Refrigerant 134a at a flow rate of 0.5 lb/s enters a heat exchanger in a refrigeration system operating at steady state as saturated liquid at 08F and exits at 208F at a pressure of20 lbf/in.2 A separate air stream passes in counterflow to theRefrigerant 134a stream, entering at 1208F and exiting at778F. The outside of the heat exchanger is well insulated.Neglecting kinetic and potential energy effects and modelingthe air as an ideal gas, determine the mass flow rate of air,in lb/s.

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.