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  2. Air source heat pump - Wikipedia

    en.wikipedia.org/wiki/Air_source_heat_pump

    A COP of 4 means the heat pump produces 4 units of heat energy for every 1 unit of electricity it consumes. Within temperature ranges of −3 °C (27 °F) to 10 °C (50 °F), the COP for many machines is fairly stable. Approximately TheoreticalMaxCOP = (desiredIndoorTempC + 273) ÷ (desiredIndoorTempC - outsideTempC).

  3. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    An international milestone is the heat pump built by Escher Wyss in 1937/38 to replace the wood stoves in the City Hall of Zurich. To avoid noise and vibrations, a recently developed rotary piston compressor was used. This historic heat pump heated the town hall for 63 years until 2001. Only then was it replaced by a new, more efficient heat ...

  4. Ground source heat pump - Wikipedia

    en.wikipedia.org/wiki/Ground_source_heat_pump

    A heat pump in combination with heat and cold storage. A ground source heat pump (also geothermal heat pump) is a heating/cooling system for buildings that use a type of heat pump to transfer heat to or from the ground, taking advantage of the relative constancy of temperatures of the earth through the seasons.

  5. 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]

  6. Don't wait until Black Friday: Amazon deals dropped ... - AOL

    www.aol.com/lifestyle/amazon-early-black-friday...

    This set comes with a steamer and wooden spatula, all for just $95 during Black Friday. $95 at Amazon. ... DEWALT 20V MAX Cordless Drill and Impact Driver. $129 $239 Save $110. See at Amazon.

  7. DeWalt - Wikipedia

    en.wikipedia.org/wiki/DeWalt

    DeWalt is now a popular brand of tools for commercial contractors. In 2004, Black and Decker bought rival power tool manufacturer Porter-Cable and combined it with DeWalt in Jackson, Tennessee. [3] In 2011, DeWalt launched a line of contractors' hand tools (including utility knives, pliers, adjustable wrenches, tape measures, saws, and hammers ...

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