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

Is there a way in EP to forgo the initial warmup calculations?

asked 2016-07-20 08:59:07 -0500

Ashish_Sinha's avatar

updated 2016-07-20 15:07:02 -0500

let's say we have run EP for a building from time = 0 hour to time = 2 hour, and we store the output data about thermal state of the house and CLOSE the EP sesison.

Next time I need to simulate the same house from time 2 hours to time 3 hours. I will definitely have to open a fresh EP session to do so, and it will go over the warm up period again.

I want to save this time spent on warmup calculations, because from the previous run (from time = 0 to time = 2), I already have the thermal condition of the house at the end of time t = 2. Is there a way to provide this information to the new EP session, so that it does not do warmup calculations again?

Appreciate any help, thank you, -Ashish

edit retag flag offensive close merge delete


I don't see how that would work if you're making changes to the model. If the initial thermal conditions are exactly the same, that would probably mean the model is exactly the same, so why are you re-running it?

Adam Hilton's avatar Adam Hilton  ( 2016-07-20 09:39:55 -0500 )edit

Dear Adhilton, I am using an energy plus model for predictive control of HVAC. This requires me to predict future thermal states of a building under different series of HVAC set points for future. Once I do that, I evaluate which series will use less energy, and I go with that. Consider that I have the building history from time t = 0 to time t = 2 h. Now (at t = 2 hours), I need to evaluate multiple series of HVAC setpoints for future. If there are 10 different series, then I have to initiate 10 different EP sessions to predict the 10 different behavior of the building.

Ashish_Sinha's avatar Ashish_Sinha  ( 2016-07-20 10:46:39 -0500 )edit

I'd use BCVTB to process control values outside of E+ instead of doing parametric runs.

Adam Hilton's avatar Adam Hilton  ( 2016-07-20 10:49:51 -0500 )edit

continuing... , so 10 diff EP sessions consume 10 times the time needed for warmup. And all this despite the fact that I already have the state of the building known at time t = 2 hours. And an EP session is already alive that contains the state of building at time t = 2 hours. It is alive and waiting for me to give it the HVAC setpoint that uses least energy.

How do I avoid going through warmups multiple times? it is taking too much time and making my approach impractical.

Please help

Ashish_Sinha's avatar Ashish_Sinha  ( 2016-07-20 10:50:00 -0500 )edit

ok, I am using MLE+ (matlab-EnergyPlus tool) I guess I will have to use BCVTB then.

Ashish_Sinha's avatar Ashish_Sinha  ( 2016-07-20 10:54:32 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2016-07-20 12:47:27 -0500

Archmage's avatar

There is an existing uservoice item for requesting this

edit flag offensive delete link more


Dear Archmage, yes, thank you. this uservoice is just what I want to express. On the user voice there are no answers to this question, so I guess, I wouldhave to wait till this feature is added in energy plus.

Ashish_Sinha's avatar Ashish_Sinha  ( 2016-07-20 17:23:23 -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: 2016-07-20 08:59:07 -0500

Seen: 133 times

Last updated: Jul 20 '16