[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 18:51:53 -0400 (EDT)
Delivered-to: lawrie.com%linda@xxxxxxxxxx
Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
In-reply-to: <3EF0A165.28037.63ADAD58@localhost>
List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>
Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx
Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx

Thanks very much Mike. I have uploaded a file called SouthClinic.idf in
the yahoo support group file area.

ruchi.


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

> Please send me your input file.  Either send as a zipped attachment
> to energyplus-support@xxxxxxxx or upload it to the yahoo support
> group files area and send me a message when it's there.
>
> Mike
>
>
>
> On 18 Jun 2003, at 18:19, Ruchi Choudhary wrote:
>
> >
> > 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.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > ------------------------ Yahoo! Groups Sponsor
> > > > > > > > ---------------------~--> Rent DVDs Online - Over 14,500
> > > > > > > > titles. No Late Fees & Free Shipping. Try Netflix for
> > > > > > > > FREE!
> > > > > > > > http://us.click.yahoo.com/YoVfrB/XP.FAA/uetFAA/dkFolB/TM
> > > > > > > > ----------------------------------------------------------
> > > > > > > > ---- ---- ---~ ->
> > > > > > > >
> > > > > > > > To unsubscribe from this group, send an email to:
> > > > > > > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > > > > > > >
> > > > > > > > The primary EnergyPlus web site is found at:
> > > > > > > > http://www.energyplus.gov
> > > > > > > >
> > > > > > > > The group web site is:
> > > > > > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > > > > > >
> > > > > > > > Attachments are not allowed -- please post any files to
> > > > > > > > the appropriate folder in the Files are of the Support Web
> > > > > > > > Site.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Your use of Yahoo! Groups is subject to
> > > > > > > > http://docs.yahoo.com/info/terms/
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ========================================================
> > > > > > > EnergyPlus Testing and Support EnergyPlus-Support@xxxxxxxx
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > To unsubscribe from this group, send an email to:
> > > > > > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > > > > > >
> > > > > > > The primary EnergyPlus web site is found at:
> > > > > > > http://www.energyplus.gov
> > > > > > >
> > > > > > > The group web site is:
> > > > > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > > > > >
> > > > > > > Attachments are not allowed -- please post any files to the
> > > > > > > appropriate folder in the Files are of the Support Web Site.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Your use of Yahoo! Groups is subject to
> > > > > > > http://docs.yahoo.com/info/terms/
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > ------------------------ Yahoo! Groups Sponsor
> > > > > > ---------------------~--> Rent DVDs from home. Over 14,500
> > > > > > titles. Free Shipping & No Late Fees. Try Netflix for FREE!
> > > > > > http://us.click.yahoo.com/BVVfoB/hP.FAA/uetFAA/dkFolB/TM
> > > > > > --------------------------------------------------------------
> > > > > > ---- ---~ ->
> > > > > >
> > > > > > To unsubscribe from this group, send an email to:
> > > > > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > > > > >
> > > > > > The primary EnergyPlus web site is found at:
> > > > > > http://www.energyplus.gov
> > > > > >
> > > > > > The group web site is:
> > > > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > > > >
> > > > > > Attachments are not allowed -- please post any files to the
> > > > > > appropriate folder in the Files are of the Support Web Site.
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Your use of Yahoo! Groups is subject to
> > > > > > http://docs.yahoo.com/info/terms/
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > > ========================================================
> > > > > EnergyPlus Testing and Support
> > > > > EnergyPlus-Support@xxxxxxxx
> > > > >
> > > > >
> > > > >
> > > > > To unsubscribe from this group, send an email to:
> > > > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > > > >
> > > > > The primary EnergyPlus web site is found at:
> > > > > http://www.energyplus.gov
> > > > >
> > > > > The group web site is:
> > > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > > >
> > > > > Attachments are not allowed -- please post any files to the
> > > > > appropriate folder in the Files are of the Support Web Site.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > Your use of Yahoo! Groups is subject to
> > > > > http://docs.yahoo.com/info/terms/
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > > > ------------------------ Yahoo! Groups Sponsor
> > > > ---------------------~--> Looking for the latest Free IT White
> > > > Papers? Visit SearchMobileComputing.com to access over 500 white
> > > > papers. Get instant access at SearchMobileComputing.com Today
> > > > http://us.click.yahoo.com/ZyjvfD/PLNGAA/uitMAA/dkFolB/TM
> > > > ------------------------------------------------------------------
> > > > ---~ ->
> > > >
> > > > To unsubscribe from this group, send an email to:
> > > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > > >
> > > > The primary EnergyPlus web site is found at:
> > > > http://www.energyplus.gov
> > > >
> > > > The group web site is:
> > > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > >
> > > > Attachments are not allowed -- please post any files to the
> > > > appropriate folder in the Files are of the Support Web Site.
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Your use of Yahoo! Groups is subject to
> > > > http://docs.yahoo.com/info/terms/
> > > >
> > >
> > >
> > >
> > > ========================================================
> > > EnergyPlus Testing and Support
> > > EnergyPlus-Support@xxxxxxxx
> > >
> > >
> > >
> > > To unsubscribe from this group, send an email to:
> > > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> > >
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > >
> > > The group web site is:
> > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > >
> > > Attachments are not allowed -- please post any files to the
> > > appropriate folder in the Files are of the Support Web Site.
> > >
> > >
> > >
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> > > http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> >
> >
> > ------------------------ Yahoo! Groups Sponsor
> > ---------------------~--> Looking for the latest Free IT White Papers?
> > Visit SearchSecurity.com to access over 500 white papers. Get instant
> > access at SearchSecurity.com Today
> > http://us.click.yahoo.com/ayjvfD/QLNGAA/uitMAA/dkFolB/TM
> > ---------------------------------------------------------------------~
> > ->
> >
> > To unsubscribe from this group, send an email to:
> > EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are not allowed -- please post any files to the
> > appropriate folder in the Files are of the Support Web Site.
> >
> >
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
>
>
>
> ========================================================
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
> To unsubscribe from this group, send an email to:
> EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.
>
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>


------------------------ Yahoo! Groups Sponsor ---------------------~-->
Looking for the latest Free IT White Papers?
Visit SearchMobileComputing.com to access over 500 white papers.
Get instant access at SearchMobileComputing.com Today
http://us.click.yahoo.com/ZyjvfD/PLNGAA/uitMAA/dkFolB/TM
---------------------------------------------------------------------~->

To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
References:
- Re: [EnergyPlus_Support] Design Loads and Actual Loads
  - From: Michael J. Witte
Prev by Date: Re: [EnergyPlus_Support] Design Loads and Actual Loads
Next by Date: Re: [EnergyPlus_Support] Zone return air path
Previous by thread: Re: [EnergyPlus_Support] Design Loads and Actual Loads
Next by thread: Re: [EnergyPlus_Support] Design Loads and Actual Loads
Index(es):
- Date
- Thread