Chapter 6, Problem 6.99P

QUESTION 19 The mass of CO2 is 0.066 kg in a system (with molar mass 44 kg/kmol), occupying a volume of 0.026 m³ at 0.9 bar is compressed reversibly until the pressure is 5.33 bar. If the molar (universal) gas constant as 8.3145 kJ/kmol K, calculate the final temperature (in C) when the process is isothermal. Answer to 3 d.p. No need for unit

Carbon Oxide (CO) initially occupying 1.8 m3 at 5.2 bar, 246.85°C undergoes an internally reversible expansion during whichpV1.4 = constant to a final state where the temperature is 36.85°C. Assuming the ideal gas model, determine the entropy change, in Joules/K.

Steam at a pressure of 21 bar and a dryness fraction of 0.9 occupies a volume of 0.427 m' in a cylinder behind a piston is allowed to expand reversibly to a pressure of 7 bar according to the relationship, PV1.25 = Constant. Sketch the process on the p-v diagram and calculate the work and heat transfers in kJ. %3D

Plot the processes described on a PV diagram. Properly label the state points 1, 2, 3 ... and so on toindicate the correct sequence of the described changes in state.

A vessel of volume 0.04 m3 contains a mixture of saturated water and steam at a temperatureof 250°C. The mass of the liquid present is 9 kg. Find the pressure, mass, specific volume,enthalpy, entropy and internal energy.

Three-tenths kmol of carbon monoxide (CO) in a piston- cylinder assembly undergoes a process from p1 = 150 kPa, T1 = 300 K to p2 = 500 kPa, T2 = 370 K. For the process, W = -300 kJ. Employing the ideal gas model, determine: (a) the heat transfer, in kJ. (b) the change in entropy, in kJ/K. Part A Employing the ideal gas model, determine the heat transfer, in kJ. kJ Save for Later Attempts: 0 of 1 used Submit Answer Part B The parts of this question must be completed in order. This part will be available when you complete the part above.

At steady state, air at 200 kPa, 51.85°C and a mass flow rate of 4.02 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. At the duct exit, the pressure of the air is 100 kPa, the temperature is 82°C, the velocity is 255 m/s, and the cross-sectional area is 2 x 10-3 m2. Assuming the ideal gas model, determine the rate of entropy production within the duct, in W/K.

Refrigerant 134a at 15 oC, 1.8 bar, and a mass flow rate of 5 kg/min enters an insulated compressor operating at steady state and exits at 5 bar. The isentropic compressor efficiency is 77%. Neglect the changes in kinetic and potential energies and assume the surroundings to be at 25 °C.Determine:S 1.1  the temperature of the refrigerant exiting the compressor, 1.2  the power input to the compressor, in kW, and 1.3  the rate of exergy destruction, in kW.

Suppose that 0.27 kg of water is contained in a vertical cylinder/piston arrangement as a 2 phase mixture at 50°C. Initially the volume beneath the 125 kg piston (area of 8.77 cm2) is 0.03 m^3. With the atmospheric pressure of 101.325 kPa (g = 9.81 m/s^2), the piston is resting on the stops. Energy is transferred to this arrangement until the piston rises from the stops. a) What is the temperature of the water when the piston first rises from the set of stops? b) What is the temperature at which the system reaches the saturated vapor state? c) Show the process on a T-v diagram and label the known states on the diagram.