[EnergyPlus_Support] HeatPumpWaterToAirEquationFit Problem

["tr1g92" <trig92@xxxxxxxxx>]

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
 

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.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___