Question

A piston-cylinder device contains 1.15 kg of air initially at 2441 kPa and 379 oC. The air is first expanded isothermally to 470 kPa, then compressed polytropically with a polytropic exponent of 1.7 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the net work of the cycle Net work kJ A pistoo-cylinder deuice contains 0.45 kg ofair ity at 2°us kPa and 318 c. The air is first expanded iiethermally to 465kfe, then compressel pel tropicaily with a pohtrupic to the initial pressure, and finallg compressd at the constant pressureto the intial state. Determine the net work of the cle. PV。mAT expenent o 208 kPa. = O. 04191m, 465 0-0419 y"- For pol tropic process Pav1.9-y3.9 V. Format answer: -528.29

Answer 1

Solution Gien dal mass (m) : I-ISkg T : 33% (379+223 ) k - (Q.iS) (0 287(S2) 2.

2-3 (244) (0.כן3(-)470()0.457) - 296 z I Coslant premue compzemiou procen: (3-1) 나 207, 24kf u)