Problem 04.020 - Boundary work for air A piston-cylinder device contains 0.170 kg of air initially at 2 MPa and 350∘C. The air is first expanded isothermally to 500 kPa, then compressed polytropically with a polytropic exponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the boundary work for each process and the network of the cycle. The properties of air are R = 0.287 kJ/kg⋅K and k = 1.4. (Round the final answers to three decimal places. ) (Include a minus sign if necessary. ) The boundary work for the isothermal expansion process is kJ. The boundary work for the polytropic compression process is kJ. The boundary work for the constant pressure compression process is kJ. The network for the cycle is kJ.
