How to sum the zone output:variable in energyPlus
I have a CHP case, and I want to track the electric consumption excluded each apartment, so in Meter:CustomDecrement I exclude each apartment zone electric meter (such as:Electricity:Zone:1-LOFT ZN). however, I notice that these kind of electric meter don't include its HVAC (PTPH in each apartment). From rdd and mdd file, I only can find Zone Package Terminal Heat Pump Electric Energy, but it is a variable which have each zone PTHP result, rather than sum.
So I just wonder is there have any method to get the electric energy of all PTHP in output:variable or output:meter. So I can exclude it from total electric consumption (Electricity:Facility)