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Five kg of carbon dioxide gas undergoes a process in a well insulated piston-cylinder assembly from 2 bar, 280K to 20 bar, 520K. If the carbon dioxide behaves as an ideal gas, determine the amount of entropy produced in kJ/K assuming:
a) constant specific heats with Cp=0.939 kJ/Kg K.
b) variable specific heats.
Steam at 15 bar and 350 degrees C is expanded through a 50% reaction turbine to a pressure of 0.14 bar. The stage efficiency is 80% for each stage and the reheat factor is 1.05.
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consider entropy balance equation for human engines. humans loose heat at the rate of 80 w from the body which is
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