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Tier 1 refrigerators are those that are 20% to 24.9% more efficient than the Federal minimum standards set by the National Appliance Energy Conservation Act (NAECA). Tier 2 are those that are 25% to 29.9% more efficient. Tier 3 is the highest qualification, for those refrigerators that are at least 30% more efficient than Federal standards. [42]
Systems that operate at higher pressures tend to be more efficient, and compressors used in subcooling loops are generally more efficient than those that cool the liquid refrigerant directly. Modern economizer-capable screw compressors are being developed, [9] requiring advanced manufacturing techniques. These compressors can inject refrigerant ...
The same device used between the same temperatures is more efficient when considered as a heat pump than when considered as a refrigerator since C O P h e a t i n g = C O P c o o l i n g + 1 {\displaystyle \mathrm {COP} _{\mathrm {heating} }=\mathrm {COP} _{\mathrm {cooling} }+1}
Note that a Carnot engine is the most efficient heat engine possible, but not the most efficient device for creating work. Fuel cells, for instance, can theoretically reach much higher efficiencies than a Carnot engine; their energy source is not thermal energy and so their exergy efficiency does not compare them to a Carnot engine. [1] [2]
While this technique was originally applied to the refrigerator compartment, it was later used for freezer compartment as well. A combined refrigerator/freezer which applies self-defrosting to the refrigerator compartment only is usually called "partial frost free" or semi-automatic defrost (some brands call these "Auto Defrost" while Frigidaire referred to their semi-automatic models as ...
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