The Transmission of Power by Compressed Air

Robert Zahner

ISBN 10: 0217640567 / ISBN 13: 9780217640565

Published by Rarebooksclub.com, 2012

Pages are clean and are not marred by notes or folds of any kind. ~ ThriftBooks: Read More, Spend Less. Seller Inventory # G0217640567I2N00

Synopsis:

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. 1890 edition. Excerpt: ...at the temperature t0. 3. Increased by the work necessary to force the compressed air into the receiving reservoir; this is given by the expression py vt, vl being the volume of a weight of air w at the pressure p, and temperature tv As no heat passes between the air and external bodies, the thermal equivalent of the work, according to the mechanical theory of heat, is the difference between the quantity of internal heat possessed by the air at its entrance into the cylinder, and that possessed by it at its exit. The heat possessed by the air at its entrance into the cylinder is, wc'r,; The internal heat at its exit is, Wc't,. Hence the work of compression is, Jwc' r,--Jwc' rB=Jwc' (r,--r0), and the net work is, W, =.JcV(r,-r.)-pnv, +pivl. Substituting for p00 and pti their values from eq. (34) we have, W,=J?ec (r,-r0) (35) an equation perfectly general for dry atmospheric air. III. WORK OBTAINABLE FROM THE COMPRESSED AIR. If, by any process, we cause a weight of air w to pass from one reservoir, in which there is a constant pressure pt, into another reservoir, in which there is a constant pressure pt, and thereby consume an amount of work W,, the same weight of air w (supposing the air to remain in the same physical conditions) will restore the amount of consumed work W, in passing back from the second reservoir into the first. These are the conditions of a perfect thermodynamic engine. The work theoretically obtainable from compressed air is, therefore, eq.(35), an equation which shows how important it is to take into account the initial and final temperature of the air. IV. THE THEORY OF COMPRESSION. 1. The Work necessary,and the Volume of the Compressing-Cylinder.--Neglecting all dead spaces and resistances, we can easily...

Bibliographic Details

Title: The Transmission of Power by Compressed Air
Publisher: Rarebooksclub.com
Publication Date: 2012
Binding: Paperback
Condition: As New
Dust Jacket Condition: No Jacket