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The project is built on a site with existing exterior lighting installed. How should this be accounted for?

Can mezzanines open to floors below be excluded from the energy model?

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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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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Service Hot Water Efficiency Proposed vs. Baseline

Paul Bohres

First Coast Consulting Engineers

LEEDuser Basic Member

7 thumbs up

February 22, 2011

How do you account for the difference in service hot water efficiency from the proposed design to the baseline design if the proposed design is using electric point-of-use water heaters? Is there a baseline efficiency?

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David Hubka

Director of Operations

Transwestern Sustainability Services

LEEDuser Basic Member

355 thumbs up

Wed, 02/23/2011 - 18:56

Baseline service hot water systems must compy with Table 7.8 of ASHREA 90.1. If the proposed system is also electric it should reflect the same energy comsumption / cost as the baseline system. I have been successful in modeling the baseline with the hot water consumption of the baseline plumbing fixtures versus the hot water consumption of the proposed plumbing fixtures. The efficiencies of the water heaters are the same yet the proposed model heats less hot water due to plumbing fixture efficiency improvements.

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