Question

12.11 3 Data water-cooled (122°C; 6.23 m³/kWh; 87.6%) A single-cylinder, single-acting reciprocating air compressor supplies a receiver from which the air is drawn off for process work. Taking the polytropic index of.compression and re-expansion as 1.3, and using the data below, calculate: (i) the pressure in the receiver; $Q_{rej}$ (ii) the rate of heat rejection from the receiver; (iii) the volumetric efficiency of the compressor; $\eta_v$ (iv) the required power input to the compressor. Cylinder bore, 200 mm; stroke, 250 mm; rotational speed, 440 rev/min; clearance volume, 5% of swept volume; ambient pressure and temperature in compressor house, 1.01 bar and 10°C; average pressure and temperature during the induction stroke, 1 bar and 273 83k 20°C; volume flow rate of air drawn off for process work, 0.6 m³/min at 17°C. Note: Use a trial-and-error method for part (i). 200 3k (5 bar; 8.14 kW; 83.9%; 9.85 kW) of 3 in to 175 har

          12.11
3
Data
water-cooled
(122°C; 6.23 m³/kWh; 87.6%)
A single-cylinder, single-acting reciprocating air compressor supplies a
receiver from which the air is drawn off for process work. Taking the polytropic index
of.compression and re-expansion as 1.3, and using the data below, calculate:
(i) the pressure in the receiver;
$Q_{rej}$
(ii) the rate of heat rejection from the receiver;
(iii) the volumetric efficiency of the compressor; $\eta_v$
(iv) the required power input to the compressor.
Cylinder bore, 200 mm; stroke, 250 mm; rotational speed, 440 rev/min; clearance volume,
5% of swept volume; ambient pressure and temperature in compressor house, 1.01 bar
and 10°C; average pressure and temperature during the induction stroke, 1 bar and
273
83k 20°C; volume flow rate of air drawn off for process work, 0.6 m³/min at 17°C.
Note: Use a trial-and-error method for part (i). 200
3k
(5 bar; 8.14 kW; 83.9%; 9.85 kW)
of
3 in to 175 har

12.11
3
Data
water-cooled
(122°C; 6.23 m³/kWh; 87.6%)
A single-cylinder, single-acting reciprocating air compressor supplies a
receiver from which the air is drawn off for process work. Taking the polytropic index
of.compression and re-expansion as 1.3, and using the data below, calculate:
(i) the pressure in the receiver;
Qrej
(ii) the rate of heat rejection from the receiver;
(iii) the volumetric efficiency of the compressor;
(iv) the required power input to the compressor.
Cylinder bore, 200 mm; stroke, 250 mm; rotational speed, 440 rev/min; clearance volume,
5% of swept volume; ambient pressure and temperature in compressor house, 1.01 bar
and 10°C; average pressure and temperature during the induction stroke, 1 bar and
273
83k 20°C; volume flow rate of air drawn off for process work, 0.6 m³/min at 17°C.
Note: Use a trial-and-error method for part (i). 200
3k
(5 bar; 8.14 kW; 83.9%; 9.85 kW)
of
3 in to 175 har

Added by Ruben S.

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