First time here? Check out the Help page!

Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
1

Time not Meeting Adaptive Comfort Percentage

asked Feb 21

mther's avatar

updated Feb 22

I'm in the process of analyzing time not meeting adaptive comfort (ASHRAE 55) in the Adaptive Comfort Summary. I realize this is during occupied hours, but my values seem to be above the hours occupied?

For example a zone is occupied by 33 students (100%) from 7am-2pm, and the teacher (3%) stays until 4:30pm. The total amount of school days in a year is 179. How does OpenStudio calculate the total occupied hours?

The school day for all occupants is 9 hours. If I'm not missing anything, I should be arriving at 1611 occupied hours in the year. However, my time not meeting the adaptive comfort model (80%) is 1934, and 2477 for the 90% limit. This would be well above the occupied hours.

With added shading as part of our interventions, we were able to get the 80% limit to 1819, which is 114 uncomfortable hours reduced.

What would a possible interpretation of these values? Having been to the actual room it truly is quite uncomfortable and our model is at an acceptable NMBE of less than 5%. I'm curious how to explain these results.

EDIT: Here's the OSM, if anyone can help me pinpoint this problem.

Preview: (hide)

Comments

@mther can you upload your model to Google Drive, Dropbox, etc. and then share a URL for others to download? That would help others provide better solutions.

Aaron Boranian's avatar Aaron Boranian  ( Feb 22 )

@Aaron Boranian Updated the post with the link. Thanks!

mther's avatar mther  ( Feb 22 )

1 Answer

Sort by » oldest newest most voted
1

answered Feb 23

mther's avatar

I finally was able to pinpoint it with the help of my adviser. It seems OS is running adaptive comfort for the run period AND the sizing period, leading to values way above the occupied hours.

Turning off "Run Simulation for Sizing Periods" in the Simulation Settings did the trick. I now have values for Uncomfortable Hours within my occupied hours!

Preview: (hide)
link

Your Answer

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

Add Answer

Training Workshops

Careers

Question Tools

2 followers

Stats

Asked: Feb 21

Seen: 84 times

Last updated: Feb 23