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  2. Fan heater - Wikipedia

    en.wikipedia.org/wiki/Fan_heater

    Electric fan heater. A fan heater, also called a blow heater, is a heater that works by using a fan to pass air over a heat source (e.g. a heating element). [1] This heats up the air, which then leaves the heater, warming up the surrounding room. They can heat an enclosed space such as a room faster than a heater without a fan, [2] but like any ...

  3. Specific fan power - Wikipedia

    en.wikipedia.org/wiki/Specific_fan_power

    In reality the fan system efficiency is often in the range 0 to 60% (i.e. <); it is lowest for small fans or inefficient operating points (e.g. throttled flow or free-flow). The efficiency is a function of the total losses in the fan system, including aerodynamic losses in the fan, friction losses in the drive (e.g. belt), losses in the ...

  4. Mains electricity - Wikipedia

    en.wikipedia.org/wiki/Mains_electricity

    A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V The world's first public electricity supply was a water wheel driven system constructed in the small English town of Godalming in 1881. It was an alternating current (AC) system using a Siemens alternator supplying power for both street lights and consumers at two voltages, 250 V for ...

  5. Cooling capacity - Wikipedia

    en.wikipedia.org/wiki/Cooling_capacity

    Cooling capacity is the measure of a cooling system's ability to remove heat. [1] It is equivalent to the heat supplied to the evaporator/boiler part of the refrigeration cycle and may be called the "rate of refrigeration" or "refrigeration capacity".

  6. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    A fan coil unit (FCU), also known as a Vertical Fan Coil Unit (VFCU), is a device consisting of a heat exchanger (coil) and a fan. FCUs are commonly used in HVAC systems of residential, commercial, and industrial buildings that use ducted split air conditioning or central plant cooling.

  7. Split-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Split-phase_electric_power

    The line to neutral voltage is half the line-to-line voltage. Lighting and small appliances may be connected between a line wire and the neutral. Higher-power appliances, such as cooking equipment, space heating, water heaters, clothes dryers, air conditioners and electric vehicle charging equipment, are connected to the two line conductors.

  8. Power rating - Wikipedia

    en.wikipedia.org/wiki/Power_rating

    The usual reason for the limit is heat, and the maximum heat dissipation is calculated as above. Power ratings are usually given in watts for real power and volt-amperes for apparent power , although for devices intended for use in large power systems, both may be given in a per-unit system .

  9. Heat meter - Wikipedia

    en.wikipedia.org/wiki/Heat_meter

    Right in white-blue: the calculator; in the center in bronze: the ultrasonic flow meter . A heat meter, thermal energy meter or energy meter is a device which measures thermal energy provided by a source or delivered to a sink, by measuring the flow rate of the heat transfer fluid and the change in its temperature between the outflow and return ...