I am getting confused about the meaning of compressor capacity. Sometimes I see it equated to evap capacity, is that for an ideal system? Can this value be used to calculate mass flow by using the enthalpy states into and out of the evaporator?

I know that Qin (evap load) + compressor Win (comp power) = Qout (cond heat of rejection); but where does compressor capacity fit in the picture?

Thanks for the help, Kate