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

EP "Small office" model: Temperature oscillations

asked 2021-09-21 03:30:58 -0500

MPK's avatar

updated 2022-02-06 12:06:35 -0500

I compiled an EP prototype building model (Small office, ASHRAE 90.1, 2019, Seattle) into an FMU and studied its behavior. Sometimes, there are strong oscillations in the room temperature when the heat pump/chiller go through repeated on/off cycles. I noticed that this mostly occurs during unoccupied hours.

In the attached plot, you see a few days of operation of one room during summer. On top is the room temperature (setpoint and actual), center-left is the electric and thermal power of the chiller, bottom-left is the power of the fan and bottom-right is the occupancy. Temperatures are in °C, powers are in W and the x-axis is in days.

Is there a way to make this smoother? As far as I understand, EP usually sets the setpoint temperature and then retroactively calculates the necessary heating/cooling power.


edit retag flag offensive close merge delete

1 Answer

Sort by » oldest newest most voted

answered 2021-09-21 04:02:14 -0500

BaseboardHeater's avatar

Look at the fraction radiant factor.

In my case, I could reduce the oscillation with increasing this parameter.

edit flag offensive delete link more

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: 2021-09-21 03:30:58 -0500

Seen: 59 times

Last updated: Sep 21 '21