5. A rigid vessel contains 5 kg of wet steam at 0.4 MPa. After the addition of 9585 kJ the steam has a pressure of 2.0 Mpa and a temperature of 700°C. Determine the initial internal energy and the specific volume of the steam.
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5. A rigid vessel contains 5 kg of wet steam at 0.4 MPa. After the addition of 9585 kJ the steam has a pressure of 2.0 Mpa and a temperature of 700°C. Determine the initial internal energy and the specific volume of the steam.
Ans. 1553.9kJ/kg, 0.2258 m3/kg.
6. A 1-kg steam-water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and the temperature to 400°C. Determine the heat added.
Ans. 1378.7 kJ
7. Water vapor at 100 kPa and 150°C is contained in a rigid vessel. At what temperature will the vapor start to condense when the container is cooled slowly? How much heat will have to be removed per kilotram in this cooling process?
Ans. 95.68°C, -81.4 kJ/kg
8. Water at 2.5 MPa and 200°C is heated at constant temperature up to a quality of 80%. Find (a) the quantity of heat received by the water, (b) the change in internal energy, and (c) the work of a nonflow process.
Ans. (a) 2025.7 kJ/kg; (b) 1396.5 kJ/kg; (c) 629.17 kJ/kg
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