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Heating, Ventilating, Air Conditioning Guide Volume 1

Heating, Ventilating, Air Conditioning Guide Volume 1


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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. 1922 Excerpt: ...wet-bulb depression for a temperature of 83 to be U.000034 + 0.3 (0.000039--0.000034) = 0.0O00355. Then the weight of moist air at 83, 15 wet-bulb depression, and 29.40 inch barometer will be 0.07034--0.00045 + 0.001 + 0.00053 = 0.07142 lb. per cu. ft. Specific Heat of Air The specific heat of air is the ratio of the heat required to raise the temperature of a given weight of air through one degree as compared to the heat required to raise the temperature of the same weight of water from 62 to 63 degrees Fahr., i. e., it is the B. t. u. required to raise one pound of air one degree Fahr. The specific heat of air may be expressed as either of two factors, specific heat at constant pressure or at constant volume. It is the specific heat at constant pressure that is ordinarily referred to. The factors commonly used heretofore have been those determined by Renault---specific heat at constant pressure = 0.2375, and at constant volume = 0.1689. But recent investigation tends to show that the value 0.2375 is too low, and that it should be Cp = 0.24112 + 0.0000091 or for ordinary purposes approximately 0.2415. For the specific heats of various substances see the table on page I5f. Relation of Velocity to Pressure The laws governing the flow or air are perhaps less understood than almost any other branch of engineering data. The flow of air under high pressures must necessarily be investigated thermodynamically and the formulae are more or less complicated. For ordinary fan work, however, where air is at low pressure but slight error is introduced if the same formulae are applied to the flow of air as are commonly used for the flow of water. The basic formula for such calculations is V8 = l/2gh (10) where V3 = velocity in ft. per second, or v=6oi/7j; (11) where V = ...


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Product Details
  • ISBN-13: 9781231130667
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1231130660
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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