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

How Could I optimize thermal comfort?

asked 2020-11-26 11:34:44 -0600

kimiya's avatar

Hi everyone, I am going to optimize cooling and heating demand considering annual thermal comfort(based on ashrae55). I used jeplus+EA for optimization. The problem is I got several PPD (%) values for different zones, while Designbuilder gave me just an annual value. I do not know if I should use the maximum value or the average? And how could I figure this code in the RVX file?

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2020-11-28 06:33:07 -0600

Yi Zhang's avatar

Good question! Think about when you are designing a building, do you want all the spaces to be comfortable, or some are "very comfortable" so that the others can be less so?

I'd say you should use the maximum, and use that as a constraint in your project so that once the threshold is reached, the algorithm does not need to push any further. You have two options to do this in jEPlus+EA. The first one is defining a report variable for max of the PPDs. You can use an equation like "v1=Math.max(c2, c3, c4 ...)" - hope you don't have too many zones - and then add a constraint, say "s1=v1", and define its feasible and scaling ranges. If you have only a few zones, the alternative is to simply list them all as constraints. In this way, you can actually control the comfort level you want to provide for each zone.

Here are the relevant parts of the manual:


edit flag offensive delete link more


I really appreciate your help. Thank you.

kimiya's avatar kimiya  ( 2020-11-30 14:07:48 -0600 )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



Asked: 2020-11-26 11:34:44 -0600

Seen: 910 times

Last updated: Nov 28 '20