Forum discussion
NC-2009 EAp2: Minimum Energy Performance
I need to pin down the required efficiencies.
System Type: Packaged rooftop air conditioner
Fan Control: Constant Volume
Cooling Type: Direct Expansion (DX)
Cooling Capacity: (zone dependant, ranging from 5.2 kW to 0.1 kW)
Min Efficiency Requirements as per Table 6.8.1A Air Conditioners,
Equipment Type: Air Conditioners, air cooled (as DX coils are air cooled),
Size Category:
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Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
962 thumbs up
September 2, 2010 - 3:59 pm
You have two choices here:
1) if you model as a stand alone building, with purchased heat (steam or HW), you don't model the furnace. (G3.1.1.1). Instead both systems use purchased heat at the same utility rates. So efficiency is moot.
2) if you model the building plus plant, by my reading the baseline gets the furnace efficiencies listed in Table 6.8.1E.
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
September 3, 2010 - 7:02 am
Thanks. You're right, the efficiencies are moot. For documentation purposes, i've used the equipment as mentioned. Since I'm using the first option and therefore not modelling the plant.