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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
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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
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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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