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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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NC-2009 EAp2:Minimum Energy Performance

Modeling District Steam in Baseline

We are looking at an existing 300,000 s.f. hotel highrise in a downtown location that is currently on a citywide district steam utility. There are extensive interior architectural changes and a moderate amount of mechanical, so we are pursuing LEED NC. The thought is to install gas-fired boilers within the building, removing it from the (greatly inefficient) district system. Can this be modeled as an Option 1 DES in the baseline case, and an appropriate gas-fired boiler plant in the proposed? "Treatment of District or Campus Thermal Energy in LEED V2" does not seem to address this situation.

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Mon, 04/28/2014 - 18:51

You model HVAC equipment against a code compliant baseline, not existing conditions. So, if your proposed case is not DES, neither is your baseline. You can't take credit for disconnecting from the DES any more than you can take credit for replacing an old piece of equipment. For what it's worth, you'd be penalized for the inefficient district system if you stayed connected to it. So you got that going for you, which is nice.

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