Water vapor enters the tub with an inlet cross section of 0.02 m2 at 20 bar pressure and a density of 7 kg / m3. The mass flow of water vapor is 4 kg / s, and its internal energy comes out as 2500 kJ / kg at a pressure of 14 bar from the nozzle. Since the heat transfer to the environment is 10 kW, calculate the exit velocity of the water vapor from the nozzle?

A nozzle operates with steam entering at 700 kPa and 300 °C. The velocity at the inlet is 30 m/s. As the steam flows through the nozzle, the pressure decreases. Determine the area ratio value (Area / Area inlet), where Area inlet is the cross sectional area of the nozzle at the inlet, at the sections of the nozzle where the pressure values are 650, 550, 450, 350, and 250 kPa. Assume nozzle operates isentropically.

Steam (water vapor) enters a stainless steel tube with inner diameter 4cm at 300°C and 60 bar absolute pressure, with a velocity of 8.00 m/s.  The steam exits the tube at 300°C and 40 bar absolute pressure. a. Assuming the water vapor behaves as an ideal gas, calculate the steam mass flow rate and the change in kinetic energy (in Watts). b. Using the specific volume values from table B.7, calculate the steam mass flow rate and the change in kinetic energy (in Watts).

Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 150000 W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the total rate of entropy production. Calculate the total rate of exergy destruction (W)  The dead state temperature is 293.2 K and pressure is 1 bar.

The feed to a compressor is superheated steam at 310°C and 40 bar. It enters the compressor at a velocity of 17 m/s. The pipe inlet inside diameter is 0.25 m. The discharging pipe, after the compressor, has a smaller inside diameter and the discharge velocity is 120 m/s. The exit of the compressor is superheated steam at 350°C and 85 bar absolute. Heat loss from the compressor to the surroundings is 3 kW. Determine the compressor horsepower

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Air at 2.50 kg/m3 enters a nozzle that has an inlet-toexit area ratio of 2:1 with a velocity of 120 m/s and leaves with a velocity of 330 m/s. Determine the density of air at the exit.

In a centrifegal compressor air flows steadily at a rate of 2,1 kg/s and 81,00m/s with a pressure of 90kpa and specific volume of 0,85cubic meter per kilograms. The exit condtions are: speed 200m/s, pressure 900kpa and specific volume of 0,13cubic meter per kilograms. The internal energy of the air at exit is 90kj/kg greater than that of the air at inlet. Heat is loss during compressor at the rate of 95kj/s. Calculate the following;  (a) power required to drive the compressor (b) Diameter of the inlet and outlet pipes?

Steam enters a turbine with a pressure of P1= 4888 kPa, specific internal energy u1= 3612 kJ/kg, mass flow rate of 7.5kg/s and density of 1.112 kg/m3. Steam leaves at P2 = 224 kPa with a density of 4.5kg/m3 and a specific internal energy of u2= 1224 kJ/kg. Heat loss from the device by radiation is 50KJ/kg. Neglecting the changes in kinetic and potential energies, determine the power produced by the system.

2. Air whose density is 0.078 enters the duct of an air-conditioning system at a volume flow rate of 450 ft3 /min. If the diameter of the duct is 10 in, determine the velocity of the air at the duct inlet and the mass flow rate of air.