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# ass7 - ENGRD 221 Engineering Thermodynamics Problem Set 7...

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ENGRD 221: Engineering Thermodynamics Problem Set 7 Due: March 13 th 2009, Upson Room 123 (5 Questions) Problem 1 (6.84): By injecting liquid water into superheated steam, the desuperheater show in Figure 1 has a saturated vapor stream at its exit. Steady-state operating data are provided in the accompanying table. Stray heat transfer and all kinetic and potential energy effects are negligible. (a) Locate states 1, 2, and 3 on a sketch of the T-s diagram. (b) Determine the rate of entropy production within the desuperhater, in kW/K. State P (MPa) T ( o C) ν x10 3 (m 3 /kg) u (kJ/kg) h (kJ/kg) s (kJ/kg K) 1 2.7 40 1.0066 167.2 169.9 0.5714 2 2.7 300 91.01 2757.0 3002.8 6.6001 3 2.5 Sat. vap. 79.98 2603.1 2803.1 6.2575 Figure 1 Problem 2 (6.88): Air at 400 kPa, 970 K enters a turbine operating at steady state and exits at 100kPa, 670 K. Heat transfer from the turbine occurs at an average outer surface temperature of 315 K at the rate of 30 kJ per kg of air flowing. Kinetic and potential energy effects are negligible. For air as an ideal gas with c p =1.1 kJ/kg K, determine (a) the rate power is developed, in kJ per kg

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