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NC-2009 EAp2:Minimum Energy Performance

Ventilation as Process Load

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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
79 thumbs up

Hi! I'm currently working on a project regarding an office building. This office has several areas served by ventilators (exhaust and supply) that are not interlocked with the HVAC system (WC's, mechanical areas (water deposits, ex..)). My doubt is how should I account for the energy consumption of these equipments. 1_ Am I right to assume that these are process loads? 2_ Am I right to assume that they should equally be accounted in both the Proposed and in the Baseline? 3_ How do I account for the specific fan power for these cases? (I think that it should be as designed) Please advise! Thank you in advance!

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Santiago Velez
ASHRAE BEMP HBDP - LEED GA, Building Performance Consultant
Zonda
LEEDuser Basic Member
14 thumbs up

Mon, 09/19/2016 - 14:02

Hi, Pedro, 1. Yes. These are not part of your system fan power. Although I wouldn´t call them "Process loads". 2. Yes. 3. Yes. As designed for both baseline and proposed.
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Santiago Velez
ASHRAE BEMP HBDP - LEED GA, Building Performance Consultant
Zonda
LEEDuser Basic Member
14 thumbs up

Mon, 09/19/2016 - 14:08

You should model them and clearly identify them in the input spreadsheet. In "Section 1 4 Tables (Jan 2014).xlsx", int he airside HVAC section, you can find the following text: "Report exhaust fans not interlocked with HVAC operation (such as parking garage ventilation fans, or unconditioned electrical room exhaust fans), and exhaust fans not required in the calculations (such as fume hoods applying Exception 6.5.3.1.1, or kitchen hoods operating independently of the building HVAC system) in Table 1.4.4" These fan should be reported in the "Equipment" section. Best, Santiago.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 09/19/2016 - 14:09

LEED refers to any energy load that is not regulated by 90.1 as a process load. I agree, three yeses.
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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
79 thumbs up

Mon, 09/19/2016 - 16:24

Thank you for your promt response, Marcus and Santiago!

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