Nitrogen (N2) at 25 bar, 450 K enters a turbine and expands to 2 bar, 250 K with a mass flow rate of 0.2 kg/s. The turbine operates at steady state with negligible heat transfer with its surroundings. Assuming the ideal gas model with k 5 1.399 and ignoring the effects of motion and gravity, determine (a) the isentropic turbine efficiency. (b) the exergetic turbine efficiency. Let T0 5 258C, p0 5 1 atm.

Controls of Dynamic Systems:ME 4334 (Tues&Thurs 2-3:20 Dr. Zhang) • Homework is Based from the Textbook. Course Website: Blackboard. [Will post homework, old quizzes and test.] Grades: • Homework 10% (Given Tuesday and due the next. Will be given the solutions.) • Quizzes 15% (Can have an equation sheet and will be every Thursday.) • Midterms 50% (3 exams.) • Final Exam 25% >There won't be a curve. Review of Dynamic Models: (Ch 1, Ch 2.2) What is a dynamic system • Steps of Controlling Systems. Feedforward is simpler while feedback is more accurate.