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:

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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