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  2. Water-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Water-tube_boiler

    A high pressure watertube boiler [1] (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by fire. Fuel is burned inside the furnace, creating hot gas which boils water in the steam-generating tubes.

  3. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...

  4. Furnace (central heating) - Wikipedia

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

    A two-stage furnace has to do two stage full speed and half (or reduced) speed. Depending on the demanded heat, they can run at a lower speed most of the time. They can be quieter, move the air at less velocity, and will better keep the desired temperature in the house.

  5. Heating system - Wikipedia

    en.wikipedia.org/wiki/Heating_system

    A heating system is a mechanism for maintaining temperatures at an acceptable level; by using thermal energy within a home, office, or other dwelling. Typically, these systems are a crucial part of an HVAC (Heating, Ventilation, and Air Conditioning) system.

  6. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Most modern hot water boiler heating systems have a circulator, which is a pump, to move hot water through the distribution system (as opposed to older gravity-fed systems). The heat can be transferred to the surrounding air using radiators, hot water coils (hydro-air), or other heat exchangers. The radiators may be mounted on walls or ...

  7. Mystery NJ drones are coming from Iranian mothership ... - AOL

    www.aol.com/mystery-nj-drones-coming-iranian...

    A New Jersey congressman claimed Wednesday that the mystery drones over the Garden State are from Iran, and they’re being launched by a mothership parked off the East Coast.

  8. Gabourey Sidibe's Husband Calls the Actress and Their 7 ... - AOL

    www.aol.com/lifestyle/gabourey-sidibes-husband...

    "The loves of my life," Frankel began the sweet caption. "No matter how tough things get, or how crazy the world becomes, the way you all light up when you see me just warms my heart," he ...

  9. College Football Playoff matchups, bracket, schedule revealed ...

    www.aol.com/college-football-playoff-matchups...

    After much deliberation, the College Football Playoff committee chose SMU over Alabama for the final spot in the 12-team field. See the full schedule.

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