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CS-2009 EAc5.2:Measurement and Verification—Tenant Submetering

Combined metering for plug loads and lighting

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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

I am having lots of trouble with design teams in getting them to seperate internal lighting circuitry from plug loads. Question: Since ASHRAE 90.1 baseline plug loads energy use is identical to the proposed use, couldnt they be metered together for the M&V plan? Solely the lighting in the energy model would be calibrated with the difference.

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

Wed, 10/23/2013 - 21:14

The need to separate lighting and plug load for this credit has always baffled me. That table in the Reference Guide is the only place it is mentioned. Has anyone checked the addenda, interpretation, etc. to see if this has been changed?
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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Thu, 10/24/2013 - 20:56

Marcus, can you elaborate further on why it baffles you? How would the calibration of the ASHRAE baseline be affected by measuring lighting together with plug loads? I'm attempting to justify this point in a design review response. Thanks
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 10/24/2013 - 21:35

EAc5.1 is the one in CS where you calibrate models and do a M&V Plan. For EAc5.2 it is just about submetering tenant energy use by fuel. The whole idea is to encourage tenants to pay for their own energy usage. As a tenant if you pay for it you do not ignore it and might be encouraged to do something about it. If the landlord pays for it then the tenant has no incentive to conserve or be energy efficient. So it makes no sense to me that you have to separate lighting and plug loads when the point of this particular part of this credit is tenant submetering by energy type not energy end use..
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Rudolph Carneiro
HVAC consultant
Optimized Systems
LEEDuser Basic Member
19 thumbs up

Thu, 10/24/2013 - 23:28

Your right. I'll ask the question in the eac5.1 forum.

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