A piston‑cylinder device initially contains 0.2 m3 of helium at 100 kPa and 25C. The helium...

A piston‑cylinder device initially contains 0.2 m3 of helium at 100 kPa and 25C. The helium is then compressed during a polytropic process (Pvn = constant). The final pressure is 270 kPa and the final temperature is 150C. Determine (a) the mass of the helium (kg), (b) the final volume (m3), (c) the poly tropic exponent n, (d) the work for the compression process (kJ), and (e) the heat transfer (kJ).

Expert Solution

samet mamat answered 4 months ago

Prob. 4-68 A piston–cylinder device contains 2.2 kg of nitrogen initially at 100 kPa and 25C....

Prob. 4-68 A piston–cylinder device contains 2.2 kg of nitrogen initially at 100 kPa and 25C. The nitrogen is now compressed slowly in a polytropic process during which PV^1.3 = constant until the volume is reduced by one-half. Determine the work done and the heat transfer for this process. 4–69 Reconsider Prob. 4–68. Using EES (or other) software,plot the process described in the problem on a P-V diagram, and investigate the effect of the poly- tropic exponent n on the boundary...

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