Compressed air production; or, The theory and practice of air compression . gure 3 is a graphic diagram drawn for the purpose of illustratingthe fact that the power which is contained in any volume of air at a givenpressure is dependent upon its distance in temperature above the absolutezero, and that there is as much power in a pound of air at fifteen poundsgauge pressure and 60 degrees temperature as there is in one pound of airat 100 pounds gauge pressure and 60 degrees temperature. One pound,or thirteen cubic feet, of air at fifteen pounds pressure and 60 degreestemperature, is represented
Compressed air production; or, The theory and practice of air compression . gure 3 is a graphic diagram drawn for the purpose of illustratingthe fact that the power which is contained in any volume of air at a givenpressure is dependent upon its distance in temperature above the absolutezero, and that there is as much power in a pound of air at fifteen poundsgauge pressure and 60 degrees temperature as there is in one pound of airat 100 pounds gauge pressure and 60 degrees temperature. One pound,or thirteen cubic feet, of air at fifteen pounds pressure and 60 degreestemperature, is represented by the space C. The available power in thisair is 21,469 foot pounds. By available power is meant the amount ofpower which can be utilized when this air is expanded adiabatically toatmospheric pressure. The diagram shows that when such pressure isreached the temperature will be—57 degrees Fahr. There still remainsin this air a certain amount of intrinsic energy, and the diagram and fig- £ fe-v o vy. YAn&-. >-5; !46t°»b6olute iVre&au-re. ••*• * »B. To loo^^ Grange Pressutc A. To \5^)SGravg,e ?re& ^^?_6o°«riij0xl8i^ = JUA&9 ;| °-60o=4-14-°« 77,804., £. cr. froTtvWl,14,(ia»)« ?Tets,«Te. JO. ftom. looH<}AUrfe *+6o°-ll7,xifcV= 2I,46« FfcfAs, -a640+6o°~« 77,00* » 6o° «\: J\Trro»sbK«<rVc »»M»uTt. to JllifcOluTle ItTo. 4-61°-?7o»°X 1 aa* m ^.l^. _4-»l-S64.,-97)ll»iTH ftTot*\.Ci»niE- * Total f. 05,60a Ft «.Pi«. Fig. 3. ures show that this energy is equal to 74,134 foot pounds. This addedto the available energy gives us 95,603 foot pounds as the whole energycontained in one pound of air at fifteen pounds pressure and 60 degreestemperature. D represents one pound of air at 100 pounds pressure and 60 degreestemperature. Its available energy is 77,804 foot pounds, and its intrinsicenergy is i/,799 foot pounds
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Keywords: ., bookcentury1800, bookdecade1890, bookid, booksubjectcompressedair
