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# ass5 - ENGRD221: ProblemSet5...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 5 Due February 27 th , 2009 (5 Questions) Question 1 (4.102): A simple steam power plant operates at steady state with water circulating through the components with a mass flow rate of 60kg/s. Figure 1 shows additional data at key points in the cycle. Stray heat transfer and kinetic and potential effects are negligible. Determine (a) the thermal efficiency and (b) the mass flow rate of cooling water though the condenser, in kg/s. Figure 1 Question 2 (5.18): A power cycle receives energy Q H by heat transfer from a hot reservoir at T H =1500 o R and rejects energy Q C by heat transfer to a cold reservoir at T c = 500 o R. For eash of the following cases, determine whether the cycle operates reversibly, irreversibly, or is impossible. (a) Q H = 900 Btu, W cycle = 450 Btu (b) Q H = 900 Btu, Q C = 300 Btu (c) W cycle = 600 Btu, Q C = 400 Btu (d) η cycle = 70%

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Question 3 (5.25): As shown in Figure 2, two reversible cycles arranged in series, each produce the same net work, W cycle . The first cycle receives energy Q H
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