Chapter 6, Problem 6.24P

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A 3 Kg mass of water is heated to a temperature of 99.5 C at 1 bar of pressure.   It is slowly poured into a heavily insulated beaker containing 7.5 Kg of water at a temperature and pressure of 4 C, 1 bar, respectively.  The specific heat of the water, an incompressible material is, c = 4.1 KJ/(Kg K).  The beakers are an adiabatic system.  The two water mass’ reach an equilibrium temperature.  There is no kinetic or potential energy change in this problem. Using the first law determine the final temperature of the water in the beaker. Calculate the entropy production in this process. (Hint: note that this is an incompressible material which means that the density and specific volume are constant)

14. 6.3 kg/s of oxygen undergoes a steady flow process. At inlet state, the reduced pressure is 2 and reduced temperature is 1.3. At the exit state, the reduced pressure is 3 and the reduced temperature is 1.7. Using the generalized compressibility and correction charts, what is the rate of change of total enthalpy for this process? Use co -0.913 kJ/kg K. Express your answer in kW.

Water contained in a closed, rigid tank, initially at 100 lbę/in?, 800°F, is cooled to a final state where the pressure is 40 Ib;/in?. Determine the quality at the final state and the change in specific entropy, in Btu/lb•°R, for the process.

As shown in the figure, 15 kg/s of steam with a velocity of 20 m/s and a thermodynamic state at 30 bar, 320 °C enters a tank where it is mixed with liquid water at 30 bar, 160 °C. As a result, saturated vapor leaves the tank at the same pressure. Kinetic and potential energy effects and heat transfer between the tank and its surroundings can be neglected. Determine a) The mass flow rate of liquid water, in kg/s. b) Cross-sectional area of the inlet line of superheated steam, in m². c) Entropy production rate in the process, in kW/K.

4-99 Refrigerant 134a enters the fash chamber operating at steady state shown in Fig. P499 at 10 bar, 36°C, with a mass flow rate of 482 kg/h. Satoratcd liquid and saturated vapor cul as separate streams, each at pressure p. eat transfer to The surroundings and kinetic and potential energy effects can be ignored. (a) Determine the mass flow rates of the exiting streams, cach in ke/b. if o -4 bar. (b) Plot the mass fow rates of the cxiting streams, cach in vetsprangng from l to 9 bar. Velve Saturated vapor pressureP

Q7/ Calculate the mass, in kg, of I m' of a two-phase liquid- vapor mixture of Refrigerant 22 at 1 bar with a quality of 75%.

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Its for Thermodynamics