Dear Brent and Linda,
I was not sure I believed you at first….
Since you have some credibility, however, from past advice
;), I looked further into OtherEquipment and tried it out.
Guess what? It works as you say! Compliments of the
extra effort, it’s more apparent now because the object doesn’t
even ask you what type of energy (i.e., electricity, natural gas, etc.).
It just plunks whatever amount you specify in the middle of a zone.
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!
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 Griffith, Brent
Sent: Tuesday, September 07, 2010 6:38 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Simple way to account for motor casing
heat
The 20kW of
OtherEquipment doesn’t add to the electricity consumption meter, it just
adds heat load to the zone. This is to replace the 20kW of heat
“lost” by the pumps -- heat that originally came from electricity
used by the pumps. ElectricEquipment would add 20kW to the electricity
meter thus double counting the 20kW of electricity.
A few types of
equipment, like water heaters, already do add their skin losses to zone.
The wish list does include getting all types of equipment inefficiencies
coupled to zone loads.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of James V Dirkes
II, PE
Sent: Tuesday, September 07, 2010 4:24 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Simple way to account for motor casing
heat
Dear Brent,
I’m
missing something…..
If the energy is
already accounted for in, say, the pump object,
How can it be
that adding an OtherEquipment object with 20kW doesn’t double count?
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 Griffith, Brent
Sent: Tuesday, September 07, 2010 5:56 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Simple way to account for motor casing
heat
OtherEquipment
is less hassle than ElecticEquipment, it does not consume energy that would
need to be backed out to avoid double counting.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jvd2pe
Sent: Tuesday, September 07, 2010 3:12 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Simple way to account for motor casing heat
Dear Forum,
Life is good! Big problems are (mostly) solved, so I'm turning my attention to
smaller ones.
Has anyone come up with a simple way to add motor casing heat to a zone so that
the HVAC system treats it as a heating / coolning load?
For example:
* I have 200kW of pump motors in a mechanical room
* Each motor is 90% efficient
* This means that 20kW (10%) is lost from the motor to the adjoining mechanical
room zone
* the entire 220kW will be accounted for by E+ in its energy calculations, but
the HVAC system in the mechanical room never "sees" the 20kW and
therefore cannot respond properly.
My best solution thus far is to add the 20kW into the zone as
"OtherEquipment" or "ElectricEquipment", and then back it
out from the electricity totals (so it won't be counted twice).
That's too much effort for a relatively small amount of energy in my opinion!
Better idea, anyone? (Thanks in advance.)
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