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These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
The advent and evolution of new technologies have also played a major role in ceiling fan development. Following is a list of major ceiling fan styles and their defining characteristics: Cast-iron ceiling fans. These account for almost all ceiling fans made since their invention in 1882 through the mid-1960s.
Susceptors may be added to "crisping sleeves" in convenience foods such as Hot Pockets.. A susceptor is a material used for its ability to absorb electromagnetic energy and convert it to heat (which in some cases is re-emitted as infrared thermal radiation).
All jet engines require high temperature gas for good efficiency, typically achieved by combusting hydrocarbon or hydrogen fuel. Combustion temperatures can be as high as 3500K (5841F) in rockets, far above the melting point of most materials, but normal airbreathing jet engines use rather lower temperatures.
Flue gas condensation is a process, where flue gas is cooled below its water dew point and the heat released by the resulting condensation of water is recovered as low temperature heat. Cooling of the flue gas can be performed either directly with a heat exchanger or indirectly via a condensing scrubber .
Lupus metallorum was used to purify gold, as the sulphur in the antimony sulphide bonds to the metals alloyed with the gold, and these form a slag which can be removed. The gold remains dissolved in the metallic antimony which can be boiled off to leave the purified gold.
Upper section of the scepter, with the fleur-de-lis and statuette of Charlemagne. The scepter of Charles V, also known in the early modern period as scepter of Charlemagne, is one of the most prominent preserved regalia of the Kingdom of France. It was donated by Charles V to the abbey of Saint-Denis on 7 May 1380, shortly before his death. [1]
A sceptre (or scepter in American English) is a staff or wand held in the hand by a ruling monarch as an item of royal or imperial insignia, signifying sovereign authority. Antiquity [ edit ]
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