[EnergyPlus_Support] Re: design load output questions

["sm278424" <shaunmartin@xxxxxxx>]

Ahh, very helpful, thank you.

P317 of the I/O reference talks about the sizing issue - I had 
specified the Design Flow Rate for the air system, so the program 
calculates a sizing factor.  

Your answer leads to two more questions:

1.  In this case, can I assume that the loss to the back side of the 
radiant panel is:  (4161.89 + 8105.6) - 11587.44 = 680.05 ? This 
would be to a plenum, in this instance.

2.  Is there a way to get a handle on the peak latent load for the 
zone and the air system aside from 'Zone,Sum,Zone-Total Internal 
Latent Gain[J]'?

Thanks again

Shaun Martin



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
<mjwitte@g...> wrote:
> I am guessing that you have a zone which is served by both an air 
system and a 
> radiant hydronic system.
> 
> 1.  The sizing reported in the zsz file is before application of 
the sizing 
> factor, the eio sizing includes the sizing factor.  If this is no 
1.0 (in 
> either SIZING PARAMETERS or ZONE SIZING), then the values will not 
be the same.
> 
> 2.  No.  None of the values shown below include latent cooling, 
they are all 
> sensible loads.  Values a and b are simulation results, values c 
and d are 
> sizing results.  With radiant systems, unlike air systems, not all 
of the 
> cooling input to the slab will end up in the space.  Values c and d 
are zone 
> cooling requirements which are completely independent of the type 
of system 
> which will serve the zone.  Value a is the cooling energy input to 
the radiant 
> system, and some will be lost out the back side of the surface.
> 
> Mike
> 
> 
> On 20 Aug 2004, at 15:52, sm278424 wrote:
> 
> > Hi 
> > 
> > I wonder if someone can help me interpret some of the E+ output.  
I'm 
> > trying to do some design sizing.  From one run, I have:
> > 
> > 
> > a)  file.CSV - Z1 RADIANT PANEL:Hydronic Low Temp Radiant Cooling 
Rate
> > [W](Hourly) = 4161.89 W  (autosized)
> > 
> > b)  file.CSV - ZN1:E PERIM SPC:Zone/Sys Sensible Cooling Rate[W]
> > (Hourly) = 8105.6  (fixed 6 ACH)
> > 
> > c)  file.EIO - DesLoad {W}  Cooling = 10277.00 W
> > 
> > d)  file.ZSZ - ZN1:E PERIM SPC:VANC_INTL CLG .4% DB=>MWB:Des Cool 
> > Load [W] = 11587.44 W
> > 
> > 
> > my two questions are:
> > 
> > 1. should c and d be the same? or, why not?
> > 
> > 2. should (a + b + latent) = c or d?
> > 
> > Thanks
> > 
> > Shaun Martin
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 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@g...



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