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RE: [EnergyPlus_Support] 100% Outside
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?
>
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