What is compression? Classify the air compressors. Obtain the condition for minimum work requirement for complete inter-cooling between the stages in a multistage compressor?
Answers
Explanation:
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor.
Air compressors may be broadly classified as given below:
(i) Reciprocating and
(ii) Rotary.
The principle parts of a reciprocating air compressor are same as that of a reciprocating I.C.
If an intercooler is installed between cylinders, in which the compressed air is cooled between cylinders, then the final delivery temperature is reduced.
This reduction in temperature means a reduction in internal energy of the delivered air, and since this energy must have come from the input energy required to drive the machine this results in a decrease in input work requirement for a given mass of delivered air. Derivation for intermediate pressure:
Let T1T1=Initial temperature, T12T21=temperature after 1st stage, T2T2=temperature at entry of 2nd stage after inter cooling, P1P1=Initial pressure P2=IntermediatepressureP2=Intermediatepressure P3P3=Final pressure.
This reduction in temperature means a reduction in internal energy of the delivered air, and since this energy must have come from the input energy required to drive the machine this results in a decrease in input work requirement for a given mass of delivered air.