10 Due 4/1

1. Compressed liquid water at 10 MPa and 40$^\circ$C enters a constant pressure steam generator through a 20 mm diameter pipe at the rate of 5 L/s. The water exits the generator at 350$^\circ$C through a pipe of the same diameter. Show in the $Pv$ diagram that the final phase of the water is indeed steam and find the rate of heat transfer to the water. Show a $Pv$ diagram of the process.

2. A stream of 0.3 kg/s of ammonia enters an insulated nozzle at 20$^\circ$C, 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 $Tv$ diagram. Label the lines with their values.

3. An compressor takes in normal nitrogen at 200 kPa, 27$^\circ$C 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.

4. A mixing chamber takes in a stream of R134-a at 1 MPa and 12$^\circ$C and a second stream at 1MPa and 60 $^\circ$C. The first stream has twice the mass flow of the second; $\dot{m}_1=2\dot{m}_2$. No data is given about the stream 3 exiting the mixing chamber. Therefor, you will need to make two approximations typical for mixing chambers. One is that the pressure changes across the chamber are negligible. You are asked to find the exit temperature and the exit quality if it is defined. Construct all phases that are not given in a $Pv$ diagram. Label the lines with their values.