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

PAT baseline setup

asked 2016-01-22 09:19:30 -0600

ngkhanh's avatar

updated 2017-08-20 15:02:54 -0600

Hello, I want to test various alternatives by whole HVAC systems in PAT. Unfortunately, my measures are pretty simple and not able to remove HVAC objects so baseline need to be HVAC-empty models. How to set baseline in result as baseline plus one measure and alternative as baseline plus other measures ? Thanks

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2016-01-22 09:54:05 -0600

That's a good question. In a future version of PAT you will be able to set any design alternative to be the 'baseline' for reporting purposes.

I see a few options now.

  1. The clean option would be to put an HVAC system in the baseline model, then for each design alternative add a measure that removes all HVAC equipment, before running measure to add new system. We do have measures that do this along with other things, but not a dedicated measure for this. Need to think about things like if SWH loops are also removed, zone exhuast, the air loop diagram (which zones are on which loops, is that maintained).
  2. The quick ugly way would be to just have no HVAC system or ideal air loads in the baseline, and then create a design alternative that represents your baseline. You can still compare it against others my how much saver over the no-HVAC baseline run.
edit flag offensive delete link more


One question I've always had when swapping systems is if a clean system swap is enough. If the system you are putting in is radiant, do you only want to adjust thermostat setpoints for affected zones. Similar question is applicable if UFAD system and ventilation.

David Goldwasser's avatar David Goldwasser  ( 2016-01-22 09:58:05 -0600 )edit

Thank i am waiting for new features in PAT. Hope to see it with OS 1.11 :))

ngkhanh's avatar ngkhanh  ( 2016-01-22 10:54:52 -0600 )edit

Won't be that soon, big PAT update is schedule for release at the end of September.

David Goldwasser's avatar David Goldwasser  ( 2016-01-22 11:09:44 -0600 )edit

So i need to add each osm manually until September :(

ngkhanh's avatar ngkhanh  ( 2016-01-22 11:53:27 -0600 )edit

I assumed you would have one seed model and, that you had a different measure for each type of HVAC system. If you have to have the baseline correct in Pat results (using EDAPT) then Option 1 would work much sooner.

David Goldwasser's avatar David Goldwasser  ( 2016-01-22 13:15:57 -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: 2016-01-22 09:19:30 -0600

Seen: 102 times

Last updated: Jan 22 '16