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.)
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe
__,_._,___