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

BEopt component load

asked 2023-01-12 14:39:54 -0500

lihao2004's avatar

I am using Ver 3. I just noticed that the sum of heating component load is much greater than heating delivered load. And same thing for cooling. My "loads not met" is 0 hour. Doesn't it mean the sum of component load should be less than the load delivered? Also, if they are different, does output have the sum of component load anywhere? It's not convenient if I just want to check the load. thanks

edit retag flag offensive close merge delete


Can you provide your BEopt project file via, e.g., Google Drive or Dropbox?

shorowit's avatar shorowit  ( 2023-01-12 19:31:51 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2023-01-27 11:03:00 -0500

Without your project file or a screenshot, it's impossible to know what you're seeing.

It is true that the sum of component loads will not exactly equal the delivered load. The component loads are estimations based on instantaneous heat transfers. As an example, for any given timestep in EnergyPlus, any solar gains are counted in the component load, but not all of that solar energy is immediately seen by the HVAC system; some is absorbed by the thermal mass of the building and there is a time lag until that energy is seen by the HVAC system. So the delivered energy by the HVAC system is not perfectly aligned with how component loads are estimated.

On the other hand, it's possible that you are just being confused by the fact that some of the component loads can be negative. Those component loads below the x-axis are negative:

image description

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


Asked: 2023-01-12 14:39:54 -0500

Seen: 48 times

Last updated: Jan 27 '23