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TRC2200 Thermo-fluids (Thermodynamics component)

Test 2013

Name:________________________

ID Number:___________________

Question 1a

a) A piston–cylinder device initially contains 50 L of liquid water at 40°C and 200 kPa. Heat is

transferred to the water at constant pressure until the entire liquid is vaporized.

(I) What is the mass of the water? [4 marks]

(II) What is the final temperature? [4 marks]

(III) Determine the total enthalpy change. [4 marks]

(IV) Show the process on a T-v diagram with respect to saturation lines. [3 marks]

Seat No:

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Question 1b [15 Marks]

Air enters an adiabatic nozzle steadily at 300 kPa, 200°C, and 30 m/s and leaves at 100 kPa and

180 m/s. The inlet area of the nozzle is 80 cm2. Determine: (I) the mass flow rate through the

nozzle, (II) the exit temperature of the air, and (III) the exit area of the nozzle.

[15 marks]

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Properties Table

4

5

6

7

8

9

Superheated water (continued)

10

11

12

13

14

15