Steam power plants, their design and construction . I -^^^^P W4^ ^1 W w. Figure 18.—Power Plant, Lancaster Mills, Clinton, Mass. LOCKWOOn, GREENE & ENGINEERS. 48 STEAM POWER PLANTS. exceeded, very large ports are necessary to admit the largeramount of steam required with high-piston speeds, and theselarge ports increase the clearance of the engine and make it lesseconomical in the use of steam. Mean effective pressure.—When steam is admitted to a cylin-der during a portion of the stroke of an engine and then furthersupply is cut-off, the steam, after cut-oft occurs, begins toexpand as the
Steam power plants, their design and construction . I -^^^^P W4^ ^1 W w. Figure 18.—Power Plant, Lancaster Mills, Clinton, Mass. LOCKWOOn, GREENE & ENGINEERS. 48 STEAM POWER PLANTS. exceeded, very large ports are necessary to admit the largeramount of steam required with high-piston speeds, and theselarge ports increase the clearance of the engine and make it lesseconomical in the use of steam. Mean effective pressure.—When steam is admitted to a cylin-der during a portion of the stroke of an engine and then furthersupply is cut-off, the steam, after cut-oft occurs, begins toexpand as the piston advances and consequently the pressurefalls. The work done in the cylinder is proportional to the aver-age effective pressure throughout the stroke, hence it is necessaryin proportioning cylinders to know^ what this average or meaneftective pressure should be with different steam pressures. Themean effective pressure is one of the factors in the general equa-tion for determining the horse-power developed by an engine. Itsselection is an important matte
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