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2. Refrigerator - Wikipedia

   en.wikipedia.org/wiki/Refrigerator

   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]

3. Subcooling - Wikipedia

   en.wikipedia.org/wiki/Subcooling

   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 ...

4. Coefficient of performance - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_performance

   The COP of absorption chillers can be improved by adding a second or third stage. Double and triple effect chillers are significantly more efficient than single effect chillers, and can surpass a COP of 1. They require higher pressure and higher temperature steam, but this is still a relatively small 10 pounds of steam per hour per ton of cooling.

5. Natural refrigerant - Wikipedia

   en.wikipedia.org/wiki/Natural_refrigerant

   The range of flammability for hydrocarbons lie between 1 and 10%, and an ignition source must have an energy greater than 0.25 J or a temperature greater than 440 °C. [15] Current safety measures regarding the usage of hydrocarbons are outlined by the Environmental Protection Agency (EPA). EPA guidelines of hydrocarbon usage as a refrigerant ...

6. Condenser (heat transfer) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(heat_transfer)

   This also increases the surface area. There is a motorized fan inside the condenser unit near the top, which is covered by some grating to keep any objects from accidentally falling inside on the fan. The fan is used to pull outside cooling air in through the heat exchanger section at the sides and blow it out the top through the grating.

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