Examples 1.A single-acting reciprocating compressor induces 1 m 3 of air per minute at 1.013 b, 15 o C, and delivers it at 7 b. Compression follows pv.

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Presentation transcript:

Examples 1.A single-acting reciprocating compressor induces 1 m 3 of air per minute at b, 15 o C, and delivers it at 7 b. Compression follows pv 1.35 =c and the clearance can be neglected. Determine the indicated power. 2.If the compressor above operates at the speed N=300 rpm, determine the cylinder bore if the stroke to bore ratio is 1.5:1 3.Find the isothermal efficiency for the compressor above.

Examples 4.A double-acting compressor induces 14 m 3 air per minute at b and 15 o C. Delivery pressure is 7 b and the compressor speed is 300 rpm. If the clearance volume is 5% of swept volume and compression index is 1.3, find V s and indicated power. 5.Air at free air condition of b and 15 o C enters a double-acting compressor at 14 m 3 /min. During the intake stroke, cylinder pressure is 0.95 b and the temperature is 32 o C. Delivery pressure is 7 b and the compression and expansion index is 1.3. If the clearance volume is 5% of the swept volume, find the volumetric efficiency.

Examples 6.In a single-acting, 2 stage compressor, 4.5 kg/min of air is compressed from b and 15 o C over a 9:1 pressure ratio. Both stages have the same pressure ratios and follow pv 1.3 =c for all compression and expansion processes. Clearance volume is 5% of the swept volume for both stages, and the compressor operates at 300 rpm. If intercooling is complete, find the indicated power and the swept volume for both stages.