ChemE 3130 prelim 1 study problem set

# ChemE 3130 prelim 1 study problem set - ChemE 3130 Chemical...

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ChemE 3130 – Chemical Engineering Thermodynamics Review Problems for Prelim 1 (1) Rankine cycle A Rankine power generation cycle with steam as the working fluid operates at a temperature of 100 o C in the condenser, a pressure of 3MPa and temperature of 600 o C in the boiler. Assuming the pump and the turbine operate adiabatically. (a) plot the cycle on the T-S diagram for steam. (b) Calculate the efficiency of the cycle.

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(2) Turning glacial melting into a profit . The glaciers are melting and a clever business person wants to turn this phenomenon into a profit. Let’s determine how much we can gain by melting our ice caps. Assume you can take ice from the Antarctic, put it into closed containers with negligible mass and melt it in the ocean. The ocean represents an infinite heat reservoir at 20˚C. First, the ice melts ( Δ h fusion = 334kJ kg -1 ) and eventually equilibrates with the rest of the ocean at 20˚C. (c P =4.18 kJ kg -1 K -1 ) (a) Calculate the entropy change of the surroundings and the water per kg of ice melted. Use the total entropy change to verify that
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