Refrigerant-134a is expanded isentropically from 600 kPa and 70°C at the inlet of a steady-flow turbine to 100 kPa at the outlet. The outlet area is 1 m2 , and the inlet area is 0.5 m2 . Calculate the inlet and outlet velocities when the mass flow rate is 0.75 kg/s.

Methane at 2760 kPa and -6.31 °C is compressed in steady-state adiabatic compressor (85% efficient) to 11.5 MPa and 251 °C. Determine : (a) How many kW are required if the flow is to be 17.5 kmol/hr (b) The rate entropy generation in Joules per second and degrees K.

A gas-turbine power plant is to produce 800 kW of power by compressing atmospheric air at 20 0C to 800 kPa. If the maximum temperature is 800 0C, calculate the minimum mass flux (mass flow rate) of the air.

Air enters the compressor of a gas turbine plant at ambient conditions of 100 kPa and 25 °Cwith a low velocity and exits at 1 MPa and 347 C with a velocity of 90 m/s. The compressionprocess is adiabatic, and the power input is 200. Determine the mass flowrateof the air through the compressor.