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  2. 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. [1] 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. [2]

  3. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    A heat pump is a device that uses electricity to transfer heat from a colder place to a warmer place. Specifically, ... 6.1 5.4 4.8 Carbon footprint

  4. Seasonal energy efficiency ratio - Wikipedia

    en.wikipedia.org/wiki/Seasonal_energy_efficiency...

    In the United States, the efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute, a trade association, in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [1]

  5. Transbay Tube - Wikipedia

    en.wikipedia.org/wiki/Transbay_Tube

    A vehicle was custom-built to handle the 4-short-ton (3.6 t), 2.5-inch (64 mm) thick plates; once hoisted in place, the plates were bolted to the existing concrete walls and welded together, end-to-end. [56] The contract for US$7,735,000 (equivalent to $10,265,000 in 2023) was awarded to California Engineering Contractors for installation. [57]

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