[Equest-users] QRE: Keyword Expression question - set boiler type

Wed Apr 18 14:35:40 PDT 2018

Of course, you can take the long way around but you are limited to the command line version of DOE2.2:
##IF #[ BLR-EFF[] gt 0.89 ]
"Boiler-Offices" = BOILER
   TYPE             = HW-CONDENSING
   HEAT-INPUT-RATIO = {1 / #PA("HTG-EFF-BLR")}
   HIR-FPLR         = "CondBlr-HIR-fPLR&HWR"
   HW-LOOP          = "Baseboard-Loop"
   HW-PUMP          = "DEFAULT-HW-PUMP"
   HW-HEAD          = 0.01
   HW-STATIC-HEAD   = 0
   ..
##ELSE
"Boiler-Offices" = BOILER
   TYPE             = HW-BOILER
   HEAT-INPUT-RATIO = {1 / #PA("HTG-EFF-BLR")}
   HIR-FPLR         = "Atmospheric-Blr-HIR-fPLR"
   HW-LOOP          = "Baseboard-Loop"
   HW-PUMP          = "DEFAULT-HW-PUMP"
   HW-HEAD          = 0.01
   HW-STATIC-HEAD   = 0
   ..
##ENDIF

You have to define a macro variable:
##SET1 BLR-EFF 0.90 ..
Above somewhere.

You can do this in eQuest – by editing the .inp file then opening the eQuest project but eQuest immediately expands all macro expressions and strips them out of the .inp file.

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D3D73B.A9A288C0]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada

wsp.com

Please consider the environment before printing...

From: Nicholas Caton [mailto:Nicholas.Caton at schneider-electric.com]
Sent: Wednesday, April 18, 2018 5:16 PM
To: Jones, Christopher <Christopher.r.Jones at wsp.com>
Cc: equest-users at onebuilding.org
Subject: RE: Keyword Expression question - set boiler type

I think boiler / chiller TYPE, like airside system TYPE, is something you can technically “expressionize” via the eQuest interface, but you’ll find cirtical issues in simulation.

For primary equipment on hydronic loops, I much prefer to define for example

  *   +1 “dummy” primary loop, of an appropriate type (hot water in this case).  Give that a minor process load to avoid throwing errors in simulation
  *   Fully define your HW-BOILER and your “other” boiler(s) as distinct boilers in the same model, but place them on the “dummy” loop if they shouldn’t be active.
  *   With parametric run inputs, or with expressions, you can then “swap” which boiler(s) are on your actual primary loop by swapping the loop assignments.

Another working approach I’ve heard of is to define all boiler options of interest on the same (actual) loop, but use expressions to toggle capacity down to zero (or near zero) vs. actual sizing, to effectively turn ON only the boilers that should be active.  A little less work compared to a “dummy” loop approach, but doesn’t afford the same “spatial” sense of what boilers are active for a  given run.

~Nick

[cid:image002.png at 01D3D73B.A9A288C0]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
M  785.410.3317
F  913.564.6380
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image003.png at 01D3D73B.A9A288C0]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher via Equest-users
Sent: Wednesday, April 18, 2018 4:27 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Keyword Expression question - set boiler type

I am struggling to determine how to set a BOILER TYPE using a keyword expression.

If( x>Y) then
                TYPE = HW-BOILER
Endif

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D3D73B.A9A288C0]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com

Please consider the environment before printing...

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