Chapter 8, Problem 8.20P

Question 3: Superheated steam enters a turbine at 7 MPa, 550°C, and exits at 150kPa a. Draw the system. b. If the process is reversible adiabatic (isentropic), find the final temperature (T2), the final enthalpy (h2,) of the steam, and do the energy balance to calculate the turbine work (Wts). c. Using entropy balance, show that Sgen for the above process is 0. d. If the isentropic efficiency is 85%, find the actual final temperature (T23) and calculate Sgen? e. Plot process in (b) and (d) on a Ts diagram with proper labelling.

9. An air compressor takes in air at 105 Pa and 27°C having volume of 1.5 m3/kg and compresses it to 4.5×105 Pa. Find the work done, heat transfer and change in internal energy if the compression is isothermal.

The 1 lb of air has decrease of internal energy of 20.58 Btu while its Fahrenheit temperature is reduced to 1/3 of the initial temperature during a reversible nonflow constant pressure process. Find 1).the initial and final temperatures, 2). heat 3).work

Steam expands isentropically from 2 MPa and 375 o C to a final temperature of 95 o C.Find the final quality and the work for a non-flow and steady flow processes.

Please be very detailed

A steam with a quality of 49%, enters an adiabatic nozzle at 3.5 MPa and leaves at 0.4 MPa and 140 oC with a flow of 7 m/s. Find the entrance velocity, in m/s.

Number 4

6. Steam expands isentropically from 2 MPa and 375 °C to a final temperature of 95 °C. Find the final quality and the work for a non-flow and steady flow processes.

An adiabatic turbine has an efficiency of 90%. If air is compressed from 1100kpa and 227 degree Celsius to 101kpa. Find the work done and final temperature. Sketch process on T-S diagram.