Determine the entropy change for each of the three processes comprising the cycle described in…

Determine the entropy change for each of the three processes comprising the cycle described in problem 3.14.

Problem 3.14

Ten kilograms of air is compressed at a constant temperature of 300°K during process 1-2 from an initial pressure of I bar to a final pressure of 3 bars. Process 2-3 is a constant pressure heating which ends in a gas volume V3 equal to the starting volume V1. Use the perfect gas equation of state to find V1 and T3. Use the air tables to determine specific enthalpies at states I, 2 and 3. The gas constant for air is 286.8 /kg-°K. 115 A supersonic wind tunnel uses compressed nitrogen from a large storage tank, having a volume of 1700 cubic feet, to create high speed flow in the test section of the tunnel. The nitrogen is stored at 100°F and 500 psia. Use the tables to determine the value of the compressibility factor Z for the compressed gas. Determine the specific volume of the stored nitrogen and the mass of gas in the tank.

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