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2. Coefficient of performance - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_performance

   The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. [ 1 ] [ 2 ] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.

3. 10 Easy Ways to Make Your Refrigerator More Efficient - AOL

   www.aol.com/finance/10-easy-ways-refrigerator...

   This certification is backed by the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Energy (DOE) as a leading contender for energy efficiency. ENERGY STAR states that you ...

4. Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Refrigerator

   In the early 1990s a competition was held among the major US manufacturers to encourage energy efficiency. [39] Current US models that are Energy Star qualified use 50% less energy than the average 1974 model used. [40] The most energy-efficient unit made in the US consumes about half a kilowatt-hour per day (equivalent to 20 W continuously). [41]

5. Thermal efficiency - Wikipedia

   en.wikipedia.org/wiki/Thermal_efficiency

   For a heat engine, thermal efficiency is the ratio of the net work output to the heat input; in the case of a heat pump, thermal efficiency (known as the coefficient of performance or COP) is the ratio of net heat output (for heating), or the net heat removed (for cooling) to the energy input (external work). The efficiency of a heat engine is ...

6. European Union energy label - Wikipedia

   en.wikipedia.org/wiki/European_Union_energy_label

   For refrigerating appliances, such as refrigerators, freezers, wine-storage appliances, and combined appliances, the labelling is specified in terms of an energy efficiency index EEI, which is an indication of the annual power consumption relative to a reference consumption that is based on the storage volume and the type of appliance (refrigerator or freezer).

7. Refrigeration - Wikipedia

   en.wikipedia.org/wiki/Refrigeration

   In 1927, GE released the Monitor Top, the first refrigerator to run on electricity. [35] In 1930, Frigidaire, ... for the energy efficiency performance rating. ...