3-134 A 300-m3 rigid tank is filled with saturated liquid- vapor m...

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3-134 A 300-m3 rigid tank is filled with saturated liquid- vapor mixture of water at 200 kPa. If 25 percent of the mass is liquid and 75 percent of the mass is vapor, the total mass in the tank is (a) 451 kg (b)556kg (c) 300 kg (d) 331 kg (e) 195 kg 3-135 Water is boiled at 1 atm pressure in a coffee maker equipped with an immersion-type electric heating element. The coffee maker initially contains 1 kg of water. Once boil- ing started, it is observed that half of the water in the coffee maker evaporated in 10 minutes. If the heat loss from the cof- fee maker is negligible, the power rating of the heating ele- ment is (a) 3.8 kW (b) 2.2 kW (c) 1.9 kW (d) 1.6 kW (e) 0.8 kW 3-136 A 1-m³ rigid tank contains 10 kg of water (in any phase or phases) at 160°C. The pressure in the tank is (a) 738 kPa (b) 618 kPa (c) 370 kPa (d) 2000 kPa (e) 1618 kPa 3-137 Water is boiling at 1 atm pressure in a stainless steel pan on an electric range. It is observed that 2 kg of liquid water evaporates in 30 min. The rate of heat transfer to the water is (a) 2.51 kW (b) 2.32 kW (c) 2.97 kW (d) 0.47 kW (e) 3.12 kW 3-138 Water is boiled in a pan on a stove at sea level. During 10 min of boiling, it is observed that 200 g of water has evaporated. Then the rate of heat transfer to the water is (a) 0.84 kJ/min (b) 45.1 kJ/min (c) 41.8 kJ/min (d) 53.5 kJ/min (e) 225.7 kJ/min 3-28 A 1.8-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 (a) the pressure of the steam, (b) the quality of the saturated mixture, and (c) the density of the mixture. Steam 1.8 m3 220°C FIGURE P3-28 3-31 10-kg of R-134a fill a 1.348-m³ rigid container at an initial temperature of -40°C. The container is then heated until the pressure is 200 kPa. Determine the final temperature and the initial pressure. Answers: 66.3°C, 51.25 kPa 3-38 Three kilograms of water in a container have a pres- sure of 100 kPa and temperature of 150°C. What is the vol- ume of this container? 3-43 Water initially at 200 kPa and 300°C is contained in a piston-cylinder device fitted with stops. The water is allowed to cool at constant pressure until it exists as a satu- rated vapor and the piston rests on the stops. Then the water continues to cool until the pressure is 100 kPa. On the T-V diagrams sketch, with respect to the saturation lines, the process curves passing through both the initial, intermedi- ate, and final states of the water. Label the T, P and V values for end states on the process curves. Find the overall change in internal energy between the initial and final states per unit mass of water. Water 200 kPa Q 300°C FIGURE P3-43 3-44 Saturated steam coming off the turbine of a steam power plant at 40°C condenses on the outside of a 3-cm- outer-diameter, 35-m-long tube at a rate of 130 kg/h. Deter- mine the rate of heat transfer from the steam to the cooling water flowing through the pipe. 3-51 A piston-cylinder device contains 0.005 m³ of EES liquid water and 0.9 m³ of water vapor in equi- librium at 600 kPa. Heat is transferred at constant pressure until the temperature reaches 200°C. (a) What is the initial temperature of the water? (b) Determine the total mass of the water. (c) Calculate the final volume. (d) Show the process on a P-v diagram with respect to satura- tion lines. 3-84 Determine the specific volume of superheated water vapor at 3.5 MPa and 450°C based on (a) the ideal-gas equation, (b) the generalized compressibility chart, and (c) the steam tables. Determine the error involved in the first two cases.

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