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Home > History and Archaeology > History > Mechanics of Heating and Ventilating; With Charts for Calculation and Examples
Mechanics of Heating and Ventilating; With Charts for Calculation and Examples

Mechanics of Heating and Ventilating; With Charts for Calculation and Examples


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: would have no bearing on the result. In problems of discharge, a small error in the friction, as one item in the total head, will not mean the same, but a still smaller discrepancy in the volume carried. Local Resistances.?The assumption explained in the general introduction, that the coefficient of resistance decreases with the velocity, as the coefficient of friction, when applied to water, yl.8 make the formula for the loss of head h=1.38 r . The v constant 1.38 represents the ratio of- - for v = 10 ft., so that yl-80 hr would be a function of at that velocity, and would assume somewhat higher values for lower speeds, and vice versa. Taking for instance on Chart I the resistance for an open bend, for which r = .42, we find the loss of head at 10 ft. to be .65 ft. which equals V2 V2 V2 r . At 5 ft. the chart gives - - = .38 ft., and r would be.42 X 2g -2g 2g .38 = .16 ft., while the direct reading of hr for that form on the line of 5 ft. velocity is .175 ft. As stated previously, this increase in values is justified, partly on experimental grounds, and also because the factor r should be somewhat greater for small size fittings in which the velocities are generally lower. The charts are thereby simplified while presenting values at least as accurate, on the average, as usually obtained by formula with coefficients to be selected in each case. The practice of expressing resistances of eIbows or other features in equivalents of pipe lengths, is good for only one size, and when expressed in diameters it is strictly correct only at one velocity. These rules, therefore, are likely to be less accurate than the values obtained from the charts. Little data is available giving the coefficients for the standard designs, or even the average types of commerc...


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Product Details
  • ISBN-13: 9780217018043
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 0217018041
  • Publisher Date: 16 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr

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Mechanics of Heating and Ventilating; With Charts for Calculation and Examples
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