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Re: [EnergyPlus_Support] VAV Dual Duct

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] VAV Dual Duct
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Tue, 11 Feb 2003 14:55:18 -0600
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With autosizing, you still describe all of the components, but 
capacities and flow rates are calculated automatically.  For example, 
in DDAutoSize.idf, there are over 30 occurences of the word 
"autosize".  If you did not use autosizing, all of these inputs would 
require a valid capacity or flow rate number.  This is the advantage 
of using autosize.  

Currently, there is no output for volume flow rate, only mass flow 
rates.  To see the results of the autosizing calculations, look in 
the sizing reports in the eio output file.  This reports the design 
air flow rate for each zone, and all other autosized flow rates and 
capacities.

Reagarding zoning and zone equipment.  You must describe a unique air 
distribution object for each zone.  If you have seven zones served by 
DDVAV, then you need seven air distribution units and seven DDVAV 
terminal units.

Mike


On 8 Feb 2003, at 17:32, Ruchi Choudhary wrote:

> 
> Thanks a lot! I have also been looking at the DD-Autosize example. I
> changed the Dual-Duct from Const Volume to VAV in the Air Distribution
> Units object.
> 
> Apart from this--the main difference between autosize and the DDVAV
> file I see is where the zone, system and plant sizing objects are
> enabled.
> 
> I don't understand the implications of specifying the system
> fully as against autosize. Also, even in the Autosize example files,
> the system seems to be elaborately specified. So, what exactly would
> be the difference between using one against the other? Sorry if my
> question seems naive, but I have little experience with detailed HVAC
> specifications.
> 
> Regarding my earlier question of zone description: I am interested in
> getting (a) the total system capacity (heating and cooling energy) of
> the zone, (b) The total cfm for heating and cooling the zone (I don't
> see any output for cfm in the *.rdd file (c) Mean Air Temperature of
> each room in the zone (d) Surface Temperatures of specific walls in
> the zone.
> 
> I have described this one zone as 7 separate zones: each zone with a
> thermostatic control. However, all of them are served by the same AHU.
> I am not sure if I have modeled this correctly, and my question is
> whether this aspect is related to the Zone Equipment object: That I
> describe one Air Dribution Unit, and One zone eqipment and refer to
> that same equipment for all the zones in the "controlled zone equip
> configuration" object?
> 
> 
> Thanks for all your help,
> 
> 
> ruchi.
> 
> 
> On Fri, 7 Feb 2003, Michael J. Witte wrote:
> 
> > Ruchi:
> >
> > For an example of a dual duct VAV system, see
> >
> > EnergyPlus\ExampleFiles\Misc\DualDuctVarVolDamper.idf
> >
> > You may serve all of your zones with one or more DDVAV air handling
> > systems.  You need to evaluate which will give you the results you
> > need.
> >
> > Mike
> >
> >
> > On 4 Feb 2003, at 15:03, Ruchi Choudhary wrote:
> >
> > >
> > >
> > > Hi,
> > >
> > > I am trying to model a zone served by a Dual Duct VAV system:
> > > served by two AHUs with boilers and chillers for hot/cold water
> > > supply. My first question is if I there is a template file for the
> > > HVAC component that I can use as a "basefile".
> > >
> > > Second, Even though this is one zone, I have modeled/described
> > > each distinct functional area as a separate zone because I am
> > > interested in getting the mean air temperature for each of these
> > > areas. Now, I am not sure how I am supposed to model the HVAC
> > > system: one for all of these areas that I have described as
> > > separate zones, or a different one for each??
> > >
> > > Any help will be appreciated!
> > >
> > > Thanks,
> > >
> > > ruchi.
> > >
> > >
> > >
> > >
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References:
- Re: [EnergyPlus_Support] VAV Dual Duct
  - From: Michael J. Witte
- Re: [EnergyPlus_Support] VAV Dual Duct
  - From: Ruchi Choudhary

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