Dear Linda,
The suggestion is a bit verbose, but it
may help:
(black text is the IO Reference current description, Red is my editing)
OtherEquipment, HotWaterEquipment, SteamEquipment
In addition to Electric and Gas equipment
types, Other (unspecified source), Hot Water and
Steam equipment types are available. One
notable feature of the OtherEquipment is that the
Design Level field can have negative (heat
loss) values. The definitions are the same as for
GasEquipment.
OtherEquipment energy affects the zone’s temperature and zone
heating / cooling loads, and therefore affects the operation and energy use of
the HVAC systems serving the zone. It does not add to any energy source. e.g.,
If you add 10kW of OtherEquipment energy to a zone, the total facility energy
use is not increased directly. Total facility energy use is affected
indirectly because the 10kW will offset heating loads and will increase cooling
loads.
One possible use of OtherEquipment is to add motor casing heat to a
zone in which the motor is located. The motor casing losses are accounted for
by Energy Plus in the fan or pump which the motor serves, but the casing losses
do not affect the zone. Adding the casing losses to the zone with OtherEquipment
will affect heating and cooling system operation appropriately, but will not
increase overall electricity use.
HotWaterEquipment works the same as OtherEquipment except …..
SteamEquipment works the same as OtherEquipment except …..
I have not used the Tips manual, so I took this occasion to make
a quick review. On the one hand, it seems that something about OtherEquipment
may be an appropriate addition. On the other hand, I suspect it’s a rare
energy modeler who even knows what happens to motor casing heat, let alone
cares … so I would not put it in the Tips manual for that reason alone.
You probably have a short list of other uses, though, for OtherEquipment and it
might be helpful to put those into Tips.
Now that I’ve had a few minutes to think about it, I
realize that I used OtherEquipment in a recent swimming pool model to add all
the evaporated water as a latent load to the pool HVAC; very handy!. It never
occurred to me at the time that the latent energy was “coming out of thin
air”, so to speak.
Thanks for asking and for all you and the E+ Team do for the
rest of us.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Linda Lawrie
Sent: Wednesday, September 08, 2010 1:49 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Simple way to account for motor casing
heat
At 11:43 AM 9/8/2010, James V Dirkes II, PE wrote:
It would be nice if this was better expressed in the IO Reference, but I now have a simple way to add motor casing heat to a zone. Thank you!
Any suggestions on how to do this are more than appreciated.
Would it have helped if it was in the Tips manual?
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