[EnergyPlus_Support] Re: HeatPumpWaterToAirEquationFit Problem

["Jean marais" <jeannieboef@xxxxxxxxx>]

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!
>




------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/