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Ventilation in Mines

Ventilation in Mines


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...of the triangle Ocd and the rectangle cjiqd. Om is = r cos 30 = r0-866 Am = r x r cos 30 =?-(1-0-866) = r0134. Fig. 87. of the wheel, the capacity of the space OcpqdO must be multiplied by 6 = 6 x 0'567r2. The capacity of the space discharging the air into the atmosphere is equivalent to R2l3'1415, multiplied by the breadth L of the wheel (R representing the radins of the toothed wheel). Hence, there being two wheels, the theoretical volume of air discharged at each revolution is = 2L(3-1415R2-3-402r2). The usual distance between centres of the wheels of the Fabry fan was 2 metres (80 inches), the radins of the circle of contact 1 metre, and the radins of the case 17 metre. In such event, the volume of air expelled at each revolution = 22'G cubic metres. A fan of this kind, to discharge 20 cubic metres of air per second, must be run at a speed of 60 revolutions per minute; but the practical limit of speed was found to be 30 revolutions. Attempts were made to construct fans of larger size, but the maximum output attained never exceeded 35 cubic metres per revolution, or 10 to 11 cubic metres per second. A fan of this capacity consumed 12 to 15 horse-power, and cost 700 to 800, including motor and enclosure, but exclusive of boiler. Defects Of The Fabry Fan. It was found impossible to increase the dimensions of the Fabry fan beyond the above limits, owing to the difficulty of securing etfectual contact between the two wheels and proper air-tight connection of the parts. The excessive superficial dimensions of larger wheels also induced bending and distortion, owing to the excessive difference of deusity between the inner and outer air, the consequence being either too much or too little play for the surfaces of the teeth, ...


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Product Details
  • ISBN-13: 9781152100138
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 116
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1152100130
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 222 gr


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