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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 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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