File:Compressed air production; or, The theory and practice of air compression (1898) (14591208157).jpg

Identifier: compressedairpro00saun (find matches)
Title: Compressed air production; or, The theory and practice of air compression
Year: 1898 (1890s)
Authors: Saunders, W. L. (William Lawrence), 1856-1931
Subjects: Compressed air
Publisher: New York, Compressed air
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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shown,because the purpose of the illustration is to show the comparative effectof the various methods of cooling. The air was compressed to 150pounds gauge pressure, the work done in each case being represented bythe area between the pressure curve and the rectangular lines. The pressure curve is determined in each case by the formula— (v)B In the case of isothermal compression (assuming no heat produced),the exponent N=i. In adiabatic compressidn (the full effect of the heatof compression being available), N= 1.408. It is obvious that the value From a paper by Mr. 11. A. Parke. COMPRESSED AIR PRODUCTION. 19 of the exponent N will vary between the two points 1, and 1.408. Froma large number of indicator cards taken at the Stevens Institute the fol-lowing values were shown: Water jacket N=i.35 Water jet injection N=i.33 Water spray injection N—1.25 It has been demonstrated by experiments made in France that thepower required to compress dry air has been prepared from the data of M.
Text Appearing After Image:
Fig. 6. Mallard, and shows that for five atmospheres the work expended in com-pressing one pound of dry air is 58,500 foot pounds, while that for moistair is 52,500 foot pounds. In expansion also moisture in the air adds tothe economy, but in both cases the saving of power is not great enoughto compensate for the many disadvantages due to the presence of water.Mr. Norman Selfe, of the Engineering Association of N. S. W., hascompiled a table which shows some important theoretical conditions in-volved in producing compressed air. 20 COMPRESSED AIR PRODUCTION. P►4O > H P fc ° 3 5 £ 5 s a ;> en -2 .ji w w <J a p-0 o «o cfc o a3 ^S aiy o; J3;bav jo 33b;u30J3j eo -in -* i!o 6 50 •uots -ssjdxno3 nt pasn si j3)bm. jt amiBj^dmaj, lBUJJ SfSSo riSti oS i! 2 rt«^ « — Si o*o «W •° ■£ k/ TO U Si 3 2 * ° S S « 2«^£$ u V Q M .2 ll-sll afe ^o a o V uSi. • wH.2<n u Si - *£ to £ OS ■a -mTJ - «.2 o S o !»: aS.SoS •saaaiidsoia^v I uoisusj. M3M3 ... I &l

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