Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg. The isentropic index is 1.2 and the air intake is at 1 bar, 200 C & RH =65%. i) Find the temperature at the end of the compression. ii) Represent the above process on a p‐v diagram. iii) If the isentropic efficiency is 65%, find the indicated or real work.
Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg. The
isentropic index is 1.2 and the air intake is at 1 bar, 200
C & RH =65%.
i) Find the temperature at the end of the compression.
ii) Represent the above process on a p‐v diagram.
iii) If the isentropic efficiency is 65%, find the indicated or real work.
iv) Find the shaft work needed if the
v) The discharged air is passed through an R134a refrigerant dryer, the temperature of air
coming out the dryer is 400
C. The air then settles inside a reservoir at a temperature of 25
0
C. Determine:
a. The humidity variation throughout the production of compressed air
b. The amount of condensate formed at each stage of the process by using
i. The humidity definition
ii. The Atlas‐copco simplified formula,Compare your results
iii. If the system is in operation 8 hrs per day, 7 day a week; find the amount of
condensate produced for a year.
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