. Practical physics. and a speed of 22 J- knots, is driven by four steamturbines having a total horse power of (51,000. One of the immenserotors contains .)0,000 blades and develops 22,000 horse jiower. TheUnited States Shipping Board, on July 24, 1919, announced plans for INDUSTRIAL APPLICATIONS 201 building two gigantic ocean liners swifter and larger than any are to be 1000 feet long and are to have a horse power of 110,000and a speed of .0 knots. (See opposite p. ) 248. Manufactured ice. In the great majority of modern ice plantsthe low temperature required for the manufac
. Practical physics. and a speed of 22 J- knots, is driven by four steamturbines having a total horse power of (51,000. One of the immenserotors contains .)0,000 blades and develops 22,000 horse jiower. TheUnited States Shipping Board, on July 24, 1919, announced plans for INDUSTRIAL APPLICATIONS 201 building two gigantic ocean liners swifter and larger than any are to be 1000 feet long and are to have a horse power of 110,000and a speed of .0 knots. (See opposite p. ) 248. Manufactured ice. In the great majority of modern ice plantsthe low temperature required for the manufacture of the ice is producedby the rapid evaj^oration of liquid ammonia. At ordinary temperaturesammonia is a gas, but it may be liquefied by pressure alone. At 80° pressure of 155 pounds \^er square inch, or about 10 atmospheres, isrequired to produce its liquefaction. Fig. 192 shows the essential partsof an ice plant. The compressor, which is usually nin by a steam engine, £oty PressureGauge High FressureGauge. Fig. 192. Compression system of ice manufacture forces the gaseous ammonia under a pressure of 155 pounds into the con-denser coils shown on the right, and there liquefies it. The heat of con-densation of the ammonia is carried off by the running water whichconstantly circulates about the condenser coils. From the condenserthe liquid ammonia is allowed to pass very slowly through the regulat-ing valve V into the coils of the evaporator, from which the evaporatedammonia is pumped out so rapidly that the pressure within the coilsdoes not rise above 34 pounds. It will be noted from the figure tliatthe same pump which is there labeled the compressor exhausts theammonia from the evaporating coils and compresses it in the condensingcoils, for the valves are so arranged that the pvimp acts as an exhaustpump on one side and as a comjiression pump on the other. The rapidevaporation of the liquid ammonia under the reduced pressure existing 202 CHANGE OF STATE withiu the eva
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
