Compressed liquid water at 10 MPa and 40C enters a constant
pressure steam generator through a 20 mm diameter pipe at the rate
of 5 L/s. (Use the pipe area to relate this volumetric flow rate to
velocity, and the specific volume to relate it to mass flow.) The
water exits the generator at 350C through a pipe of the same
diameter. Show in the diagram that the final phase of the water
is indeed steam and find the rate of heat transfer to the water.
Show a diagram of the process.
UNGRADED: A stream of 0.3 kg/s of ammonia enters an insulated
nozzle at 20C, 800 kPa as superheated vapor at negligible
velocity. The ammonia exits at 300 kPa with a velocity of 450 m/s.
Determine the temperature (or quality, if saturated) and the exit
area of the nozzle. Construct all phases that are not given in a
diagram. Label the lines with their values.
An compressor takes in normal nitrogen at 200 kPa, 27C and
sends it at 1000 K and 2 MPa into a heat exchanger. It exits the
heat exchanger at 300 K. Find the specific work done by the
compressor and the specific heat removal in the heat exchanger.
Make an appropriate approximation for the type of process in the
compressor and another for the one in the heat exchanger. Both
assumptions are listed in the table in the book. Assume that
nitrogen is an ideal gas.
A turbine takes in 2 kg/s neon at 27C and 200 kPa with
negligible velocity. The produced work is 75 kW and 30 kW of heat
leaks into the turbine from the surroundings. The neon exits at 100
kPa and 230 K. Find the exit velocity of the neon.