Dear all,
I am attempting LEED 2009 CS, EA Cr 5.1 & Cr 5.2.
My project is 4 multi-storey commercial buildings, whereby a different tenant occupies each floor of a building.
1) When considering Fans, do we need to install 1 submeter for all fans of the building, or 1 submeter per fan (meaning 1 submeter per tenant) ?
2) We have primary and secondary pumps. Should we submeter both types of pumps together, or submeter each separately?
3) There is a meter for "IT and small equipment", a meter for "fans", a meter for "pumps", and a meter for "total electricity consumption". The remaining category is the HVAC. Do we need to install a dedicated submeter for the HVAC, or are we allowed to subtract the IT, fans, and pumps consumption from the "Total electricity consumption", to get the remaining HVAC consumption?
Many thanks!
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
August 25, 2010 - 7:58 am
5.2 is satisfied by submetering each tenant space independently.
For 5.1, you really need to start with your M&V plan. First decide which IPMVP path you are following. The answer to questions 1&2 above depend on the M&V plan you develop. If the fans are AHU fans, one per tenant, then typically they would be metered individually. I would probably not meter each pump, but would instead trend data from the pump VFDs through the BAS.
For question 3, it is certainly appropriate to calculate some end uses, rather than metering them directly. If you've metered the total, and everything but "x", you know "x" as well.
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
August 25, 2010 - 8:01 am
Actually, you could also gather data for each AHU in the manner I described for the pumps. But for utility consumption accountability, you probably want AHUs serving a single tenant on the tenant electric meter.
Maya Karkour
EcoConsulting872 thumbs up
August 25, 2010 - 9:30 am
Thanks Christopher!
I am using Option B: Energy Conservation Measure Isolation.
I understand from you that every AHU Fan is to be metered alone.
Regarding the pumps, if I want to install submeters (and not trend data through the BAS), should I install for each of the primary and secondary pumps?
Many thanks!
Christopher Schaffner
CEO & FounderThe Green Engineer
LEEDuser Expert
963 thumbs up
August 25, 2010 - 9:36 am
If this is new construction and/or the ECMS implemented are interactive, Option B may not be appropriate. Under Option B, you need to meter the ECMs you have implemented.
To your specific question, I'm struggling to understand what you'd learn by metering the pumps individually.
Again, first develop the M&V plan. Design the metering per the plan.