RE: [EnergyPlus_Support] Maximum iterations (100) exceeded

I can imagine Jean solving the world’s energy modeling problems from his iPhone while buying groceries or having a cup of coffee�.

James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Miroslav Bratanov
Sent: Wednesday, January 09, 2013 12:26 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Maximum iterations (100) exceeded

Found it!
Thank you very much, Jean!
The problem was that I had forgotten to manually set the air flow of the zone terminal. It was left to autosize and the airflow was 0 m3/s even though the rest of the components were sized correctly.

Miroslav

On 9.01.2013 14:06, jeannieboef wrote:

try turning off mechanical systems and see if the zone temperature is behaving as expected. report infiltration rates. then report the flows and temperatures on the exit nodes of your mechanical systems when you switch them back on.

Jean

Sent from my iPhone

On 09.01.2013, at 12:38, Miroslav Bratanov <miroslav_bratanov@xxxxxxxxx> wrote:

Hello all,

Can anyone decode this for me please? I can't understand what's causing
this error and I don't know how to solve it.

Please, help!

Miroslav

** Warning ** SimHVAC: Maximum iterations (100) exceeded for all
HVAC loops, at ANNUAL1, 05/02 05:00 - 05:15
** ~~~ ** The solution for one or more of the Air Loop HVAC
systems did not appear to converge
** ~~~ ** Air System Named = PSZ AC F016 did not converge for
mass flow rate
** ~~~ ** Check values should be zero. Most Recent values listed
first.
** ~~~ ** Demand-to-Supply interface mass flow rate check value
iteration history trace:
0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,
** ~~~ ** Supply-to-demand interface deck 1 mass flow rate check
value iteration history trace:
0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,0.201914,
** ~~~ ** Air System Named = PSZ AC F016 did not converge for energy
** ~~~ ** Check values should be zero. Most Recent values listed
first.
** ~~~ ** Demand-to-Supply interface energy check value
iteration history trace:
4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,4800.364447,
** ~~~ ** Supply-to-demand interface deck 1 energy check value
iteration history trace:
5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,5078.588825,
** ~~~ ** Node named G102 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 0.392272
** ~~~ ** Node named G102 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
0.392272,0.392423,0.392272,0.392423,0.392272,0.392423,0.392272,0.392423,0.392272,0.392423,
** ~~~ ** Node named G102 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G102 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G108 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 0.187170
** ~~~ ** Node named G108 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,
** ~~~ ** Node named G108 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G108 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G109 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 0.187170
** ~~~ ** Node named G109 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,0.187170,0.187081,
** ~~~ ** Node named G109 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G109 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G110 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 6.276358E-003
** ~~~ ** Node named G110 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,
** ~~~ ** Node named G110 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G110 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G112 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 3.698568E-002
** ~~~ ** Node named G112 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
3.698568E-002,3.696805E-002,3.698568E-002,3.696805E-002,3.698568E-002,3.696805E-002,3.698568E-002,3.696805E-002,3.698568E-002,3.696805E-002,
** ~~~ ** Node named G112 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G112 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G113 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 5.603891E-002
** ~~~ ** Node named G113 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
5.603891E-002,5.601220E-002,5.603891E-002,5.601220E-002,5.603891E-002,5.601220E-002,5.603891E-002,5.601220E-002,5.603891E-002,5.601220E-002,
** ~~~ ** Node named G113 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G113 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G114 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 6.276358E-003
** ~~~ ** Node named G114 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,6.276358E-003,6.278770E-003,
** ~~~ ** Node named G114 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G114 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G117 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 4.046009E-002
** ~~~ ** Node named G117 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
4.046009E-002,4.047564E-002,4.046009E-002,4.047564E-002,4.046009E-002,4.047564E-002,4.046009E-002,4.047564E-002,4.046009E-002,4.047564E-002,
** ~~~ ** Node named G117 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G117 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G118 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 7.509214E-002
** ~~~ ** Node named G118 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
7.509214E-002,7.505635E-002,7.509214E-002,7.505635E-002,7.509214E-002,7.505635E-002,7.509214E-002,7.505635E-002,7.509214E-002,7.505635E-002,
** ~~~ ** Node named G118 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G118 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G120 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 3.889100E-002
** ~~~ ** Node named G120 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
3.889100E-002,3.887247E-002,3.889100E-002,3.887247E-002,3.889100E-002,3.887247E-002,3.889100E-002,3.887247E-002,3.889100E-002,3.887247E-002,
** ~~~ ** Node named G120 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G120 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
** ~~~ ** Node named G201 SUPPLY INLET shows oscillating mass
flow rate across iterations with a repeated value of 0.275711
** ~~~ ** Node named G201 SUPPLY INLET mass flow rate [kg/s]
iteration history trace (most recent first):
0.275711,0.275817,0.275711,0.275817,0.275711,0.275817,0.275711,0.275817,0.275711,0.275817,
** ~~~ ** Node named G201 SUPPLY INLET shows oscillating
temperatures across iterations with a repeated value of 23.517455
** ~~~ ** Node named G201 SUPPLY INLET temperature [C] iteration
history trace (most recent first):
23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,23.517455,23.517268,
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