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[EnergyPlus_Support] Re: HeatPumpWaterToAirEquationFit Problem

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: HeatPumpWaterToAirEquationFit Problem
From: "tr1g92" <trig92@xxxxxxxxx>
Date: Tue, 12 Mar 2013 12:44:47 -0000
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Jean- As far as switching off all components, the documentation says
that if I change the Supply Air Fan Operating Mode Schedule from 1 to 0,
then the unit will cycle by shutting off both the fan and the coils.

Richard- The example file runs just fine with the cycling unit, the
problem arises when I attempt to autosize the air loop. That being said,
if I impliment the autosize into the air loop and turn the unit to
always on (1), it runs just fine. It is when the air loop is autosized
and attempting to cycle that the problem occurs.

I appreciate the help!

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad
<RRaustad@...> wrote:
>
> How does the example file respond when changing the Fan Operating Mode
> Schedule?
>
> On 3/12/2013 2:51 AM, Jean marais wrote:
> > The rule of thumb is that as long as you can't explain the error, it
remains a problem. Are you "switching off" all the associated componants
like fans as well?
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "tr1g92" trig92@ wrote:
> >>
> >> Hello All,
> >>
> >> I am working on a WSHP model. I started with the example file
> >> HeatPumpWaterToAirEquationFit.idf and have started to manipulate
the
> >> file to represent a boiler/tower system with the CoolReheat
> >> dehumidification cycle. I have gotten the file to perform the way I
> >> expect without any errors. However, when I change the WSHP Supply
Air
> >> Fan Operating Mode Schedule from a constant 1 to a constant 0
(which
> >> should represent unit cycling), I get the following errors:
> >>
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE1-1" did not converge after 25 warmup days.
> >> ** ~~~ ** See Warmup Convergence Information in .eio file for
> >> details.
> >> ** ~~~ ** ...Environment(SizingPeriod)="CHICAGO_IL_USA ANNUAL
> >> HEATING 99% DESIGN CONDITIONS DB"
> >> ** ~~~ ** ..Max Temp Comparison = 1.65 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 1.08E-003 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 1.0068 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 1.0000 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE2-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(SizingPeriod)="CHICAGO_IL_USA ANNUAL
> >> HEATING 99% DESIGN CONDITIONS DB"
> >> ** ~~~ ** ..Max Temp Comparison = 1.05 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 1.94E-004 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 2.4403 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 0.4412 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE3-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(SizingPeriod)="CHICAGO_IL_USA ANNUAL
> >> HEATING 99% DESIGN CONDITIONS DB"
> >> ** ~~~ ** ..Max Temp Comparison = 3.54 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 7.09E-004 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 6.1600E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 1.0000 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE4-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(SizingPeriod)="CHICAGO_IL_USA ANNUAL
> >> HEATING 99% DESIGN CONDITIONS DB"
> >> ** ~~~ ** ..Max Temp Comparison = 2.54 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 6.77E-004 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 3.9986E-003 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 0.6022 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE5-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(SizingPeriod)="CHICAGO_IL_USA ANNUAL
> >> HEATING 99% DESIGN CONDITIONS DB"
> >> ** ~~~ ** ..Max Temp Comparison = 9.19E-004 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 0.32 vs Temperature Convergence
> >> Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 1.0964E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 0.1821 vs Loads
> >> Convergence Tolerance=4.00E-002 - Fail Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE1-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(RunPeriod)="CHICAGO IL USA TMY2-94846
> >> WMO#=725300"
> >> ** ~~~ ** ..Max Temp Comparison = 0.63 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 4.68E-002 vs Temperature
> >> Convergence Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 1.8529E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 2.4692E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE2-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(RunPeriod)="CHICAGO IL USA TMY2-94846
> >> WMO#=725300"
> >> ** ~~~ ** ..Max Temp Comparison = 0.89 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 0.19 vs Temperature Convergence
> >> Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 1.5899E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 1.5204E-003 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** Severe ** CheckWarmupConvergence: Loads Initialization,
> >> Zone="SPACE4-1" did not converge after 25 warmup days.
> >> ** ~~~ ** ...Environment(RunPeriod)="CHICAGO IL USA TMY2-94846
> >> WMO#=725300"
> >> ** ~~~ ** ..Max Temp Comparison = 6.94 vs Temperature Convergence
> >> Tolerance=0.40 - Fail Convergence
> >> ** ~~~ ** ..Min Temp Comparison = 0.13 vs Temperature Convergence
> >> Tolerance=0.40 - Pass Convergence
> >> ** ~~~ ** ..Max Heat Load Comparison = 2.2936E-002 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** ~~~ ** ..Max Cool Load Comparison = 2.9675E-003 vs Loads
> >> Convergence Tolerance=4.00E-002 - Pass Convergence
> >> ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all
HVAC
> >> loops, at CHICAGO IL USA TMY2-94846 WMO#=725300, 10/09 19:15 -
19:30
> >> ** ~~~ ** The solution for one or more of the Air Loop HVAC
> >> systems did not appear to converge
> >> ** ~~~ ** Air System Named = WAHP PACKAGE SINGLE ZONE 4 did not
> >> converge for mass flow rate
> >> ** ~~~ ** Check values should be zero. Most Recent values listed
> >> first.
> >> ** ~~~ ** Demand-to-Supply interface mass flow rate check value
> >> iteration history trace:
> >>
0.329702,0.329702,0.329702,0.329702,0.329702,0.329702,0.329702,0.329702,\
\
> >> 0.329702,0.329702,
> >> ** ~~~ ** Supply-to-demand interface deck 1 mass flow rate check
> >> value iteration history trace:
> >>
0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,\
\
> >> 0.000000,0.000000,
> >> ** ~~~ ** Air System Named = WAHP PACKAGE SINGLE ZONE 4 did not
> >> converge for energy
> >> ** ~~~ ** Check values should be zero. Most Recent values listed
> >> first.
> >> ** ~~~ ** Demand-to-Supply interface energy check value iteration
> >> history trace:
> >>
7110.109302,7110.109302,7110.109302,7110.109302,7110.109302,7110.109302,\
\
> >> 7110.109302,7110.109302,7110.109302,7110.109302,
> >> ** ~~~ ** Supply-to-demand interface deck 1 energy check value
> >> iteration history trace:
> >>
0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,\
\
> >> 0.000000,0.000000,
> >> ** Warning ** SimHVAC: Maximum iterations (20) exceeded for all
HVAC
> >> loops, at CHICAGO IL USA TMY2-94846 WMO#=725300, 12/21 19:45 -
19:50
> >> ** ~~~ ** The solution for one or more of the Air Loop HVAC
> >> systems did not appear to converge
> >> ** ~~~ ** Air System Named = WAHP PACKAGE SINGLE ZONE 1 did not
> >> converge for mass flow rate
> >> ** ~~~ ** Check values should be zero. Most Recent values listed
> >> first.
> >> ** ~~~ ** Demand-to-Supply interface mass flow rate check value
> >> iteration history trace:
> >>
0.427247,0.427247,0.427247,0.427247,0.427247,0.427247,0.427247,0.427247,\
\
> >> 0.427247,0.427247,
> >> ** ~~~ ** Supply-to-demand interface deck 1 mass flow rate check
> >> value iteration history trace:
> >>
0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,\
\
> >> 0.000000,0.000000,
> >> ** ~~~ ** Air System Named = WAHP PACKAGE SINGLE ZONE 1 did not
> >> converge for energy
> >> ** ~~~ ** Check values should be zero. Most Recent values listed
> >> first.
> >> ** ~~~ ** Demand-to-Supply interface energy check value iteration
> >> history trace:
> >>
9453.547566,9453.547566,9453.547566,9453.547566,9453.547566,9453.547566,\
\
> >> 9453.547566,9453.547566,9453.547566,9453.547566,
> >> ** ~~~ ** Supply-to-demand interface deck 1 energy check value
> >> iteration history trace:
> >>
0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,\
\
> >> 0.000000,0.000000,
> >>
> >> I tried autosizing the plant as well and am getting the same
> >> result/problem.
> >>
> >> So I guess the final question is this a big deal? And if it is, how
> >> might I go about fixing it?
> >>
> >> Thanks for the help!
> >>
> >
> >
> >
> > ------------------------------------
> >
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> >
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> >
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> >
> >
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>





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- Re: [EnergyPlus_Support] Re: HeatPumpWaterToAirEquationFit Problem
  - From: Richard Raustad

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