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  2. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    These furnaces were still big and bulky compared to modern furnaces, and had heavy-steel exteriors with bolt-on removable panels. Energy efficiency would range anywhere from just over 50% to upward of 65% AFUE. This style furnace still used large, masonry or brick chimneys for flues and was eventually designed to accommodate air-conditioning ...

  3. Annual fuel utilization efficiency - Wikipedia

    en.wikipedia.org/wiki/Annual_fuel_utilization...

    The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...

  4. Reversing valve - Wikipedia

    en.wikipedia.org/wiki/Reversing_valve

    Reversing valves are built into the heat pump by the manufacturer, and must be replaced by an HVAC technician if they fail. Since the valve is an integral part of the sealed refrigerant circuit, proper procedures for recovering and then later refilling the refrigerant must be followed, to prevent its loss into the atmosphere.

  5. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    The system normally has eight main components: a compressor, a reservoir, a reversing valve which selects between heating and cooling mode, two thermal expansion valves (one used when in heating mode and the other when used in cooling mode) and two heat exchangers, one associated with the external heat source/sink and the other with the ...

  6. Zone valve - Wikipedia

    en.wikipedia.org/wiki/Zone_valve

    In this way, applying power to the "open valve" terminal causes the motor to run until the valve is open while applying power at the "close valve" terminal causes the motor to run until the valve is closed. The motor is commonly powered from the same 24 volt ac power source that is used for the rest of the control system.

  7. Amazon hits $2 trillion in valuation on AI fervor, rate cut bets

    www.aol.com/news/amazon-hits-2-trillion...

    The stock rose 3.4% to $192.70, giving the e-commerce giant a market value of over $2 trillion and putting it in the same club as technology heavyweights Microsoft Corp, Apple Inc, Nvidia Corp and ...

  8. Automatic bleeding valve - Wikipedia

    en.wikipedia.org/wiki/Automatic_bleeding_valve

    Brass-bodied float valve. An automatic bleeding valve or air release valve (ARV) is a plumbing valve used to automatically release trapped air from a heating system. Air, or other gas, may collect within plumbing. For water delivery systems to taps and basins, particularly with good main supply pressure, this air is usually flushed through with ...

  9. The viral Avia sneakers are finally back in stock at ... - AOL

    www.aol.com/lifestyle/the-viral-avia-sneakers...

    And we've got just the pair: Avia 5000 Performance Sneakers. These viral bestselling sneakers have taken TikTok by storm, and Walmart shoppers can't stop raving about their supreme comfort, either.

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