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TEFC enclosed motors usually cost more than open motors, but offer increased protection against weather, dirt, and moisture. TEFC motors are constructed with a small fan on the rear shaft of the motor, covered by a housing. This fan forces air over the motor frame fins, and cools the motor. The enclosure is "Totally Enclosed".
Electrical heaters are often used as backup or supplemental heat for heat pump systems. The heat pump gained popularity in the 1950s in Japan and the United States. [14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the ...
By 2008, a report by the United States Department of Energy ranked the firm as fifth in the US in the central air conditioner and heat pump market with a 12% market share (behind UTC/Carrier with 27%, both Goodman/Amana and American Standard/Trane with 14% and Lennox with 12%), while in the residential gas furnace market as of 2008, the company ...
So (as an example) a 10 HP motor is most efficient when driving a load that requires 7.5 HP. [104] Efficiency also depends on motor size; larger motors tend to be more efficient. [ 105 ] Some motors can not operate continually for more than a specified period of time (e.g. for more than an hour per run) [ 106 ]
A horse-powered pump had been installed in 1735 to return water to the pool above the Old Blast Furnace. This was replaced by a Newcomen engine in 1742–3. [18] Several new furnaces built in Shropshire in the 1750s were powered in a similar way, including Horsehay and Ketley Furnaces and Madeley Wood or Bedlam Furnaces. [19]
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