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We are proposing to metering a new building with a single controller. The controller has the capability to monitor each individual end use (lighting, plug loads, HVAC, water, gas, etc.). Can we meter everything on a distribution board except one specific

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NC-v4 EAc3:Advanced energy metering

Using EMS to calculate some End-Use Energy

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Melissa Crowe
Sr Energy Engineer
CMTA Inc
LEEDuser Basic Member
1 thumbs up

Hi All

We have metering set up for most of the end-uses that represent over 10% of total energy but for some equipment is it not cost effective or practical.

  1. Can we use calculated energy from EMS trends to satisfy the credit requirements?  For example: the EMS can record Fan VFD parameter points (i.e. Amps) that through programming calculations are converted to fan kWh energy.
  2. Does 100% of all energy of an end-use category need to be metered? What if some small fraction is missed. eg. Cooling for a building with over 100 tons of cooling is an over 10% energy end-use ; will we miss the credit if we do not meter one ½ ton DX AC unit?

Thank you

Melissa

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

Thu, 10/31/2019 - 19:47

1. I would think that you could justify this. Technically it is not an advanced meter and it requires some additional steps to determine energy use so I would look through the Reference Guide and the Interpretations to see if this has been addressed. 2. Put the DX unit on a separate meter in the model and it becomes a separate end use. Makes no sense to disqualify over such a small cooling use.
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Melissa Crowe
Sr Energy Engineer
CMTA Inc
LEEDuser Basic Member
1 thumbs up

Thu, 10/31/2019 - 20:03

Thank you Marcus.  I particularly like the "work around" answer to #2. Melissa

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