In the boiler of a power plant are tubes through which water flows as it is brought from 0.8 MPa, 150C to 240C at essentially constant pressure. The total mass flow rate of the water is 100 kg/s. Combustion gases passing over the tubes cool from 1067 to 547C at essentially constant pressure. The combustion gases can be modeled as air as an ideal gas. There is no significant heat transfer from the boiler to its surroundings. Surrounding (dead state) temperature and pressure are given as 25C and 1 atm, respectively. Determine (a) the mass flow rate of the combustion gases (in kg/s), (b) the rate of exergy destruction (in kW), (c) the exergetic efficiency (the second law efficiency) of the boiler.
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The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.
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In the boiler of a power plant are tubes through which water flows as it is brought from 0.8 MPa, 15...
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