Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

OpenStudio Increasing Load Convergence [closed]

asked 2015-12-21 09:02:47 -0500

Dustin's avatar

Having troubles with my model and believe the run time is being increased by the errors that are being written. Is there any way in OpenStudio to increase the "Load Convergence Tolerance Value"? It seems that when I increase it the value didn't actually increase.

* Warning * ControlCompOutput: Maximum iterations exceeded for ZoneHVAC:Baseboard:RadiantConvective:Water = CEILING 5NW * ~~~ * ... Load met = 3002.90162 W. * ~~~ * ... Load requested = 3007.63750 W. * ~~~ * ... Error = 0.15746170 %. * ~~~ * ... Tolerance = 0.10000000 %. * ~~~ * ... Error = (Load met - Load requested) / MAXIMUM(Load requested, 100) * ~~~ * ... Actuated Node Mass Flow Rate =4.441897944E-002 kg/s * ~~~ * Environment=RUN PERIOD 1, at Simulation time=01/01 00:00 - 00:15

I would expect the tolerance value to increase from .1% because I have changed the "Load Convergence Tolerance Value" in simulation settings multiple times with no change. Any pointers towards what I can do to slightly increase this value would be awesome.

edit retag flag offensive reopen merge delete

Closed for the following reason the question is answered, right answer was accepted by Dustin
close date 2015-12-21 09:53:23.648438


I did confirm that we write "Load Convergence Tolerance Value" To the "OS:SimulationControl" object in the OSM file (if you change the default value) and that in turn is written to the "Building" object in the IDF. You may want to confirm the value in your IDF. There may be another tolerance setting that relates to your error?

David Goldwasser's avatar David Goldwasser  ( 2015-12-21 09:37:29 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2015-12-21 09:53:12 -0500

Dustin's avatar

One of the comments in this post answer the question.

In the equipment tab and looking at the ZoneHVAC:Baseboard:RadiantConvective:Water the very last field will be the convergence limit.

edit flag offensive delete link more


Question Tools

1 follower


Asked: 2015-12-21 09:02:47 -0500

Seen: 192 times

Last updated: Dec 21 '15