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Electrical Engineering Papers

Electrical Engineering Papers


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...large where proper conduits are furnished. Cases have been noted where as much as 30 to 40 percent of the available pressure has been taken up by improperly designed inlet pipes. Where the ventilating fans are driven independently of the main rotor, that is, by motors, it is practicable to vary the air pressure to suit the requirements, provided the driving motor can have its speed adjusted over a suitable range. This makes the ventilation more or less independent of restrictions. It has the further advantage of allowing the quantity of air to be varied to suit the load conditions. By this means an increased quantity of air, but with correspondingly increased windage loss, is available with heavy loads, while less air with lower losses may be used at lighter load. This arrangement is somewhat more efficient than the self-cooled arrangement with the fans on the main motor shaft, principally because of the excessively high fan speeds common in the latter case, especially on turbo-generators in which fan speeds far above efficient operation are used. In fact, in highspeed turbo-generators fan efficiencies of 20 to 30 percent are not unusual. Much better efficiencies can be obtained from separate slower speed fans (50 to 60 percent). However, the reduction in windage losses is not proportional to the increased efficiency of the fans, for part of the windage loss is due to "churning" of the air passing over the rotor, and this will be present regardless of the method of supplying air to the machine and is, to a certain extent, a function of the quantity of air which passes through the air-gap. This part of the windage loss is, therefore, greater in those machines where all the cooling air passes through the air-gap than is the case, with those types wh...


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Product Details
  • ISBN-13: 9781153376822
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 262
  • Spine Width: 14 mm
  • Width: 189 mm
  • ISBN-10: 1153376822
  • Publisher Date: 22 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 476 gr


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