Dear All,
In a project to be LEED certified, we have the following areas:
10400 m2 retail and restaurant
11000 m2 residential (multifamily)
12000 m2 underground car parking
In selecting the baseline HVAC system, would this be considered a
RESIDENTIAL or NONRESIDENTIAL building type? What is the criteria for
selection?
Thank you,
Omer Moltay
Omer,
In ASHRAE 90.1-2007, Section G3.1.1 Exception A States "Use additional system types for nonpredominant conditions (ie. residential/nonresidential or heating source) if those conditions apply to more than 20,000 SF of conditioned floor area."
That means you will have one baseline system type from Table G3.1.1A for the residential spaces (System 1 or 2). Then do a second system selection type for the remainder of the building using the same table. Note that there are further exceptions that might allow you to break out additional systems based on space loads etc.
Nathan Miller
Omar,
the table I am showing is very sketchy, as you have to give more
information (i.e., # of floors, etc),
but, this may get you started:
you will have to look at ASHRAE 90.1-2004 or latest, table(s) G3.1.1
page 176
Fisnik Rushiti, Dipl.Eng.Arch.
Dear All,
In a project to be LEED certified, we have the following areas:
10400 m2 retail and restaurant
11000 m2 residential (multifamily)
12000 m2 underground car parking
In selecting the baseline HVAC system, would this be considered a
RESIDENTIAL or NONRESIDENTIAL building type? What is the criteria for
selection?
Thank you,
Omer Moltay
Omar,
you have to use predominant condition to determine the system type for
entire building, refer to ASHRAE (as highlighted) provided:
Fisnik Rushiti, Dipl.Eng.Arch.
Dear All,
In a project to be LEED certified, we have the following areas:
10400 m2 retail and restaurant
11000 m2 residential (multifamily)
12000 m2 underground car parking
In selecting the baseline HVAC system, would this be considered a
RESIDENTIAL or NONRESIDENTIAL building type? What is the criteria for
selection?
Thank you,
Omer Moltay
I could be wrong, but I had always understood that you typically did not consider the parking structure when making this determination, so residential would be the predominant condition for this specific case. Also note exception "a" to G3.1.1 - you would use different system types for the non-residential and residential in this case since both are over the 20,000SF (~2,000 SM rough conversion) size limit under that exception. Parking would be considered unconditioned or semi-conditioned depending on the BTU/h for heating and climate zone (see the definitions in Section 3 of ASHRAE 90.1) unless you exceed the heating for a semi-conditioned space, which would then make the garage part of your conditioned floor area (not very common but I did see it happen once) and your predominant space type would be non-residential.
Jeremy R. Poling, PE, LEED AP+BDC