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If a system is in a stable equilibrium state,its energy is maximum for fixed value of entropy ,the parameters and the amounts of constituents.Im wondering why this is true?Homework EquationsThe Attempt at a Solution

A combined heat and power (CHP) plant consumes 500 MW of exergy of a fuel and can operate in two modes. In mode 1 it produces 300 MW of electricity; hence, it operates with a second law efficiency Pmode1=60%. In mode 2 (CHP) it produces 250 MW of electricity and 200 MW of heat, by heating a...