All heating/cooling in our building project is supplied by a heat pump, fed from an ATES system that is shared with other buildings on the property. We need a little clarification about what should be metered for the heating and cooling end uses in this situation:
- Should we meter the energy input or output of the heatpumps? So, is it the consumption of the system, or the actual heating/cooling consumed by the building? The example about the RTU in the reference guide seems to suggest we need to measure the input, but we are not very clear if that is just in case of such packaged systems ("A common example is a rooftop unit (RTU), a single packaged piece of equipment that can provide the cooling, heating, and air handling but is cost and space prohibitive to submeter. Therefore, metering the entire RTU (or metering each fuel supplying the RTU, if there is more than one) is an acceptable way to achieve this credit.")
- If we are to meter the input to the heat pump, do we meter both the electrical input and the heat input from the ATES? or is the ATES considered stored energy and we should then meter the input to the ATES?
- If we want to meter the input to the ATES, and it is shared with other buildings, how can we determine the portion that would be attributed to our project?
