Jeremiah,
I ran your file on my machine on Denver weather file after changing the relaxation factor to 1 and increasing the # of max warm up period to 100 and set the min warm up period to 6.
E+ version 7 (32 bits) your is 64bits.
Here is what I got:
Program Version,EnergyPlus-32 7.0.0.036, 3/20/2012 9:43 PM,IDD_Version 7.0.0.036
************* Beginning Zone Sizing Calculations
************* 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
************* Simulation Error Summary *************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
************* EnergyPlus Completed Successfully-- 0 Warning; 0 Severe Errors; Elapsed Time=00hr 11min 7.11sec
************* Beginning Zone Sizing Calculations
************* 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
************* Simulation Error Summary *************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
************* EnergyPlus Completed Successfully-- 0 Warning; 0 Severe Errors; Elapsed Time=00hr 11min 7.11sec
So, it might be the relaxation factor that gave those warnings. Try 0.5 or 1.
regards,
saleh
From: CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Tuesday, March 20, 2012 7:36 PM
Subject: [EnergyPlus_Support] Convergence issue-- does this matter?
Dear List,
I have been working on this file for many a days, attempting to have a warning free run.
The simulation is for a Phase Change Material, and is producing good results so far as energy savings, heat flux reduction, HVAC size reduction, and Peak load reduction. The file is to be used in a climate study of various melt temperatures, so determine best product for each ASHRAE climate.
There are no errors without the PCM, and I have all three convergence settings, and relaxation at max values (the file did not work with lower)
I realize I could ignore this, but would like to figure out the issue and fix it if at all possible... Thanks
Program Version,EnergyPlus-64 7.0.0.036, 3/20/2012 4:37 PM,IDD_Version 7.0.0.036
************* Beginning Zone Sizing Calculations
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.344E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 05:16 - 05:18
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.288E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 07:28 - 07:30
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.199E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 09:56 - 09:58
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.106E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 12:08 - 12:10
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.005E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 15:16 - 15:18
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.170E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=COOL, at Simulation time=08/21 18:44 - 18:46
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.018E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=HEAT, at Simulation time=02/21 09:46 - 09:48
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.401E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=HEAT, at Simulation time=02/21 15:46 - 15:48
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.421E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** During Sizing, Environment=HEAT, at Simulation time=02/21 17:32 - 17:34
************* 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 ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.347E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 05:16 - 05:18
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.288E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 07:28 - 07:30
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.199E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 09:56 - 09:58
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.105E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 12:08 - 12:10
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.005E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 15:16 - 15:18
** Warning ** Inside surface heat balance did not converge with Max Temp Difference [C] =1.170E-002 vs Max Allowed Temp Diff [C] =1.000000E-002
** ~~~ ** Environment=COOL, at Simulation time=08/21 18:44 - 18:46
************* Simulation Error Summary *************
*************
************* ===== Recurring Error Summary =====
************* The following recurring error messages occurred.
*************
************* ** Warning ** Inside surface heat balance convergence problem continues
************* ** ~~~ ** This error occurred 459 total times;
************* ** ~~~ ** during Warmup 0 times;
************* ** ~~~ ** during Sizing 0 times.
************* ** ~~~ ** Max=5.370517E-002 [C] Min=9.900995E-003 [C]
*************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 9 Warning; 0 Severe Errors.
************* EnergyPlus Completed Successfully-- 474 Warning; 0 Severe Errors; Elapsed Time=00hr 26min 21.93sec
Jeremiah D. Crossett
CleanTech Analytics
503-688-8951
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