause an enormous change in my space heat performances and I couldn't identify the reason.

Thank you

Rodrigo Cerqueira
Simulation énergétique

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