[Equest-users] Heating Hours Unmet

[John Aulbach]

Kyle:

Your unmet hours are all in the morning warmup in the cooler months.

You might try COINCIDENT for Sizing-Option.

The SS-R unmet hours agree with the "Air Side" HVAC Summary Tab, when you click on the tree Diagram to the left on the Project name. Why the BEPS has a different number is unknown to me.

I believe others need to take a stab at this..so I reattach your eQuest files for their perusal.




SIZING-OPTION
Takes a code-word that specifies whether the system's 
SUPPLY-FLOW equals the sum of the zone flows (NON-COINCIDENT) or is based on the 
peak block load (COINCIDENT). The reason that NON-COINCIDENT is the default is 
due to the reduced lighting power and better window treatment that most 
designers use today. If the number of hours with "loads not met" is too high 
with SIZING-OPTION = NON-COINCIDENT, you should increase the air-side system 
capacity by setting SIZING-RATIO > 1.0. 
NON-COINCIDENT       SUPPLY-FLOW is sized using the sum of the 
peak loads of the individual zones. (These peaks usually occur at different 
times and are, therefore, non-coincident.)
COINCIDENT               SUPPLY-FLOW is sized using the peak 
value of the sum of the loads of the zones on the system.


--- On Mon, 9/14/09, Nisonger, Kyle M NWK <Kyle.M.Nisonger at usace.army.mil> wrote:

From: Nisonger, Kyle M NWK <Kyle.M.Nisonger at usace.army.mil>
Subject: Re: [Equest-users] Heating Hours Unmet
To: "Jeremy Poling" <jpoling at epsteinglobal.com>, equest-users at lists.onebuilding.org
Date: Monday, September 14, 2009, 8:42 AM

I have assigned each zone it's own single zone system, but I still am coming
up with about the same number of unmet hours.  I can manually adjust the
design cfm to lower them, but this seems futile trying to play around with it
to get it just right.  Shouldn't eQuest automatically size the equip. and
cfm's to meet the load?  Another question I have is why doesn't the percent
of hours outside of the throttling range on the BEPS report match up with the
number of unmet hours on the SS-R report?  I have attached my project files
if anyone has time to look at them.  I appreciate your help.

Thanks, 


Kyle Nisonger
Mechanical Engineer, LEED AP
US Army Corps of Engineers
Kansas City District
(816) 389-3224 

-----Original Message-----
From: Jeremy Poling [mailto:jpoling at epsteinglobal.com] 
Sent: Sunday, September 13, 2009 11:43 PM
To: Nisonger, Kyle M NWK; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Heating Hours Unmet

Kyle,

 

Try this first: eQuest expects a single-zone system to serve just that - a
single zone.  You'll need to have a separate single zone system created for
each zone you need to assign to that system.  Once that is done, eQuest will
then be able to address the thermostats in each zone adequately and you
should see a rather dramatic drop in your unmet heating hours, possibly
eliminating them altogether.

 

After that, if unmet heating hours remain there are a number of other things
to look at.  Let us know if the above works first.

 

JEREMY R. POLING, PE, LEED AP
Senior Sustainability Analyst
Strategic Services
Site Solutions | Operations | Sustainability

EPSTEIN

Epstein is a firm believer in sustainability. We ask that you please consider
the environment before printing this e-mail.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nisonger,
Kyle M NWK
Sent: Friday, September 11, 2009 4:11 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heating Hours Unmet

 

Equesters, 

I have a packaged single zone system using DX cooling and Furnace heating
that serves 7 different zones and is controlled by the corridor zone.  This
is supposed to replicate "System 3" in ASHRAE 90.1 appendix G.  I have many
unmet heating hours (including my system control zone).  I have let eQuest
auto size equipment capacities and and cfm. I have tried doing everything I
can think of to reduce the number of unmet hours.  My OA volumes are pretty
small and shouldn't be affecting it.  I expected possibly a few unmet hours
in some of the zones, but not in my control zone, the corridor, and not to
this magnitude.   I get the following warning message seen below, I'm not
sure what it means by "Baseboard-Rating"?  Any ideas on what this means or
how I could reduce the number of unmet heating hours?

 

 
**WARNING********************************************************************
** 
             ZONE EL1 Food Storage Zn (G.S2)      
             might have insufficient heating capability. 
             Check that the SYSTEM or ZONE HEATING-CAPACITY plus this 
             ZONEs BASEBOARD-RATING is adequate to maintain the ZONE 
             specified DESIGN-HEAT-T for the calculated peak ZONE load 
             (see LS-A or LS-B for the ZONE peak load.) 

 

Thanks for your help, 

Kyle Nisonger
Mechanical Engineer, LEED(r) AP
US Army Corps of Engineers
Kansas City District
(816) 389-3224 


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