1- A closed system contains 10 kg of water at 100 kPa. The liquid mass is...

 

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1- A closed system contains 10 kg of water at 100 kPa. The liquid mass is 7 kg. Find: a- Quality and specific properties for saturated liquid and saturated vapor (0.3). b- Volume of liquid and vapor. (0.0073 m², 5.082 m³) c- Enthalpy and internal energy. (1094.9, 1043.9 kJ/kg) 2- A vessel having a volume of 5 m² contains 0.05 m³ of saturated liquid water and 4.95 m² of saturated water vapor at 0.1 MPa. Heat is transferred until the vessel is filled with saturated vapor. Determine the heat transfer. (104.9 MJ) 3- A cylinder fitted with a piston has a volume of 0.1 m³ and contains 0.5 kg of water at 0.4 MPa. Heat is transferred to the water until the temperature is 300 °C, while the pressure remains constant. Determine the work and the heat transfer. (91 kJ, 771 kJ) 4- A cylinder with a piston contains steam at 7 bar and 0.9 quality. The steam expands isothermally and reversibly to a pressure of 1.5 bar. The heat supplied during the process is found to be 547 kJ/kg. Sketch the process on T-v diagram and calculate the work done per kilogram of steam. 5- A 0.5 m³ rigid tank contains R134a initially at 160 kPa and 0.4 quality. Heat is transferred to the refrigerant until the pressure reaches 700 kPa. Determine: (a) the mass of the refrigerant in the tank [10.03 kg]. (b) the amount of heat transferred [2707 kJ]. Also, show the process on a t-v diagram. 6- A metal piece of mass 1.8 kg has a temperature of 93 °C falls down in one liter water at temperature of 18 °C. If the final temperature of the system (water + metal piece) is 29 °C, what is the specific heat of the metal piece. (39.95 J/kg.K) 1- A closed system contains 10 kg of water at 100 kPa. The liquid mass is 7 kg. Find: a- Quality and specific properties for saturated liquid and saturated vapor (0.3). b- Volume of liquid and vapor. (0.0073 m², 5.082 m³) c- Enthalpy and internal energy. (1094.9, 1043.9 kJ/kg) 2- A vessel having a volume of 5 m² contains 0.05 m³ of saturated liquid water and 4.95 m² of saturated water vapor at 0.1 MPa. Heat is transferred until the vessel is filled with saturated vapor. Determine the heat transfer. (104.9 MJ) 3- A cylinder fitted with a piston has a volume of 0.1 m³ and contains 0.5 kg of water at 0.4 MPa. Heat is transferred to the water until the temperature is 300 °C, while the pressure remains constant. Determine the work and the heat transfer. (91 kJ, 771 kJ) 4- A cylinder with a piston contains steam at 7 bar and 0.9 quality. The steam expands isothermally and reversibly to a pressure of 1.5 bar. The heat supplied during the process is found to be 547 kJ/kg. Sketch the process on T-v diagram and calculate the work done per kilogram of steam. 5- A 0.5 m³ rigid tank contains R134a initially at 160 kPa and 0.4 quality. Heat is transferred to the refrigerant until the pressure reaches 700 kPa. Determine: (a) the mass of the refrigerant in the tank [10.03 kg]. (b) the amount of heat transferred [2707 kJ]. Also, show the process on a t-v diagram. 6- A metal piece of mass 1.8 kg has a temperature of 93 °C falls down in one liter water at temperature of 18 °C. If the final temperature of the system (water + metal piece) is 29 °C, what is the specific heat of the metal piece. (39.95 J/kg.K)

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D E F Solution Initially the spring is in its relaxed state So the pressure ... View the full answer