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  2. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    Food in a refrigerator with its door open. A refrigerator, commonly shortened to 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 temperature. [1]

  3. Direct cool - Wikipedia

    en.wikipedia.org/wiki/Direct_cool

    Direct cool is one of the two major types of techniques used in domestic refrigerators, the other being the "frost-free" type. Direct-cool refrigerators produce the cooling effect by a natural convection process from cooled surfaces in the insulated compartment that is being cooled. Water vapor that contacts the cooled surface freezes.

  4. Energy Star - Wikipedia

    en.wikipedia.org/wiki/Energy_Star

    Energy Star (trademarked ENERGY STAR) is an energy-efficiency program administered by the U.S. Environmental Protection Agency (EPA) in partnership with the U.S. Department of Energy (DOE). [ 2 ] [ 3 ] [ 4 ] The EPA establishes energy efficiency specifications, and those that meet these specifications are eligible to display the ENERGY STAR logo.

  5. ULT freezer - Wikipedia

    en.wikipedia.org/wiki/ULT_freezer

    The pull down time is defined as the necessary time to cool down the ULT freezer from ambient temperatures to the selected temperature of −80 to −86 °C (−112 to −123 °F). The time strongly depends on the type of insulation, the efficiency of the compressor system as well as the installed metal shelves within the freezer.

  6. Quantum heat engines and refrigerators - Wikipedia

    en.wikipedia.org/wiki/Quantum_heat_engines_and...

    Non thermal fuels have been considered for quantum heat engines. The idea is to increase the energy content of the hot bath without increasing its entropy. This can be achieved by employing coherence [30] or a squeezed thermal bath. [31] These devices do not violate the second law of thermodynamics.

  7. Coefficient of performance - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_performance

    A realistic indication of energy efficiency over an entire year can be achieved by using seasonal COP or seasonal coefficient of performance (SCOP) for heat. Seasonal energy efficiency ratio (SEER) is mostly used for air conditioning. SCOP is a new methodology which gives a better indication of expected real-life performance of heat pump ...