A frictionless piston-cylinder device, shown in Fig. P8-115, initially contains 0.01 m3 of argon gas at 400 K and 350 kPa. Heat is now transferred to the argon from a furnace at 1200 K, and the argon expands isothermally until its volume is doubled. No heat transfer takes place between the argon and the surrounding atmospheric air, which is at 300 K and 100 kPa. Determine (a) the useful work output, (b) the exergy destroyed, and (c) the maximum work that can be produced during this process.

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To 300 K Po 100 kPa Fumace I1200 K Argon 400 K 350 kPa QR FIGURE P8-115