I am modeling an all-electric building. My baseline building is a system 8 PFP VAV with chillers and electric resistance heat.
We are considering adding natural gas water heaters for high dishwasher and shower loads. It does not seem like this should change the building to an electric/hybrid with the baseline system changing to system 7 with a hot-water gas boiler as the architect has suggested. The proposed HVAC heating source is still 100% electric.
Has anyone dealt with this heating source question? What was the resolution?
Thanks in advance,
Rick
R I C H A R D E L L I S O N
BEAP, BEP, BEMP, BESA, CBEP, CDSM, CEA,
CEM, CMVP, CTAB, DGCP, HBDP, LEED AP, PE
Manager of Energy and Simulation
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Hi Richard,
My take is that the system type selections are based on the HVAC heating
energy source and are not dependent on the water heating source. If the
proposed HVAC system is all electric then System 8 seems to be the correct
choice.
For the water heating, the fuel source must be the same for baseline and
proposed.
However, if the building now has a gas supply, the design team may want to
evaluate the feasibility of a gas (HVAC) heating system.
Regards,
Jeff Ross-Bain, PE, LEED AP BD+C, BEMP
Principal
404-220-8940 Office
404-220-8955 Direct
www.rbgb.com
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