A sealed rigid tank contains 5.0 kg of water (liquid plus vapor) at 100 oC with...
A well-insulated rigid tank contains 2 kg of a saturated liquid-vapor mixture of water at 100 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. Answer: 8.10 kJ/K Analysis From the steam tables (Tables A-4 through A-6)
A rigid tank having a volume of 0.1 m3 initially contains water as a two-phase liquid-vapor mixture at 1 bar and a quality of 1%. The water is heated in two stages: Stage 1: Constant-volume heating until the pressure is 20 bar. (treat as closed system) Stage 2: Continued heating while saturated water vapor is slowly withdrawn from the tank at a constant pressure of 20 bar. (Note: Use transient analysis with all the water leaving having a quality of...
In a well-insulated rigid tank which contains 2 kg of a saturated liquid-vapor mixture of water at 200 kPa, 40% of the mass is in the liquid phase. A heater is providing heat to the content of the tank so that all liquid phase converts to vapor phase. Calculate the entropy change of water in this process.
A well-insulated rigid tank contains 5.80 kg of a saturated liquid-vapor mixture of water at 225 kPa. Initially, one-quarter of the mass in the liquid phase. An electric resistor placed in the tank is connected to 240-V source, and a current of 6 A flows through the resistor when the switch is turned on. Determine how long it will take to vaporize all the liquid in the tank in minute.
A 160 m3 rigid tank is filled with saturated liquid-vapor mixture of water at 50oC. 70% of the mass is vapor and the 30% of the mass is liquid. The mixture is then heated until its pressure is 50kPa. Determine the final temperature(oC).
A sealed rigid tank has 0.1 kg saturated vapor R-410a at 0°C that is cooled to 20°C by a 20°C heat sink. Thermodynamic properties of R410a at initial and final states are given as: u1 = 253.02 kJ/kg, 51 -1.0368 kJ/kg.k ; u2 - 136.5 kJ/kg; 52 - 0.5946 kJ/kg.K .. Find the heat transfer during the cooling process. b. Calculate the change in entropy of the R-410a c. Determine the change in entropy of heat sink, a. Estimate the...
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Problem 2 (50 points) A closed rigid tank contains of a two-phase liquid-vapor mixture of water, with a mass of 1 kg quality of x,-0.75, and a pressure of pi = 40 kPa (State 1 ). The system is heated in a constant- volume process till the pressure reaches p2-100 kPa (State 2) Sa) Determine the temperature, T, in "C, specific volume, Pi in m'/kg, and specific internal energy, ul, in kJ/kg at state 1; (12.5 points)...
A rigid tank contains 125,0 kg of saturated water vapor at 245 °C. Determine : a. The pressure b. The internal energy in kJ c. The volume of the rigid tank.
Pressure in tank = 2320 kPaQuality of saturated mixture = 0.0269A 9.8 m3 rigid tank contains steam at 220°C. One-third of the volume is in the liquid phase and the rest is in the vapor form. Determine the density of the mixture. (Round the final answer to one decimal place.) (You must provide an answer before moving on to the next part.) The saturated water-temperature table (in Sl units) is given below.The density of the mixture is _______ kg/m3
An insulated rigid tank initially contains 5 lb of saturated liquid water-vapor mixture at 40 psia with three-quarters of the mass in the liquid phase. An electric resistance heater placed in the tank is turned on until all of the liquid is vaporized. Calculate (a) the exergy destroyed, and (b) the second law efficiency.