"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . No. 14.—Diagram from Compressor, Refrigeration 571 line ; also that the pressure rises to 50 lbs. (gauge) and the tempera-ture to 2S0 r\ihr. The air at 50 lbs. pressure and 280° temperature is discharged intothe cooler, where most of the heat (work) is carried off by the circu-lating water passi
"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . No. 14.—Diagram from Compressor, Refrigeration 571 line ; also that the pressure rises to 50 lbs. (gauge) and the tempera-ture to 2S0 r\ihr. The air at 50 lbs. pressure and 280° temperature is discharged intothe cooler, where most of the heat (work) is carried off by the circu-lating water passing through the cooler overboard, so that the air,still at 50 lbs. pressure, is now reduced to a temperature of dy Fahr. TEMP 36°. TEMP -90No. 15.—Diagram from Expander. This necessary loss of heat in the cooler accounts for the differencein area in the compressor and expander diagrams, and means thatwork at least equal to the loss must be given out by the steamcylinders of the machine. In the expander diagram, which is of less area than the com-pressor diagram, notice that the compressed air enters the expansioncylinder at a pressure of 49 lbs. and a temperature of only 36° Fahr., sothat when the air is cut off at three-eighths stroke it expands and fallsin pressure to about i or 2 lbs. above the atmosphere; but the fall intemperature is very much more in proportion, as work is being doneby the air in assisting to dri\e the expander piston. Briefly, by thecombined effects of low initial temperature, expansion, and workdone, the exhaust temperature is reduced to —90 Fahr. or to —100°Fahr. NOTE.—If the air merely expanded without doing work the pressure woulddrop, but the temperature would remain constan
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