Question about CM_AC_URB3D calculation

[Wang Zhikai]

Dear all WRF users,

I have a question regarding the WRF output variable CM_AC_URB3D, which is described as "CONSUMPTION OF THE AIR COND" in the Registry.EM_COMMON.

The unit for this variable is given as "W m⁻²". I would like to confirm how this area-averaged value is calculated. Specifically, does this value represent:

1. The air conditioning energy consumption averaged over the entire grid cell area?
2. Or, is it the energy consumption averaged only over the building footprint area within that grid cell?

Furthermore, it would be very grateful if someone could explain the calculation methodology for this value.

Best regards,
Zhikai