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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.
With this in mind we can say that, the very simplest fuel control for a turbine engine is a fuel valve operated by the pilot. Many pre-production models of early turbojet engines featured just that, but it was soon found that this kind of control was difficult and dangerous in actual use.
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).
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 .
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 ]
Qing dynasty wood and jade three-inlay ruyi. Chinese classic texts from the Former Han dynasty (206 BC – 24 AD) contain the earliest usages of the word ruyi.For example, the Shiji history uses it both literally for "as desired" and for the given name of Liu Ruyi (Chinese: 劉如意; pinyin: Liú rúyì) (d. 195 BC), who was the son of Emperor Gaozu of Han and Concubine Qi.