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Re: [EnergyPlus_Support] 100% Outside
There's the Ventilation object. It includes fan energy consumption
Fred
Edward Lyon wrote:
>back to the jms_dtz issue
>
>So the system could be modeled using infiltration to provide the 100%
>outside air to the individual zones based on the occupancy schedule, but
>if you wanted the fan energy as well you would have to create a dummy
>zone with a primary air volume equal to and operating when the
>ventilation infiltration is active for the rest of the building....
>
>Ned
>
>________________________________
>
>From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
>Sent: Thursday, February 10, 2005 3:43 PM
>To: EnergyPlus_Support@xxxxxxxxxxxxxxx
>Subject: RE: [EnergyPlus_Support] 100% Outside
>
>
>The limitation in the current software is that there can only be one
>return
>node per zone. So, a zone can be served by multiple systems, but only
>one of
>those systems can be an air loop with a return path. The other
>system(s) must
>be zone equipment (not on an AIR PRIMARY LOOP) which uses supply and
>exhaust
>nodes. The reason for this is that the current structure does not have
>adequate information to determine how to divide the total return flow
>from a
>zone among multiple return air nodes.
>
>Mike
>
>
>On 8 Feb 2005, at 16:14, Edward Lyon wrote:
>
>
>
>>So if the structure of the program wants a return, why not provide one
>>
>>
>for your
>
>
>>outside airflow study? The return can go to a mixing box set for 100%
>>
>>
>exhaust.
>
>
>>I don't think you have to have an energy penalty for the return duct
>>
>>
>flow.
>
>
>>In the distant future when COMIS and mechanical systems can be
>>
>>
>combined, it
>
>
>>might be nice to just supply air to a space and have it return/exhaust
>>
>>
>where it
>
>
>>finds a place. I think the bigger problem that should have more
>>
>>
>development
>
>
>>attention now is modeling a common mechanical system design with
>>
>>
>several
>
>
>>supplies to different spaces (zones), but only one common return point
>>
>>
>(zone).
>
>
>>This is a typical small house or apartment system where supply from
>>
>>
>one zone
>
>
>>must flow through a second (third or fourth sometimes) zone to get to
>>
>>
>the
>
>
>>return. Mixing and cross mixing doesn't really do the job to simulate
>>
>>
>this
>
>
>>design. We might have more efficient small house designs if we could
>>
>>
>study this
>
>
>>system to determine better zone flow balances or thermostat
>>
>>
>placement....
>
>
>>Ned Lyon, Senior Project Manager
>>
>>Simpson Gumpertz & Heger Inc.
>>41 Seyon Street, Bldg 1 Suite 500
>>Waltham, Massachusetts 02453
>>
>>781-907-9350
>>
>>________________________________
>>
>>From: fred buhl [mailto:wfbuhl@xxxxxxx]
>>Sent: Tue 2/8/2005 1:56 PM
>>To: EnergyPlus_Support@xxxxxxxxxxxxxxx
>>Subject: Re: [EnergyPlus_Support] 100% Outside
>>
>>
>>I'm pretty sure this doesn't work right now - although it should. I
>>tried it fairly recently
>>and was unsuccessful. You may have to resort to zone equipment of some
>>
>>
>
>
>
>>sort. This is
>>a serious defficiency which we simply haven't had the time/people to
>>address.
>>
>>Fred Buhl
>>
>>jms_dtz wrote:
>>
>>
>>
>>>Has anyone modeled a 100% outside air system? I'm trying to provide
>>>assisted ventilation to a vav system based on occupancy. I've set it
>>>
>>>
>
>
>
>>>up to use direct air to the zones off a second air loop, but I want
>>>to supply outside air without a zone return, and I'm having trouble
>>>setting up the nodes. Any ideas?
>>>
>>>
>>>
>>>
>>>
>>>The primary EnergyPlus web site is found at:
>>>http://www.energyplus.gov
>>>
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>>>http://groups.yahoo.com/group/EnergyPlus_Support/
>>>
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>>>
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>
>
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>>>
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>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>========================================================
>Michael J. Witte, GARD Analytics, Inc.
>EnergyPlus Testing and Support
>EnergyPlus-Support@xxxxxxxx
>
>
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