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I can't get a furnace to run

asked 2016-09-26 09:13:11 -0600

EnergyNerd gravatar image

updated 2016-09-26 12:03:04 -0600

I am testing a one space model with a furnace to be sure I understand how it works before I test run a much more complicated model with many furnaces. I have followed all of the steps in any videos I could find for the simple one space model but the run fails. Can I send someone the OSM file to view the error codes? I cannot decipher them and have no idea what to change. Thanks. This project is for PACE funding for a multifamily building. It is due this Friday. We have the complicated model already built. I just need to know what I am missing when running an OSM file with a furnace.

Thank you so much.

Bob Tinker

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See This page on viewing simulation errors. If you post the error here it will be easier for people to provide advice. If the model runs without the furnace, but not with it, my first guess is that you may not have not added design days to your model. You can see more about design days at this page.

David Goldwasser gravatar image David Goldwasser  ( 2016-09-26 09:38:05 -0600 )edit

David, I checked the simulation error text. I had the design days added so that did not show up. The main problem appears to be the ventilation air controller. The error code is says:

* Severe * IP: IDF line~4188 Object=CONTROLLER:MECHANICALVENTILATION, name=CONTROLLER MECHANICAL VENTILATION 1, Required Field=[Zone 1 Name] was blank. * Warning * IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details. * ~~~ * Possible Invalid Numerics or other problems * Fatal * IP: Errors occurred on processing IDF file. Preceding conditi

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 10:21:13 -0600 )edit

I am just using the standard furnace template.I cannot find the line to which the error code refers. Is there any information on the use of the mechanical ventilation module? When I tried removing it, I ran into additional errors in the run.

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 10:24:04 -0600 )edit

David, I just located a discussion that you had with kbenne that appeared to be relevant to my issue. Can you discuss?. Here is the link:

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 10:40:04 -0600 )edit

I added a diffuser to the furnace system diagram. That got the model into energy plus but now there are issues with a thermostat. I don't see how to add one. This there a screen shot of a successful furnace air loop that I can see?

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 11:00:32 -0600 )edit

2 Answers

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answered 2016-09-26 11:59:12 -0600

You can add heating and cooling setpoint schedules on the thermal zone tab.

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Yes, I see the thermal zone tab and the placeholder for heating thermostat schedule. However, there are no thermostat schedules in my library and I could not find any in the BCL and none downloaded for my building type, midrise apartment. ????

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 15:14:34 -0600 )edit

David, I selected the constant temperature schedule for my simple model, but it still will not complete the run. I still get errors that there is no thermostat and there is no air flow.

EnergyNerd gravatar image EnergyNerd  ( 2016-09-26 15:30:53 -0600 )edit

answered 2016-09-26 13:08:26 -0600

See @aparker's answer to this question for fixing Controller:MechanicalVentilation errors.

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Asked: 2016-09-26 09:13:11 -0600

Seen: 87 times

Last updated: Sep 26 '16