Certified Energy Manager Practice Exam

The Energy Efficient Ratio (EER) is a measure used to evaluate the energy efficiency of air conditioning systems, indicating the ratio of cooling capacity to energy usage. The correct calculation for EER takes the form of BTUs per hour divided by the power input in watts. When calculating EER, the formula essentially expresses the amount of cooling produced (in BTUs) against the energy consumed (in watts). The conversion factor of 12,000 comes into play because 12,000 BTUs is equivalent to one ton of cooling. This standard is commonly used in the HVAC industry. In the context of the provided option, multiplying the number of tons by 12,000 converts it into BTUs, while dividing by watts gives a measure of BTUs per watt. Thus, rearranging the components of this formula reflects the proper calculation of the EER, resulting in a unit that expresses the cooling efficiency. This emphasizes the relationship between energy consumption and cooling output, which is vital for assessing the performance of HVAC equipment. The other provided options do not correctly represent the components and relationships necessary to accurately calculate the EER. Understanding this concept is crucial for energy managers and professionals when evaluating the efficiency of HVAC systems and making informed decisions about energy use and sustainability