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In addition, a ducted application eliminates the need for regular replacement of the filters and avoids the airflow restriction (and the resultant loss of power) caused by them. However, the ducted application can be impractical, due to lack of space or ability to install a duct system, make-up air requirements, or the additional cost of ...
In parts of the world such as India, where the temperature reaches above 100 °F (38 °C), standing and electric box fans are essential in the business world for customer comfort and an efficient work environment. Fans have become solar-powered, energy-efficient, and battery-powered in places with unreliable energy sources.
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Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...
Later in 1943, the British ground tested the Metrovick F.3 [40] turbofan, which used the Metrovick F.2 turbojet as a gas generator with the exhaust discharging into a close-coupled aft-fan module comprising a contra-rotating LP turbine system driving two co-axial contra-rotating fans.
The East Broad Top Railroad and Coal Company was chartered in 1856. Due to financial constraints and the American Civil War, the railroad was not built by its original charterers, but a new group of investors began to acquire right-of-way in 1867 and was able to construct the railroad as a 3 ft (914 mm) narrow gauge line in 1872–1874.