Unmet Hours

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

20405 ●94 ●14 http://www.openstudio.net/

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.

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).
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.

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Comments

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 ( 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 ( 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 ( 2016-01-22 11:09:44 -0600 )edit

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

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 ( 2016-01-22 13:15:57 -0600 )edit

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