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Re: [EnergyPlus_Support] Design Loads and Actual Loads

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Design Loads and Actual Loads
From: Ruchi Choudhary <ruch@xxxxxxxxx>
Date: Wed, 18 Jun 2003 18:19:37 -0400 (EDT)
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I am comparing the zone/sys heating and cooling rates output in the eso
file.

The sizing parameters are not many....for each zone I am specifying the
supply temperature, outside airflow per person and design humidity. Any
clue as to what could be the problem??

ruchi.


On Wed, 18 Jun 2003, Michael J. Witte wrote:

> Ruchi:
>
> No, this is not typical.  This means that something is inconsistent
> between your sizing parameters and your system description.  What
> exact variable are you comparing against the .zsz values?
>
> Mike
>
>
> On 18 Jun 2003, at 14:50, Ruchi Choudhary wrote:
>
> >
> > Hi Mike,
> >
> > Is it typical for the peak design loads reported in the zone sizing
> > file to not match the peak from the heating and cooling rates? I have
> > the same day and design day schedules and have not specified any
> > sizing parameter....In the case I am simulating, the peak design loads
> > in the *.zsz file are more than the heating and cooling rates for all
> > zones by a factor ranging from 1.2 to 6.0!
> >
> > ruchi.
> >
> >
> > On Tue, 13 May 2003, Michael J. Witte wrote:
> >
> > > Ruchi:
> > >
> > > To check the actual loads against the design loads, compare your
> > > peak zone/sys sensible heating and cooling rates from the simulation
> > > period against the reported peak heating and cooling loads in the
> > > eio sizing report.
> > >
> > > Mike
> > >
> > > On 9 May 2003, at 18:10, Ruchi Choudhary wrote:
> > >
> > > >
> > > >
> > > > Thanks very much Mike. Following up on your explaination: I
> > > > specified the flow/zone method in the zone sizing object and noted
> > > > resulting the peak heating and cooling capacity of the system.
> > > >
> > > > Then, I increased the interior
> > > > space gains in the zone without changing the specified amount of
> > > > air/zone. I expected the capacity of the system to remain the same
> > > > because now it should use the flow/zone to size the system
> > > > capacity. However the peak system capacity also changed.
> > > >
> > > > So it seems to me that the output in *ssz is based on loads
> > > > obtained from the design day simulation no matter what the airflow
> > > > method specification is. However both from what you say and the
> > > > text in the "Design Objects" section, it should not? Or is it that
> > > > the flow/zone is used for sizing components, but the system
> > > > capacity will always be sized on the basis of the design day
> > > > simulation? Following are my interpretations of the functional
> > > > dependencies:
> > > >
> > > > System Capacity=f(sys. supply temperature, total massflow rate,
> > > > total outside air)
> > > >
> > > > total mass flow rate=f(sum of mass flow rates of all zones)
> > > >
> > > > mass flow rate of a zone = f(zone supply temp., design load)
> > > >
> > > > Are any of this "mis"-interpretations? Also, it would be great if
> > > > you could tell me which of these get affected if I choose the
> > > > flow/zone method for specifying airflow.
> > > >
> > > > also, when I specify the air/zone, the *.eio file outputs both the
> > > > air/zone calculated on the basis of design day simulation as well
> > > > as the value computed on the basis of the design day simulation...
> > > >
> > > >
> > > > I also have another question :/
> > > >
> > > > How can I make sure that the actual energy use in the zone is
> > > > close enough to the design load (so the design load is not grossly
> > > > over-estimated)? Should I check the values of the heating/cooling
> > > > rate against the design load??
> > > >
> > > > thanks very much for your help!
> > > > ruchi.
> > > >
> > > >
> > > > On Fri, 9 May 2003, Michael J. Witte wrote:
> > > >
> > > > > If you specify a volumetric airflow rate in the zone sizing
> > > > > object, then this overrides the design load calculation for that
> > > > > zone.  The specified rate is then used when sizing the central
> > > > > air handling components (fan, coil, etc.)  This does not
> > > > > override the specified supply air temperature for sizing.
> > > > > Supply air volumes are sized to meet the sensible load in the
> > > > > zone based on the design day simulations.  For hourly details of
> > > > > these loads, see the *.zsz and *.ssz output files.
> > > > >
> > > > > Mike
> > > > >
> > > > >
> > > > >
> > > > > On 7 May 2003, at 14:32, Ruchi Choudhary wrote:
> > > > >
> > > > > >
> > > > > > Dear All,
> > > > > >
> > > > > > In the Zone Sizing Object there are two fields that allow the
> > > > > > user to either specify the volumetric airflow rate, or compute
> > > > > > it on the basis of the design day simulation.
> > > > > >
> > > > > > My understanding is that the mass flow rates computed by the
> > > > > > zone sizing object are used in conjunction with the system
> > > > > > supply temperature and outside air flow rate to compute the
> > > > > > system capacity.
> > > > > >
> > > > > > So if I specify the volumetric airflow rate for a zone, will
> > > > > > it be used to determine the system capacity rather than the
> > > > > > output from design day simulation? By doing so, I am
> > > > > > implicitly also over-riding the design load computed by the
> > > > > > zone-sizing object and zone supply air temperature
> > > > > > specification?
> > > > > >
> > > > > > Also, the *.eio file lists the design volumetric air flow
> > > > > > rates for each zone. I am assuming these are computed on the
> > > > > > basis of the design load and zone-sizing specs. (supply
> > > > > > temperature and humidity)?
> > > > > >
> > > > > > ruchi.
> > > > > >
> > > > > >
> > > > > >
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