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

I want to control the Air mass flow rate of VAV box. Is this viable in EnergyPlus?

asked 2018-11-02 09:43:22 -0500

Fan's avatar

updated 2018-11-02 13:25:14 -0500

I want to control the Air mass flow rate of VAV box. We know in E+, a controller:WaterCoil is used to control the outlet air temperature of VAV box to meet the temperature setpoint. For some reasons, I am planning to control both the temperature and mass flow rate of the supply air on the outlet node of VAV box. Is this viable in EnergyPlus? If so, how can I realize this?

Thanks in advance.

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2018-11-02 10:01:48 -0500

Overriding the simulation result can be accomplished using the Energy Management System in EnergyPlus. See the EMSApplicationGuide documentation for more information. The only actuator I see for VAV boxes is for the AirTerminal:SingleDuct:ConstantVolume:NoReheat object. There are multiple example files, all starting with EMS*.idf, that can be used to get familiar with EMS programming. Once your up to speed you can customize controls that are not currently available in E+.

edit flag offensive delete link more


But this object--AirTerminal:SingleDuct:ConstantVolume:NoReheat is for CAV system, isn't it??

Fan's avatar Fan  ( 2018-11-02 10:08:20 -0500 )edit

It is typically used that way, but if you are controlling the air mass flow rate through this object it acts like a VAV box. You won't have access to a VAV box heating coil but if the controls are correct then you shouldn't need reheat.

rraustad's avatar rraustad  ( 2018-11-02 10:27:42 -0500 )edit

I have recently re-done this model, and I found your solution really works. Thanks for your answer.

Fan's avatar Fan  ( 2021-03-11 01:01:19 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops


Question Tools

1 follower


Asked: 2018-11-02 09:43:22 -0500

Seen: 297 times

Last updated: Nov 02 '18