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  2. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    A large domestic refrigerator stands as tall as a person and may be about one metre (3 ft 3 in) wide with a capacity of 0.6 m 3 (21 cu ft). Refrigerators and freezers may be free standing, or built into a kitchen. The refrigerator allows the modern household to keep food fresh for longer than before.

  3. Sub-Zero (company) - Wikipedia

    en.wikipedia.org/wiki/Sub-Zero_(company)

    It is the only under-counter wine cooler in its class to be able to keep wine as low as 38 °F (3 °C). [citation needed] It has two temperature zones and can be connected to a house alarm. [citation needed] A Sub-Zero refrigerator can weigh as much as 800 pounds (360 kg) and require four delivery people to move the refrigerator unit into a ...

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  5. Auto-defrost - Wikipedia

    en.wikipedia.org/wiki/Auto-defrost

    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 ...

  6. Heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Heat_exchanger

    In counter-flow heat exchangers the fluids enter the exchanger from opposite ends. The counter current design is the most efficient, in that it can transfer the most heat from the heat (transfer) medium per unit mass due to the fact that the average temperature difference along any unit length is higher. See countercurrent exchange.

  7. Thermal efficiency - Wikipedia

    en.wikipedia.org/wiki/Thermal_efficiency

    This means that 30% of the energy is lost to the environment. An electric resistance heater has a thermal efficiency close to 100%. [ 8 ] When comparing heating units, such as a highly efficient electric resistance heater to an 80% efficient natural gas-fuelled furnace, an economic analysis is needed to determine the most cost-effective choice.

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