. Applied thermodynamics for engineers. oling occurred dur-ing expulsion rather than during com-pression. The cooling effect dependslargely upon the heat transmissivepower of the cylinder walls, and the value of n consequently increases atFig. 66. Art. 201.—Cooling by Jackets. ^ • a j m • j high speeds. Two specimen cards are given in Fig. Q>Q>; ah being the isothermal and ac the adiabatic. Withmore thorough cooling, jacketedheads, etc., a lower value of nmay be obtained; but this valueis seldom or never below 67 shows a card givenby Unwin from a Cockerill com-pressor, DC indi
. Applied thermodynamics for engineers. oling occurred dur-ing expulsion rather than during com-pression. The cooling effect dependslargely upon the heat transmissivepower of the cylinder walls, and the value of n consequently increases atFig. 66. Art. 201.—Cooling by Jackets. ^ • a j m • j high speeds. Two specimen cards are given in Fig. Q>Q>; ah being the isothermal and ac the adiabatic. Withmore thorough cooling, jacketedheads, etc., a lower value of nmay be obtained; but this valueis seldom or never below 67 shows a card givenby Unwin from a Cockerill com-pressor, DC indicating the idealisothermal curve. At thehigher pressures, air is appar-ently more readily cooled; itsown heat-conducting power isincreased. 202. Heat Abstracted. InFig. 68, let AB and AC be the Fig. 67. Art. 201. —Cockerill Compressor withadiabatic and the actual paths, ^^^^^^ ^^^^*°s- An and GN adiabatics; the heat to be abstracted is then equivalent to NCAn = lACL -f- nAIE - NCLE. Now lACL =PJ^SZJ^, nAIE = -^,n — 1 V — 1.
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