Q: I am.saikiran,CEM, from Saudi Arabia. I took AEE CMVP course in last week. In that AEE booklet(Study Material) mentioned options(A,B,C,D) categorized into 2 groups. those are Option A & B ( Retrofit Isolation) and Option C& D (Whole Facility).

As of my experience and sharing knowledge with some energy experts, Option D is Used for both retrofit & whole facility

So can you please clarify, which is correct? and explain more detail please..

A: Yes - Option D can be applied to either a whole facility or to a specific system/retrofit. Both require metering data to calibrate the simulation; either whole facility or submetering for the retrofit system.