A steam engine isentropically expands 5 kg/sec of steam from 0.68 MPa, 220 degrees celcius . The exhaust is dry and saturated. Determine: (a) the initial and final temperatures (b) the work of a steady and nonflow processes

2 kg of Refrigerant-134a contained in a piston-cylinder device undergoes a reversed Carnot cycle. Some important information about the cycle is: ● At the beginning of the adiabatic compression (State 1), the refrigerant is a saturated vapor. ● The adiabatic compression ends when the temperature of the refrigerant is 30 degrees C● The refrigerant is 50% vapor by mass at the end of the isothermal heat rejection process. ● The adiabatic expansion process ends when the pressure of the refrigerant is 132.82kPaConsulting example 7-6 in your text might be helpful in understanding some aspects of this problem. a) Represent this cycle on a T-S diagram. On your diagram, clearly indicate the values of the specific entropy and temperature at every state. b) Explain (briefly) why the process curves take the shapes you indicated on your T-S diagram in part a.

Steam at 350 °C , 10 bar is expanded through an adiabatic nozzle to 250 °C and 5 bar. Neglect the inlet kinetic energy of the steam. 1.Determine the velocity of exiting steam, 50 m below the inlet. 2.Calculate the degrees of superheat of the exiting steam.