Energy Efficiency Ratio EER !By Imran

Energy Efficiency Ratio EER The Energy Efficiency Ratio - EER - is a term generally used to define cooling energy efficiency of unitary air-conditioning and heat pump system.

The efficiency is determined at a single rated condition specified by an appropriate equipment standard and is defined as the ratio of net cooling capacity - or heat removed in Btu - to the total input rate of electric energy applied - in Wh. The units of EER are Btu/Wh. EER = Qc / E (3) where EER = energy efficient ratio (Btu/Wh) Qc = net cooling energy (Btu) E = applied electrical energy (Wh) This efficiency term typically includes the energy requirement of auxiliary systems such as the indoor and outdoor fans. higher EER - more efficient system Example - EER for an Air Conditioner Unit The heat removed and electrical power consumed for the air conditioner unit can be measured and calculated in different ways. One simple alternative is to calculate mean values from some . The heat removed for 3 hours can be estimated to Qc = ((8500 Btu/h + 10000 Btu/h + 7000 Btu/h) / 3) (3 h) = 25500 Btu The electrical consumption for 3 hours can be estimated to E = ((600 W + 700 W + 550 W) / 3) (3 h) = 1850 Wh EER for the air conditioner unit can be estimated to EER = (25500 Btu) / (1850 Wh) = 13.8 Thanks for read if you want to anything related to HVAC and Mechanical Engineering then comments and subscribe for new update.