Water enters the constant 120-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 85 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate.

Steam enters the condenser of a steam power plant at 20000 kPa and a quality of 95 percent with a mass flow rate of 20 Mg/h. It is to be cooled by water from a nearby river in circulating the water through the tubes within the condenser. To prevent thermal pollution, the river water is not allowed to experience a temperature rise above 10°C. If the steam is to leave the condenser as saturated liquid at 20000 Pa, determine the mass flow rate of the cooling water required. m = 20,000 kg/h P = 20 kPa = 0.95 %3D Steam Water T+ 10°C P = 20 kPa Sat. liquid

Steam enters an adiabatic nozzle at 0.6 MPa and 400°C with a velocity of 50 m/s and exits at 0.15 MPa and 400 m/s.  Find the exit temperature

Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the refrigerant.