. Railway mechanical engineer . , the amount depending on thelatent heat of evaporation. This for ammonia is 555 B. t. pound which, excepting water, is the highest of anymedium suitable for refrigerating purposes and hence is theliquid most universally used. Further, ammonia is liquefi-able at practical pressures. In the Baxter system there arefour distinct stages in the process, whether it be performingthe function of refrigeration or heating. These are the gen-eration of ammonia gas, condensation of the gas, expansionof the condensed gas from a liquid back to a gas, and theabsorption o
. Railway mechanical engineer . , the amount depending on thelatent heat of evaporation. This for ammonia is 555 B. t. pound which, excepting water, is the highest of anymedium suitable for refrigerating purposes and hence is theliquid most universally used. Further, ammonia is liquefi-able at practical pressures. In the Baxter system there arefour distinct stages in the process, whether it be performingthe function of refrigeration or heating. These are the gen-eration of ammonia gas, condensation of the gas, expansionof the condensed gas from a liquid back to a gas, and theabsorption of the gas in water for regeneration. Refrigeration.—The apparatus having been charged with astrong aqua ammonia solution (26 deg, Baume) and the ■ IlltK, 1910 RAILWAY MKCI1 WICAL ENGINEER 663 charcoal magazine filled, a &re is started on the urate .1 towhich the charcoal is fed automatically from the magazinewhich has a capacity of 14 days continuous operation. Theammonia having a lower boiling point than water, is dis-. Intertor View Showing Refrigerating Coils Located on Upper SideWalls and Near the Floor tilled oft first leaving behind the water which is now weakin ammonia. The generator B is so constructed that prac-tically all of the strong ammonia solution is forced into it bythe pump C, which by the way is operated by the ammonia the ammonia gas passes up through the pipe F to what isi ailed the analyser, which is a long vertical pipe exposingsufficient surface to condense and precipitate any entrainedmoisture back to the generator. The gas is then passedthrough a coil to remove any superheat it may contain beforeit passes to the condenser G. In the condenser the am-monia gas is liquefied ready to be revaporized at the expan-sion valve //. This revalorization produces the refrigera-tion and the gas as it passes through the refrigerating coils/ located on the upper side walls of the ear, abstracts theheat from the ear and it^ load and passes on to the absorberJ to be
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
