# A. A single-acting, single-cylinder re [ c 3 ip 1 r 2 o . c 7 a k ti W n ] g air compressor receives

A.A single-acting, single-cylinder re[c3ip1r2o.c7 aktiWn]g air compressor receives 30 m3 of atmopheric air per hour at 1 bar and 15°C . It runs at 450 rpmand discharges air at 6.5 bar. It has a mechanical efficiency of 80% and a clearance ratio of 8.9%. Calculate (a) the volumetric efficiency, (b) mean effcetive pressure, ( c) brake power. B. Calculate the power required to drive 1a. 4s8in kgWle]stage, single-acting reciprocating air compressor to compress 8 m3/min of air, receiving at 1 bar, 20°C to 7 bar. The index of compression is 1.3. Also, calculate the percentage saving in
A.A single-acting, single-cylinder re[c3ip1r2o.c7 aktiWn]g air compressor receives 30 m3 of atmopheric air per hour at 1 bar and 15°C . It runs at 450 rpmand discharges air at 6.5 bar. It has a mechanical efficiency of 80% and a clearance ratio of 8.9%. Calculate (a) the volumetric efficiency, (b) mean effcetive pressure, ( c) brake power. B. Calculate the power required to drive 1a. 4s8in kgWle]stage, single-acting reciprocating air compressor to compress 8 m3/min of air, receiving at 1 bar, 20°C to 7 bar. The index of compression is 1.3. Also, calculate the percentage saving in indicated power by compressing the same mass of air (a) in two stages with optimum intercooler pressure and perfect intercooling, (b) in two stages with imperfect intercooling to 27°C, intercooler pressure remaining the same as in case in (a), (c) in three stages with optimum intercooler and perfect cooling.

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