A compressor installed at a whalf (for loading container ships) is able to provi

Question

A compressor installed at a whalf (for loading container ships) is able to provide 6 bar.g pressure into the pressure reciever. The compressor is moved to a site that is 5000 ft above sea level (atmospheric pressure 0.85 bar.a) in the mountains. What is the discharge revised discharge pressure (guage pressure) of the compressor ?

Assume there is no change in temperature.

Part (b) (2 marks)

Is the assumption of change in temperature valid for calculating the discharge pressure of the compressor ?

Part (c) (4 marks)

The temperature at the whalf is 35 oC and in the mountains is 19 oC, what is the reduction in volumetic output from the compressor ?

Explanation / Answer

1. Inlet presure of the compressure = atmospheric pressure p1= 1 bar;

after compression p2 = 6 bar ;

compression ratio = 6/1 = 6;

When taken at 5000 ft height the atmospheric pressure = 0.85;

for the case the compression ration always remains constant for a compressro which in this case is 6;

so for pi =0,85 the value of p2 = 0.85 *6 = 5.1 bar;

2. No the assumption is not ok as after compression the temperature also changes

and also the inlet conditions change

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