Submetering - Core & Shell 2009

As I describe in the 2009 CI EAc3 M&V thread on this forum (see response to Julian Bott's inquiry), the CI EAc3 language has a number of problems. To reiterate: Rather than reusing/rehashing the NC 2.0/2.1 language Case 2 should have adapted the 2009 BD&C EAc5 language (also used for NC 2.2). It cites IPMVP Vol. III with specific guidance for the available options (Option C makes little sense for CI) and dispenses with the arguably flawed "old" list of prescriptive requirements. Instead, Vol. III inherently provides the necessary flexibility and discretion to deal with projects, including CI, on an individual basis. The USGBC is aware of these problems and this posting will prompt me to follow up to see if any resolution has been reached regarding a correction. In terms of immediate advice, I suggest following the 2009 BD&C EAc5 language (using IPMVP Vol. III) and adapting it accordingly for CI. I can also confirm that the CI RG requirement for IPMVP compliance for Case 1 is also an error. Regarding your second question: Case 1 of CI EAc3 requires metering only at the tenant level, not submetering of end-uses/systems as required by Case 2 (notwithstanding the flaws in the Case 2 language as described above). In most cases this will mean total electrical usage for the tenant space as well as total natural gas, steam, or hot water as the case may be.

For LEED-CS 2009 EAc5.2, tenant submetering, should electrical usage monitor include HVAC electrical usgage? I mean most office building charge the heating & cooling electrical usage in their estate managing fees.

To some extent it depends on whether the future CI will fall into Case 1 or 2. If it's Case 1, then a single electrical meter for the tenant will suffice, with all electrical loads specific to the tenant being recorded by that meter. If it's Case 2, then individual electrical end-uses need to be disagreggated and metered. If the HVAC for the Case 2 tenant is provided by a central system, then it's a base building, not CI issue. However, if the CI has tenant-specific HVAC terminals that draw electricity (e.g. heat pumps), then those have to be specifically metered. Having said all of this, CS EAc5.2 only requires that the base building install the "backbone" of the metering system, not the tenant metering and/or submetering itself. In reality, differentiating between Case 1 and Case 2 future CIs is not going to make much difference to the design of the central metering backbone.