Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig. 194.—Arrangement of thevapor refrigerating machinery. Fig. 195.—P-V diagram of thevapor refrigerating machine. Com-pressor and expansive cylinder. straction of heat is possible. This abstraction condenses thevapor and after the pressure on the liquid is so reduced thatthe temperature of vaporization is very low, the liquid mayevaporate by the heat abstracted from a space at a lowtemperature. The temperature of cooling water fixes the upperpressure and the temperature of the refrigerat
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Fig. 194.—Arrangement of thevapor refrigerating machinery. Fig. 195.—P-V diagram of thevapor refrigerating machine. Com-pressor and expansive cylinder. straction of heat is possible. This abstraction condenses thevapor and after the pressure on the liquid is so reduced thatthe temperature of vaporization is very low, the liquid mayevaporate by the heat abstracted from a space at a lowtemperature. The temperature of cooling water fixes the upperpressure and the temperature of the refrigerated space fixesthe necessary low pressure. It is merely a matter of pressureregulation to fix the temperature limits. REFRIGERATION 425. The apparatus used to accomplish this result is shown in Fig. 195 represents the PV diagram for the cycle. In the compressor A the ammonia or other vapor is com-pressed adiabatically from 1 to 2. This will superheat the am-monia vapor if dry vapor is taken into the cylinder, while if thereis considerable liquid mixed with the vapor the compression willreduce the amount of this liquid. The first is called dry com-pression and the second wet compression. These two lines areshown in Fig. 196 which is the T-S diagram of the line 1-2 in either case is an adiabatic. It is seen moreclearly from Fig. 196 thatthe temperature is increasedas the compression takesplace so that when the com-pressed vapor is deliveredfrom the compressor into thecondensing coil or condenser,B, this water may abstractheat and condense the occurs from 2 to 3 in while in Fig. 195 the line2-3 represents the dischargefrom the compressor and 3-3represents the volume of the liquid. At
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
