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Sample_Problems_2

# Sample_Problems_2 - Engi2800 Engineering Thermodynamics I...

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Sample Problems #2 (Chapter 3) Ismet Ugursal, J.M. Chuang Dalhousie University Dept. of Mechanical Engineering September 7, 2009 Engi2800 Engineering Thermodynamics I

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Problems (Textbook 7 th Ed.) Questions Page Topics 3.52 80 General Tables 3.75 82 Ideal Gas 3.80 82 Ideal Gas 3.94 83 Ideal Gas 3.113 84 Equation of State
Prob. 3.52 General Tables Two tanks are connected as shown in Figure, both containing water. Tank A is at 200 kPa, , and tank B contains 3.5 kg at 0.5 MPa, 400°C. The valve is now opened and the two come to a uniform state. Find the final specific volume. Solution: Control volume: both tanks. Constant total volume and mass process. AB sup. vapor State A1: State B1: Table B.1.3 (see Slide #4) Final state: ( P; T ) v = 0 : 5 m 3 = kg V A = 1 m 3 ( P; v ) m A = V A =v A = 1 = 0 : 5 = 2 kg v B = 0 : 6173 m 3 = kg = ) V B = m B v B = 3 : 5 £ 0 : 6173 = 2 : 1606 m 3 V tot = V A + V B = 3 : 1606 m 3 P A = 200 kPa v A = 0 : 5 m 3 kg V A = 1 m 3 P B = 0 : 5 MPa m B = 3 : 5 kg T B = 400 o C v 2 = V tot =m tot = 0 : 5746 m 3 = kg m tot = m A + m B = 5 : 5 kg

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v (400 o C ; 0 : 5 MPa) 400 o C 500 kPa p. 785
Prob. 3.75 Ideal Gas Air in an automobile tire is initially at −10°C and 190 kPa. After the automobile is driven

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