In Energy modeling, there are multiple inputs for efficiency. Typically, this refers to measuring how well an HVAC system uses energy to perform its functions.

The equation to determine efficiency is for the refrigeration cycle measures how much heat is moved divided by how much power is consumed.

Units for efficiency are often measured in COP, EER, KW/ton, HSPF, and SEER. These values are effectively interchangeable (see COP to EER to KW/Ton conversions here and or if using eQUEST and EIR check out this cheat sheet

Energy modelers must account for the components included in the energy consumption. Sometimes, the energy consumed include the entire unit (the supply fan, the condenser fans, and the compressor). Often, the energy consumed is the compressor only.

When an energy modeler enters the plant efficiency, it is essential to determine the values included in the efficiency so that those values are not counted twice.

For example, if the value includes the compressor and the condenser fans, don't add a separate KW value for condenser fans.

If possible, it is most accurate to obtain the compressor only energy efficiency, and then enter the supply fans and condenser fans separately