CHE 433: THERMODYNAMICS

TUTORIAL 2

TOPIC: PROPERTIES OF PURE SUBSTANCES

1. By using Appendix A in the text book, complete this table for H2O

T, oC P, kPa v, m3/kg Phase description

50 4.16

200 Saturated vapour

250 400

110 600

2. By using Appendix A in the text book, complete this table for refrigerant-134a

T, oC P, kPa v, m3/kg Phase description

-8 320

30 0.015

180 Saturated vapour

80 600

3. By using Appendix A in the text book, complete this table for H2O

T, oC P, kPa h, kJ/kg x Phase

description

200 0.7

140 1800

950 0

80 500

800 3162.2

4. One kilogram of water fills a 0.140 m3 rigid container at an initial pressure of 1.8 MPa.

The container is then cooled to 40 oC. Determine the initial temperature and final

pressure of the water (By using steam table).

5. Three kilograms of water in a container have a pressure of 100 kPa and temperature

of 360oC. Find the volume of this container.

6. One kilogram of R-134a fills a 0.14 m3 weighted piston-cylinder device at a

temperature of -26.4 oC. The container is now heated until the temperature is 100 oC.

Determine the final volume of the R-134a.

7. 4 kg of steam contained in a 500 L rigid tank was initially at 250oC. Then the tank

was cooled to 80oC.

(a) State the initial phase of the system and give your reason.

(b) Sketch the process on a T-v diagram with respect to saturation lines.

(c) Determine the pressure (in kPa) at which condensation first occurred.

(d) Determine the mass of liquid water (if any) at final state

8. A 1 m3 rigid tank with air at 1 MPa and 400 K is connected to an airline. The valve is

opened and air flows into the tank until the pressure reaches 5 MPa. The valve is

closed and the temperature inside the tank is 450 K. The tank is then cooled to 300

K. Determine the final pressure inside the tank.

9. Saturated water vapour at 350 oC is heated at constant pressure until its volume has

doubled. Determine the final temperature using the ideal gas equation of state

10. Refrigerant-134a at 0.7 MPa has a specific volume of 0.033322 m3/kg. Determine the

temperature of the refrigerant based on the ideal gas equation.

11. A 0.5 m3 rigid tank containing hydrogen at 20 oC and 600 kPa is connected by a

valve to another 0.5 m3 rigid tank that holds hydrogen at 30 oC and 150 kPa. Now the

valve is opened and the system is allowed to reach thermal equilibrium with the

surroundings which are at 15oC. Determine the final pressure in the tank.

Hydrogen

0.5 m3

20 oC

600 kPa

Hydrogen

0.5 m3

30 oC

150 kPa