1. EAC is the coefficient converted from the mechanical efficiency values COPi of the chiller, pump, fan, and cooling tower, as well as the efficiency values ?i of the 11 air conditioning energy-saving control technologies shown in Table 5. Its calculation formulas are shown in Equations 2-8. EAC represents the overall energy-saving efficiency of the air conditioning system. For example, when EAC=0.5, it means 50% air conditioning energy saving. The main components of the EAC formula in Equation 2 are the total efficiency ACE of the air conditioning mechanical equipment, namely? the chiller, fan system (including supply fans, return fans, exhaust fans, etc.), and pump system (including chilled water and cooling water systems), as well as the total efficiency R composed of 11 energy-saving control systems. However, BERS requires that R must not exceed 0.3 to ensure the total efficiency of mechanical equipment (ACE). The mechanical efficiency values in the EAC calculation formula are all calculated according to relevant ANSI/ASHRAE/IES Standard 90.1, and the related COPi benchmark values must comply with the relevant regulations of the Energy Administration;Air Conditioning Energy-saving Efficiency (EAC) BERSn adopts EAC as the parameter for air conditioning energy efficiency assessment