Re: [EnergyPlus_Support] Re: HeatPumpWaterToAirEquationFit Problem

[Richard Raustad <RRaustad@xxxxxxxxxxxx>]

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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-- 
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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