Centrifugal air compressor, Mechanical Engineering

Centrifugal air compressor:

A centrifugal air compressor delivers 15Kg of air per minute. The outlet and inlet conditions are

At inlet: Velocity = 5m/sec, enthalpy = 5KJ/kg

At outlet: Velocity = 7.5m/sec, enthalpy = 173KJ/kg

Heat loss to the cooling water is 756KJ/min find:

(1)  The power of motor required to drive compressor.

(2)  Ratio of inlet pipe diameter to outlet pipe diameter when specific volumes of air at inlet and outlet are 0.5m3/kg and 0.15m3/kg correspondingly. Inlet and outlet lines are at same level.

Sol: Device: Centrifugal compressor Mass flow rate mf  = 15Kg/min Condition at inlet:

 

611_Centrifugal air compressor.png

V1  = 5m/sec; h1  = 5KJ/kg

Condition at exit:

V2  = 7.5m/sec; h3  = 173KJ/kg

Heat loss to cooling water Q =  -756 KJ/min

From SFEE

138_Centrifugal air compressor1.png

WS= -3276.23KJ/min = - 54.60KJ/sec                              .......ANS

(negative sign indicate that work done on the system) Thus the power of motor required to drive the compressor is 54.60KW

Mass flow rate at inlet = Mass flow rate at outlet = 15kg/min = 15/60 kg/sec

Mass flow rate at inlet = mf1  = A1.V1/  ν1

15/60 = A1  × 5/0.5

A1  = 0.025m2

Now; Mass flow rate at outlet = mf2  = A2.V22

15/60 = A2  × 7.5/0.15

2046_Centrifugal air compressor2.png

Thus the ratio of inlet pipe diameter to outlet pipe diameter is 2.236

Posted Date: 10/15/2012 9:25:24 AM | Location : United States







Related Discussions:- Centrifugal air compressor, Assignment Help, Ask Question on Centrifugal air compressor, Get Answer, Expert's Help, Centrifugal air compressor Discussions

Write discussion on Centrifugal air compressor
Your posts are moderated
Related Questions
Scissors Crossing: A scissors crossing consists of two crossovers overlapping each other. It is shown in Figure. Figure: Scissors Crossover Triangles

Draw bending moment diagram: Draw the shear force diagram (SFD) & bending moment diagram (BMD) for the beam illustrated in Figure . Solution Reaction at the support A,



Time Dilation The measurement of time involves the concept of clocks attached at each position co-ordinate of a Lorentz frame. As a consequence of Lorentz transformations, it i


What is the difference between a mechanical component and a mechanical part?


Explain Gauge Pressure (P gauge ) Gauge Pressure is the pressure of a fluid contained in a closed vessel. It is all time more than atmospheric pressure. It is calculated by an

Q. Show Seismic Loads For Ground Supported Equipment? V = C s W is the governing equation for horizontal seismic base shear of ground supported equipment. C s  = 1.2A v S/(RT