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Simulation fails after modeling shadings

asked 2017-10-18 12:19:49 -0500

Elissa gravatar image

updated 2017-10-18 13:08:16 -0500

Hello,

I'm modeling a modernist residencial house in order to get information on temperature, humidity and luminance. As it has a complex geometry (after starting over from scratch many times) I decided do model space per space and run the simulation after each modification in the model.

The last I left last to model was the shadings, and since I started, the simulation hasn't completed any more. Is there any orientation regardin applying shadings I should follow (no width including while modeling, any offset distance from walls or anything you consider important)? Any reason why this is happening?

NOTE: I haven't assigned materials to surfaces yet, I decided to do so after completing the geometry and solving its problems, so the simulation I'm running after each space is modeled does not include its specific constructions and materials. Bad decision?

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What errors are shown in your eplusout.err file? See this question on how to access the .err file.

mdahlhausen gravatar image mdahlhausen  ( 2017-10-19 12:05:02 -0500 )edit

Final Error Summary ===== *** The following error categories occurred. Consider correcting or noting. *** Nominally Unused Constructions *** ..The nominally unused constructions warning is provided to alert you to potential conditions that can cause *** ..extra time during simulation. Each construction is calculated by the algorithm indicated in the HeatBalanceAlgorithm *** ..object. You may remove the constructions indicated (when you use the DisplayExtraWarnings option).


*** EnergyPlus Warmup Erro

Elissa gravatar image Elissa  ( 2017-10-19 12:26:05 -0500 )edit

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answered 2017-10-19 12:46:11 -0500

* Severe * GetHeatBalanceInput: There are surfaces in input but no zones found. Invalid simulation.

Make sure the OpenStudio spaces are assigned to ThermalZones. You can have a one to one mapping between thermal zones and spaces or you can have multiple spaces in a single zone.

I'm a little confused, was the simulation running before the shading surfaces were added or is this the first time you attempted to run the simulation. You also mentioned that constructions are not assigned yet. That will also prevent the simulation from running. Typically you start with default constructions and then modify them as you have modify them as you have more information about your constructions.

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Yes, the simulation was running before I added the shading surfaces.

About the constructions... I haven't edited them yet, so I'd been running a simulation right after each space creation and using the default constructions which I plan to edit after finishing the shadings. I just realized that after creating the first shading, the simulation was running normally.

Elissa gravatar image Elissa  ( 2017-10-19 13:03:08 -0500 )edit

Right after that, I offseted the shading I had just created 5 centimeters from the building geometry and the simulation started running again.I'll try adding more shadings and see if it's still running.

Elissa gravatar image Elissa  ( 2017-10-19 13:05:27 -0500 )edit

what happens when you save a copy of your model, delete the shadings you added, and try to run it?

mdahlhausen gravatar image mdahlhausen  ( 2017-10-19 13:54:55 -0500 )edit

The simulation starts running again. But, to make it run WITH the shadings, it seems it cannot touch the geometry of the building, for that reason I tried offseting it 5cm, saved a copy, ran the simulationa again and it worked again.

The other thing I guess might be preventing the simulation to run is not assigning a space to each shading created, does that make sense?

Elissa gravatar image Elissa  ( 2017-10-21 09:37:18 -0500 )edit

you shouldn't need to assign a space - shadings can be part of a shading group on their own. Are you building shading with the shading group?

mdahlhausen gravatar image mdahlhausen  ( 2017-10-21 13:51:02 -0500 )edit

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Asked: 2017-10-18 12:19:49 -0500

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Last updated: Oct 19 '17