Final answer:
The enlisted performance reports (EPR) conversion factor relates to the inverse of electrical conversion efficiency, with an efficiency of 34% leading to a factor of approximately 2.94, and the latest EIA efficiency of 37.5% gives a conversion factor of 2.67.
Step-by-step explanation:
The enlisted performance reports (EPR) conversion factor is a numerical value used to convert a unit of energy efficiency into another.
This conversion factor is essentially the inverse of the electrical conversion efficiency. For instance, if the electrical conversion efficiency is 34%, the corresponding conversion factor would be 1/0.34, or approximately 2.94. The Energy Information Administration (EIA) gradually increased this efficiency rate and as per the latest figures reported, an efficiency of 37.5% would have a conversion factor of 2.67. Similar conversions are seen in other efficiency metrics, such as the Energy Efficiency Ratio (EER) and the Heating Seasonal Performance Factor (HSPF), where different units lead to different factors, like 1/0.293 which equates to 3.41.