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  2. Auto-defrost - Wikipedia

    en.wikipedia.org/wiki/Auto-defrost

    A defrost timer taken out of a household refrigerator. The defrost mechanism in a refrigerator heats the cooling element (evaporator coil) for a short period of time and melts the frost that has formed on it. [1] The resulting water drains through a duct at the back of the unit. Defrosting is controlled by an electric or electronic timer.

  3. Minimum efficiency reporting value - Wikipedia

    en.wikipedia.org/wiki/Minimum_Efficiency...

    Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers ( ASHRAE) to report the effectiveness of air filters in more detail than other ratings. For example, often a high-efficiency particulate air ( HEPA) filter is ...

  4. Vapor-compression refrigeration - Wikipedia

    en.wikipedia.org/wiki/Vapor-compression...

    Vapour-compression refrigeration or vapor-compression refrigeration system ( VCRS ), [ 1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles. It is also used in domestic and commercial refrigerators, large-scale warehouses ...

  5. Electrical equipment in hazardous areas - Wikipedia

    en.wikipedia.org/wiki/Electrical_equipment_in...

    Enclosures can be pressurized with clean air or inert gas, displacing any hazardous substance. Arc-producing elements can be isolated from the atmosphere, by encapsulation in resin, immersion in oil, or similar. Heat-producing elements can be designed to limit their maximum temperature below the autoignition temperature of the material involved.

  6. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    Globally. Food in a refrigerator with its door open. A refrigerator, commonly fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room ...

  7. Automotive air conditioning - Wikipedia

    en.wikipedia.org/wiki/Automotive_air_conditioning

    R-12, the first automotive air conditioning refrigerant, was invented in 1928 by a team of scientists put together by Thomas Midgley, Jr. The team of scientists set out to create refrigerants which led to the invention of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). From these two inventions, two refrigerants were created, R ...

  8. Heat pump and refrigeration cycle - Wikipedia

    en.wikipedia.org/wiki/Heat_pump_and...

    Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [ 1]

  9. Cascade refrigeration - Wikipedia

    en.wikipedia.org/wiki/Cascade_refrigeration

    Cascade refrigeration. A cascade refrigeration cycle is a multi-stage thermodynamic cycle. An example two-stage process is shown at right. (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers. [1] In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used.

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