[EnergyPlus_Support] Detailed Ice Storage system warning [2 Attachments]

["Jeremiah Crossett jcrossett@xxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Dear List,

I am modeling an existing building with a 20 ton chiller and 82 ton hour latent energy storage system that uses our bio based PCM as a replacement for ice. We expect that using a higher melting temperature will save energy consumption compared to ice and enable retrofit scenarios that would not be possible with the sub zero supply temperatures.  To model this I have set the transition temperature to 5.5C, and nighttime charge temperature from chiller supply loop at 2.2C.  

For comparison I have also made the same model with ICE.  I used the charge and discharge curves from ICE in the PCM storage tank model.  

The problem I am hopeful you could help me to better understand is the recurring warning pasted below.   I think it is saying that I have caused model instabilities. 

I am wondering if anyone has any suggestions for how I might change the model to not produce this warning / instability? --->Thanks  

   **   ~~~   **  Environment=ANNUAL, at Simulation time=01/03 17:30 - 17:40

   ** Warning ** Detailed Ice Storage model exceeded its internal discharging maximum iteration limit

   **   ~~~   ** Detailed Ice Storage System Name = LESS TANK

   **   ~~~   **  Environment=ANNUAL, at Simulation time=01/03 17:30 - 17:40

   ************* ===== Recurring Error Summary =====

   ************* The following recurring error messages occurred.

   *************

   *************  ** Warning ** Detailed Ice Storage system [LESS TANK]  discharging maximum iteration limit exceeded occurrence continues.

   *************  **   ~~~   **   This error occurred 29163 total times;

   *************  **   ~~~   **   during Warmup 0 times;

   *************  **   ~~~   **   during Sizing 0 times.

â??â??

Jeremiah D. Crossett  | Senior Analyst  | LEED Green Associate 

â??â??

120 E. Pritchard St.  | Asheboro, NC 27203 

â??â??

 | Mobile 503-688-8951

www.phasechange.com 

  

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Posted by: Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>

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