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:
LEEDuser is supported by our premium members, not by advertisers.
Go premium forTo post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.
A portion of our building envelope is historic. Can we exclude it from our model?
For an existing building, do I need to rotate the model?
Our process load is higher than 25%. Do we have to justify that?
Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?
Can mezzanines open to floors below be excluded from the energy model?
How do I provide a zip code for an international location?
For a project outside the U.S., how do I determine the climate zone?
For a project outside the U.S., how do I determine the Target Finder score?
Do hotel rooms need automatic light shut-off control?
How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?
The Section 9 space-by-space method does not include residential space types. What should I use?
Can the Passive House Planning Package (PHPP) be used to energy model for LEED?
Which baseline HVAC system do I use if my building has no heating or air conditioning?
Our project has a diesel backup generator. Should we include it in our energy model?
Can SHGC be higher in the proposed than in the baseline model?
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 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.