OldExam3 - and has rejected heat to a small lake at 20C....

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1 ME 201 Thermodynamics Old Exam #3 Directions: Work all three (3) problems. The exam is open notes and open text book. All problems have equal weight. Problem 1 An inventor claims to have designed a heat exchanger system that operates with air entering at 350 kPa, -17°C, and 0.05 kg/s and is heated to 70°C. Refrigerant-12 enters the other side as saturated vapor at 1.2 MPa at a rate of 0.25 kg/s. Determine the validity of this claim. Problem 2 For several years a power plant has produced 500 MW of work from steam at 800°C
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Unformatted text preview: and has rejected heat to a small lake at 20C. For ecological reasons, the department of natural resources has asked for a 10% reduction in this heat rejection. How can this be accomplished and still maintain a power output of 500 MW? It may be reasonable to assume that the power plant operates as a Carnot cycle. Problem 3 What does irreversibility imply about an adiabatic steam turbine which operates with inlet steam at 10 MPa and 700C and exhausts at 0.2 MPa with a quality of 90%....
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