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

Submetering for AHUs with multiple tanents

We have an hi-rise office building with Chiller and AHUs system. We plan to 3 AHUs per floor. 1. My understanding is that we need to provided "only the central system" which allow tanant submetering. Tenant can themselve install the meter (via leasing agreement). Am I correct? 2. What about cooling energy from the chillers? Is it OK to just write the method to estimate cooling energy using floor area and time of operation of each tanants. If we do not monitor this cooling component, it seems that we do not cover all "eletric" components although the cooling enegry will be reflect usage at chiller plants. 3. If we intent to go for EA5.1 as well, does it meet that we have to write M&V plan for 5.1 to cover all endyuse associate by tenants, particularly light and appliance load?

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Marcus Sheffer
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7group / Energy Opportunities
LEEDuser Expert
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Tue, 03/25/2014 - 15:29

1. yes 2. Only electricity is required to be metered (see page 322 in the Reference Guide). 3. Yes the M&V Plan under EAc5.1 must address the whole building energy use. You are calibrating the model you created for EAp2 which includes the whole building energy use.

Tue, 03/25/2014 - 15:42

Thanks Marcus For item#2, chiller also consume electricity and send the chilled water to the tenant space. Based on what you replied, is it mean that chiller energy for tenant space does not require to proportionally submeter for each tanant to satisfy EA5.2?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 03/25/2014 - 16:16

Correct, no need to meter chilled water or the electricity it consumes for EAc5.2.

Wed, 03/26/2014 - 06:25

Thanks but if we decide to go for only EAc5.2 not EAc5.1, do we need M&V plan or just narrative explain the capability of main system for tenant submetering?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 03/26/2014 - 13:00

They call it a M&V Plan in the credit language but this is not the same as the M&V Plan required for EAc5.1. Many folks assume that the Plan is the same for EAc5.1 and EAc5.2. The documentation requirements are spelled out in the credit form. It is essentially a narrative usually backed up with some information on the metering system installed.

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