a) Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg(gauge pressure). The isentropic index is 1.2 and the air intake is at 1 bar, 20 degrees Celcius & Relative Humidity =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 mechanical efficiency is 75%.

Question

a) Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg(gauge pressure). The isentropic index is 1.2 and the air intake is at 1 bar, 20 degrees Celcius & Relative Humidity =65%.

b)The discharged air is passed through an R134a refrigerant dryer, the temperature of air coming out of the dryer is 40-degree celsius. The air then settles inside a reservoir at a temperature of 25-degree Celcius. Determine the humidity variation throughout the production of compressed air.

c)Determine 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 reasons

iii)If the system is in operation 8hrs per day , 7 day a week , find the amount condensate produced for a year

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