Q 3:Reciprocating compressor induces air at 95 kN/m and 30°C, and compresses it through anoverall pressure ratio of 6/1. The compressor has a bore and stroke of 15 and 24 cmrespectively. If the free air delivery is 1330 lit/min, the polytropic index is 1.3, and theclearance ratio is 6%. Calculate:a. Indicated power per unit mass of air.b. Volumetric efficiency.c. Rotational speed of the compressor.(Ans: 193 kW/kg/s, 73.3%, 428 rev/min)Q4:Estimate the horsepower required to drive a two-stage reciprocating compressor used todeliver 3.5 m'/min of air from 1 bar and 20°C to the final pressure of 36 bar. Theintermediate receiver cools the air to the temperature of 43°C under constant pressure of6 bar. Calculate also the capacity of the circulating pump needed to handle the receivercooling water with a temperature rise of 8°C.Neglect the clearance and assume that the polytropic index is 1.3, and take the specificheat for air as 1.005 kl/kg K, and for water as 4.2 kJ/kg K.( Ans: 36 hp, 15.8 lit/min )

Mechanical efficiency is a ratio of the brake power and indicated power. This shows the…

overall pressure ratio of 6/1. The compressor has a bore and stroke of 15 and 24 cm respectively. If the free air delivery is 1330 lit/min, the polytropic index is 1.3, and the clearance ratio is 6%. Calculate: a. Indicated power per unit mass of air. b. Volumetric efficiency. C. Rotational speed of the compressor.

overall pressure ratio of 6/1. The compressor has a bore and stroke of 15 and 24 cm respectively. If the free air delivery is 1330 lit/min, the polytropic index is 1.3, and the clearance ratio is 6%. Calculate: a. Indicated power per unit mass of air. b. Volumetric efficiency. C. Rotational speed of the compressor.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

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Question

Q 3:
Reciprocating compressor induces air at 95 kN/m and 30°C, and compresses it through an
overall pressure ratio of 6/1. The compressor has a bore and stroke of 15 and 24 cm
respectively. If the free air delivery is 1330 lit/min, the polytropic index is 1.3, and the
clearance ratio is 6%. Calculate:
a. Indicated power per unit mass of air.
b. Volumetric efficiency.
c. Rotational speed of the compressor.
(Ans: 193 kW/kg/s, 73.3%, 428 rev/min)
Q4:
Estimate the horsepower required to drive a two-stage reciprocating compressor used to
deliver 3.5 m'/min of air from 1 bar and 20°C to the final pressure of 36 bar. The
intermediate receiver cools the air to the temperature of 43°C under constant pressure of
6 bar. Calculate also the capacity of the circulating pump needed to handle the receiver
cooling water with a temperature rise of 8°C.
Neglect the clearance and assume that the polytropic index is 1.3, and take the specific
heat for air as 1.005 kl/kg K, and for water as 4.2 kJ/kg K.
( Ans: 36 hp, 15.8 lit/min )

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