. Applied thermodynamics for engineers. j 1 ^^^^sssss§^^ Fig. 87. Art. 240. — Sommeiller Hydraulic Piston Compressor. 240. Hydraulic Piston Compressors: Sommeillers. In Fig. 87, as the piston Fmoves to the right, air is drawn through C to G, together with coohng waterfrom B. On the return stroke, the air is compressed and discharged through Dand A. Indicator diagrams are given in Fig. 88. 136 APPLIED THERMODYNAMICS The value of n is exceptionally low, and clearance expansion almost elimi-nated. This was the first commercial piston compressor, and it is still used to a s 8 (I II. Fig. 88. Art.
. Applied thermodynamics for engineers. j 1 ^^^^sssss§^^ Fig. 87. Art. 240. — Sommeiller Hydraulic Piston Compressor. 240. Hydraulic Piston Compressors: Sommeillers. In Fig. 87, as the piston Fmoves to the right, air is drawn through C to G, together with coohng waterfrom B. On the return stroke, the air is compressed and discharged through Dand A. Indicator diagrams are given in Fig. 88. 136 APPLIED THERMODYNAMICS The value of n is exceptionally low, and clearance expansion almost elimi-nated. This was the first commercial piston compressor, and it is still used to a s 8 (I II. Fig. 88. Art. 240.—Variable Discharge Pressure Indicator Diagrams, Sommeiller Compressor. limited extent in Europe, the large volume of water present giving effective cool-ing. It cannot be operated at high speeds, on account of the inertia of thewater. The Leavitt hydraulic piston compressor at the Calumet and Hecla coppermines, Michigan, has double-acting cylinders 60 by 42 in., and runs at 25 revolu-tions per minute, a comparativelyhigh speed. The value of n from thecard shown in Fig. 89 is 241. Taylor Hydraulic Compressor. Water is conducted through a verticalshaft at the necessary head ( ft. perpound pressure) to a separating cham-
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