It is necessary to provide a nitrogen stream at 80oC and a pressure of 6 bar. The source of the nitrogen is at 200oC and 1.2 bar . determine the work and cooling duty required for three alternative.

a. compress ini a single compression stage and cool the compressed gas.

b. cool the feed gas to 80oC and then repeat part (a)

c. repeat part (b), exept use two stage of compression with an intercooler

d. identify any conditions of special concern that occur.

Nitrogen can be treated as an ideal diatomic gas for this comparison. Use as a basis 1 kmol of nitrogen and assume that the efisiensi, ε , of each stage of compression is 70 %

For ideal diatomic gas: Cp= 3,5R, Cv = 2,5R γ=cpcv

=1,4 ,R 8.314 kj/kmol K, and assuming

an efficiency, ε = 0.70

Ctrl B : Basis Environment