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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
> >
> >The group web site is:
> >http://groups.yahoo.com/group/EnergyPlus_Support/
> >
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> >
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> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> The primary EnergyPlus web site is found at:
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
The primary EnergyPlus web site is found at:
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