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Re: [EnergyPlus_Support] Flow rate
Sorry to ignore that detail. The SYSTEM SIZING object lets you specify whether
to size the system based on coincident or non-coincident peaks.
On 3 Jun 2004, at 16:07, Edward Lyon wrote:
> Mike,
>
> While I fully understand what you wrote, it does not correspond to
> typical design practice. The main branch is often smaller than max of
> the connected terminal units because it is assumes that some diversity
> exists, that is not all the terminal devices hit a max call at the same
> time. I assume that an autosize feature looks at the diversity for you,
> otherwise if autosize just sums the max terminal flows, it oversizes the
> main branch.
>
> Ned Lyon
>
> Senior Project Manager
> Simpson Gumpertz & Heger Inc.
>
> 41 Seyon Street
> Building #1, Suite 500
> Waltham, MA 02453
>
> Phone: 781-907-9000
> Fax: 781-907-9009
>
>
> >>> mjwitte@xxxxxxxx 6/3/2004 2:55:40 PM >>>
> The max flow rate in the air loop main branch is usually set to equal
> the sum
> of the max flow rates of the terminal units. In your case, if you air
> loop
> serves a single zone, then the max flow rate should equal the max
> damper air
> flow rate of 0.47 m3/s. The fan max flow rate should be the same. The
> fan min
> flow rate is set by the min flow rate of the terminal untis. This is
> all just
> continuity. Look at your system diagram and once you know the flow
> rates of
> the terminal units, then you can figure out the flow rates for the
> other
> components. Or you can use the sizing features to set these values for
> you.
>
> Mike
>
>
> On 2 Jun 2004, at 9:03, pizzaalan wrote:
>
> > Hi,
> >
> > I am not sure how to choose max flow rate for air loop main branch,
> > (1.3 m3/s in example), max plant loop volumetric flow rate (0.0011
> > m3/s in example), max damper air flow rate (0.47 m3/s).
> >
> > Also, I am not sure how to pick up pump ( pump head? rated
> > volumetric flow rate), Fan max & min flow rate?
> >
> > I will appreciate if anyone gives me a guide. Thanks.
> >
> > Alan
> >
> >
> >
> >
> > 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 area of the Support Web Site.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
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