[Equest-users] Fixing unmet hours / outside of throttling range warnings

[John Aulbach]

Mark:

Either spread your thermostat throttling range, or incrase your total supply 
airflow.

John R. Aulbach, PE, CEM
Senior Energy Engineer

________________________________

PartnerEnergy
1990 E. Grand Avenue, El Segundo, CA 90245
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
www.ptrenergy.com| jaulbach at ptrenergy.com
 




________________________________
From: Mark Darrall <MDarrall at a2so4.com>
To: equest-users <equest-users at lists.onebuilding.org>
Sent: Mon, May 2, 2011 6:21:24 AM
Subject: [Equest-users] Fixing unmet hours / outside of throttling range 
warnings


Good Morning, eQUESTers,
 
I’m working on my design case model. Here’s my ATTN report:
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys1 (PSZ) (G.NNW1)          may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys2 (PSZ) (G.WSW2)          may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys3 (PSZ) (G.N3)            may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys4 (PSZ) (G.S4)            may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys5 (PSZ) (G.N5)            may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys6 (PSZ) (G.E6)            may have inadequate cooling 
capability
             Check COOLING-CAPACITY and MIN-SUPPLY-T for consistency
 
**WARNING**********************************************************************
             SYSTEM EL1 Sys7 (PSZ) (G.C7)            has zero outside air for 
design calculations
 
 
This last one I can answer as this system is a R/A only computer room cooler. 
For the others:
 
COOLING-CAPACITY comes directly from the HVAC designer and is the capacity of 
the installed units. I’ve tried adjusting MIN-SUPPLY-T from 55 to 50 (and this 
seems to jive with information the coil manufacturer provides) to get a larger 
delta-T and it only seemed to make things worse somehow. Minimum OSA is 20%, but 
again, this is a design condition. These units do have enthalpy-controlled 
economizers.
 
I’m also getting WAY too many hours outside of throttling range – 15%. My 
baseline model only has a 3%. I’m way out of whack with Appendix G requirements.
 
Any suggestions as to settings to modify to clear these? Thank you!
 
MARK DARRALL, AIA, LEED AP BD+C, NCARB
Senior Project Manager
 
 
DESIGN ENRICHING LIFE // LIFE ENRICHING DESIGN
 
A2SO4 Architecture, LLC
Union Station
300 South Meridian Street / 250
Indianapolis, Indiana 46225
TEL  317 388 8850
FAX  317 280 0692
MOB 765 749 0841
www.a2so4.com
 
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