4.2. System efficiency evaluation index
Besides energy consumption, a comprehensive variable,
COPsys, is defined (Eq. (22)) as an integrated index to evaluate
overall operation efficiency of the combining system. It is a
combination of efficiencies of VRF unit, OAP unit and the
reheater. When the reheater is activated, the energy consumption
is much larger, and the overall system efficiency is
penalized by its low efficiency. If there is no reheating, Qreheat
equals to 0.