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NC-2009 EAp2:Minimum Energy Performance

Type and Number of Boilers

In the building that I’m modelling there are two floors. On the ground floor the conditioned area is 3393m^2 and on the first floor it is 2689m^2. The baseline system shall be System 5 – Packaged rooftop VAV with reheat. G3.1.1 states “each floor shall be modelled with a separate HVAC system”. Therefore I have to model a hot water loop for the ground floor and a hot water loop for the first floor. G3.1.3.2 states “The baseline building design boiler plant shall be modelled (..) as having two equally sized boilers for plants serving more than 1400m^2”. Does it mean that I have to model two HW loops (one for the ground floor and one for the first floor) and in every loop two boilers in parallel (i.e. considering the whole building four boilers)? With Regards

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 08/02/2013 - 14:30

You only need an air side system per floor. You would model a central boiler plant with a single secondary loop serving each of the systems.

Fri, 08/02/2013 - 15:04

The surface is more than 1400 m^2. Shall I model two boilers, in parallel in the same HW loop (for the whole building one HW loop and two boilers)? On the demand side, I would connect the water coils in parallel.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 08/02/2013 - 15:52

Yep two equally sized boilers (G3.1.3.2) with a single primary HW loop (G3.1.3.5).

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