[Equest-users] Typical assumptions for Mechanical Room exhausts

Keith Swartz kswartz at ecw.org
Tue Dec 20 14:23:26 PST 2011


Ramana,

If the heat is simply for freeze protection, the mechanical room might qualify as a "semi-heated space" instead of a "conditioned space." (See the definitions under "space" in 90.1.) Then you would not have to model the cooling system.

On the other hand you might want to keep the cooling system in to enable the air-side economizer. If you want the mechanical room ventilation system to operate based on room temperature, you could model an air system with cooling in eQUEST and enter a high limit for the economizer so that the fan will come on to "economize" when the room temperature exceeds the setpoint. Be sure to lock out the compressor during economizer mode.

________________________________
Keith Swartz, P.E., LEED AP

Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
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Fax: 608.238.0523

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From: Ramana Koti [mailto:ramana.koti at gmail.com]
Sent: Tuesday, December 20, 2011 10:30 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Typical assumptions for Mechanical Room exhausts

Dear All,

Specifically for energy models for LEED EAc1, what are typical assumptions for operation of mechanical room exhaust? The mechanical rooms in a project I'm dealing with have freeze protection heating only but as per LEED spaces that are heating or cooling only have to be modeled as both heating and cooling. For example, one of the mechanical rooms has 8000 CFM of exhaust and zero Outside Air CFM. How does one model for accurate representation yet keep the loads from ballooning disproportionately in such a situation?

Thanks,
Ramana Koti.
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