RE: [EnergyPlus_Support] Loads Initialization problem

Richard.

I noticed that many people are using one day weather file for sizing run, and using one day weather file run period simulation.

May be you should add a warning that DesignDay sizing is preferred. All the other mode of sizing and simulation should be reserved for advanced users who have read the manual.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: RRaustad@xxxxxxxxxxxx
Date: Mon, 22 Aug 2011 09:14:00 -0400
Subject: Re: [EnergyPlus_Support] Loads Initialization problem

Not sure if this is good or bad without more information. This is just an initialization step and does not necessarily mean the simulation results would be wrong. It just means that the program could not find a starting point that was repeatable. So is the temperatures in your simulation oscillating around some point, or do they continually change for each warmup day?

You can report zone temps (Output:Variable,*,Zone Mean Air Temperature,hourly;) and then turn on the reporting during warmup (Output:Diagnostics,ReportDuringWarmup) to see the zone temps as the program sees them.

Plot these for each day to see how they change during the warmup period. Also notice you are getting nearly the same loads (within 0.03 Watts), but these loads just don't happen at the same zone temperatures.

On 8/22/2011 9:05 AM, rahsan wrote:

Dear All

I have problem with simulating my idf file. I was able to solve most of the errors untill 1 only one error remaining. Altough I increased the warm up days to 30 and more but still couldnt get a result.

Do you have any idea how i can solve this initialization problem?
Thank you very much
Rahsan

** Severe ** Loads Initialization did not Converge (CheckWarmupConvergence) after 25 warmup days.
** ~~~ ** ..Environment=KAYNAKLAR
** ~~~ ** ..Max Temp Comparison=2.85 vs Temperature Convergence Tolerance=0.40 - Fail Convergence
** ~~~ ** ..Min Temp Comparison=0.82 vs Temperature Convergence Tolerance=0.40 - Fail Convergence
** ~~~ ** ..Max Heat Load Comparison=3.0962E-002 vs Loads Convergence Tolerance=4.00E-002 - Pass Convergence

-- 
Richard A. Raustad
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Florida Solar Energy Center
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