How is the Energy Efficiency Ratio (EER) calculated?

• A. By dividing the mass flow of refrigerant by the heat removal rate
• B. By multiplying the cooling capacity by the power input
• C. By dividing the cooling capacity in kW by the power input in kW
• D. By measuring the temperature difference in the evaporator

Answer: (C)

The Energy Efficiency Ratio (EER) is calculated by dividing the cooling capacity of an air conditioning system, expressed in kilowatts (kW), by the electrical power input also measured in kilowatts (kW). This ratio provides an indication of how efficiently a cooling system operates; a higher EER indicates better energy efficiency. The formula reflects the relationship between the output (cooling capacity) and input (energy consumption), thus helping to assess the performance of refrigeration and air conditioning systems in terms of energy usage.

This understanding is crucial, particularly for compliance with energy regulations and for selecting systems that operate sustainably and economically. The EER helps consumers and professionals alike make informed decisions about the efficiency of cooling systems.