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kbenne / cbecc

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central plant modeling #934

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Hello, I am wondering if you can advise me on the correct way to model an 
existing central plant that serves multiple building with a new building being 
added to the service. I would like to not model the plant with minimum 
efficiencies as the existing plant has more efficient equipment than the code 
baseline. The Title-24 hotline referred my question to you.

Original issue reported on code.google.com by f.le...@gmail.com on 7 Feb 2015 at 12:21

GoogleCodeExporter commented 9 years ago 
While CBECC does not explicitly handle central plant systems, you can model the 
situation you describe.  Set the compliance type to ExistingAlteration.  Model 
your new building as normal, setting all components in the building to 
“New.”  Include the central plant, modeling it as it exists with full 
capacities for all components.  All central plant components should have their 
status set to “Existing.”  Then on the project data screen, for the total 
building enter the floor areas of all the buildings served by the central 
plant, including the new building.  The modeled new building should show up as 
the addition floor area.  

When the simulation is run, the capacities of the central plant equipment 
should be scaled based on the new versus total floor area, with efficiencies 
remaining unchanged.

Original comment by rhedr...@archenergy.com on 7 Feb 2015 at 12:40