[EnergyPlus_Support] Mechanical Rooms

["josh_miarch" <jeemang@xxxxxxxxx>]

Howdy All;

I'm preparing a model for a LEED Canada EAc1 submission third party
review, and I'm curious as to how I should account for the building's
two mechanical rooms (this is the first LEED submission I've done). In
this building, they are both within the building envelope, and neither
is directly conditioned.

The literature says that if they're inside the main building envelope,
they should be modeled, but doesn't provide much guidance beyond that.
My thought, based on this, was that I should keep them uncontrolled
and add some internal gains objects to account for the heat given off
by the AHUs, pumps, boilers, etc, but I haven't the first clue about
how I could accurately estimate the heat emitted by this equipment,
particularly when it would be changing in response to the loads in
other parts of the building and the ambient temperature in the room. 

Alternatively, it was suggested to me that I add a single-zone system
of some sort (UNIT HEATER perhaps; the building isn't cooled) to
control it to a relaxed setpoint (16-18 C), which makes some amount of
sense to me, as it would avoid the problem of having to create a very
elaborate internal gains schedule. However, the problem I see (and
perhaps I'm misunderstanding  something) is that this would
effectively double count the inefficiencies of the equipment in the
mechanical room. 

Any suggestions on either method (or another) would be greatly
appreciated. 

Many thanks,

Josh



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