Determine the heat loss or gain during this process.

| January 30, 2015

A piston–cylinder device contains helium gas initially at 150 kPa, 20°C, and 0.5 m3. The helium is now compressed in a polytropic process (PVn = constant) to 400 kPa and 140°C. Determine the heat loss or gain during this process.

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FIGURE P4–120

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determine the ratio of the maximum to minimum pressures in the cycle.

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