Source Versus End Use Efficiency

Equipment performance rating standards are based on end-use efficiency. To establish a basis of comparison for overall thermodynamic performance (and environmental impact), it is necessary to understand the relationship between end-use and source thermodynamic efficiency as it applies to performance rating of cooling and refrigeration systems.

Electric-driven equipment typically exhibits COPs that are 2 to 4 times greater than comparable fuel- or heat-driven equipment. However, to calculate the actual fuel-related, or source energy COP, of an electric-driven unit, the efficiency of the electric generation and transmission and distribution (T&D) processes must be considered. As a starting point, the relationship between end-use COP and EER (Btu/watt-h) was previously derived and shown in Equation 33-12 as:

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

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