[BLDG-SIM] eQUEST Condensing Boiler Curve

[Peter Alspach]

Mark,
 
The best way to test custom curve fits is to use the boiler hourly
reports and check the efficiency/fuel consumption that is being
calculated against what you are expecting to see.
 
Regards,
 
Peter
 
Peter Alspach, P.E.
Associate
Arup
403 Columbia St., Suite 220
Seattle, WA 98104
T: 206-493-2226
C: 206-816-4902
F: 206-749-0665
E: peter.alspach at arup.com

________________________________

From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of Mark
Nieman
Sent: Thursday, December 21, 2006 9:42 AM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] eQUEST Condensing Boiler Curve



Using eQUEST v.3.6, I've taken a stab at creating a performance curve
for an Aerco KC1000 condensing boiler. I've defined BOILER:HIR-FT =
"Aerco-KC1000-HIR-fEWT&LWT" as shown below. This boiler is being used
for a water source heat pump condenser water loop with a CT/HX & two
condensing boilers, piped in a primary loop configuration.

"Aerco-KC1000-HIR-fEWT&LWT" = CURVE-FIT       
   TYPE             = BI-QUADRATIC-T 
   INPUT-TYPE       = DATA 
   INDEPENDENT-1    = ( 180, 180, 180, 80, 80, 80, 100, 100, 100, 120,
120, 
         120, 140, 140, 140, 160, 160, 160 ) 
   INDEPENDENT-2    = ( 180, 90, 135, 90, 135, 180, 90, 135, 180, 90,
135, 
         180, 90, 135, 180, 90, 135, 180 ) 
   DEPENDENT        = ( 1, 1.023, 1.019, 1.151, 1.077, 1.065, 1.102,
1.047, 
         1.038, 1.053, 1.026, 1.017, 1.033, 1.017, 1.012, 1.023, 1.017, 
         1.007 ) 
   .. 

Question: Is this a proper curve for this equipment? Any comments and
critiques would be much appreciated. Part of my difficulty is that
HIR-FT is a Bi-Quadratic-T or Bi-Linear-T curve that needs two
temperatures (EWT & LWT) to define the HIR ratio modifier. When looking
at the curves, it's stated as thermal efficiency vs. EWT (return water
temperature) on several different curves based on fire rate of the
boiler. Basically, I assumed a LWT based on firing rate (90F=25%,
135F=75% & 180F=100%). I'm not sure if this is reasonable or not. Per
the manual, the DEPENDENT variable is the ratio of the actual efficiency
(based on the curves) / rated efficiency (at full fire, full load).
INDEPENDENT-1 = EWT, INDEPENDENT-2 = LWT.

The link to the data sheet is here: 
http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344
<http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344>  

Mark Nieman, PE, CEM 
Sr. Energy Engineer 
McKinstry Essention 
Direct: (206) 832-8152 
Cell: (206) 510-4760 
FAX: (206) 832-8552 
http://www.mckinstry.com <http://www.mckinstry.com>  
"For The Life Of Your Building" 


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