Given the power plant below. Thermal energy Q H at T H is generated from combust

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Given the power plant below. Thermal energy Q H at T H is generated from combustion of fossil fuels in a furnace. The energy is transferred to the steam at TH2 in the furnaces' tubes. A portion of the thermal energy is converted to mechanical energy W net in the reversible heat engine. The furnace's heat transfer irreversibility (finite temperature heat transfer in the furnace) reduces the thermal efficiency. The power plant rejects thermal energy to T L, the environment temperature. Drawing a control volume including a small portion of the thermal reservoir TH1, the thermal reservoir TH2, the heat engine, and a small portion of the thermal reservoir T L, show that the overall thermal efficiency can be expressed as where Delta T H = TH1 - TH2. Plot the cycle efficiency versus Delta T H/TH1 with TH1 and T L are at 483 C and 20 C, respectively. Let 0 Delta T H 240C . The heat transfers per unit mass Q H and Q L are 3248 kJ/kg and 2410 kJ/kg, respectively. Determine the total entropy generated per unit mass [kJ/kg-K] from transferring the thermal energy from TH1 to T L for T H2 = 242 C. Determine the second law efficiency for the system. Determine the lost available work per unit mass for the system [kJ/kg].

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