Warnings while simulating a walk-in freezer using Air-chiller object

asked 2023-03-13 06:40:11 -0500

Zakaria's avatar

updated 2023-03-17 09:10:54 -0500

Hello community,

I'm currently working on simulating a walk-in freezer using the Air-chiller object, but I've come across some warnings. If anyone has any suggestions on how to get rid of them, I would greatly appreciate your help.

Thank you.

Program Version,EnergyPlus, Version 9.0.1-bb7ca4f0da, YMD=2023.03.13 11:53,
----------Testing Individual Branch Integrity
---------- All Branches passed integrity testing
---------- Testing Individual Supply Air Path Integrity
----------  All Supply Air Paths passed integrity testing
---------- Testing Individual Return Air Path Integrity
---------- All Return Air Paths passed integrity testing
---------- No node connection errors were found.
---------- Beginning Simulation ---------- 
----------  Warning ---------- 
---------- **Zone Air Heat Balance is out of balance for zone named WALK-IN ZONE**
---------- **Zone Air Heat Balance Deviation Rate is more than 329.2 {W}**
---------- **Occurrence info: Environment=RUN PERIOD, at Simulation time=08/10 00:00 - 00:03****
 ===== Recurring Error Summary =====
---------- The following recurring error messages occurred. ---------- 
   ----------  Warning ---------- 
---------- **Refrigeration:System chilling WarehouseCoils FREEZER SYSTEM - Refrigeration system unable to meet load of warehouse coils chilled by system ... continues by derating coil load**
---------- This error occurred 649 total times;
---------- during Warmup 649 times;
---------- during Sizing 0 times---------- 
----------  Warning ---------- Zone Air Heat Balance is out of balance ... zone named WALK-IN ZONE
---------- This error occurred 1462 total times;
----------   during Warmup 0 times;
----------   during Sizing 0 times.
----------   Max=798.602495 {W}  Min=6.010614E-002 {W}---------- 
===== Final Error Summary =====
---------- The following error categories occurred.  Consider correcting or noting.
---------- Zone Air Heat Balance Warnings
---------- ..Zone Air Heat Balance out of Balance warnings are currently used by developers.
---------- Users can safely ignore these warnings---------- 
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.

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Thank you

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Zakaria, Have you created some output variables and reviewed them to see what is happening (in more detail than is given by the warning)? Often, when you see details of the timestep (fan is on/off, zone temp, coil output, etc.) it provides insights regarding the cause of the problem.

Jim Dirkes's avatar Jim Dirkes  ( 2023-03-19 05:48:20 -0500 )edit