HomeworkLib
Question
thermodynamics

P5.31: - Steam at 3 MPa and 400°C enters an adiabatic nozle steadily with a velocity of 40 m/s and leaves at 2.5 MPa and 300 m/s. Determine (a) the exit temperature (b) the ratio of the inlet to exit area A1/A2.
Thermodynamics
P5.64:- Refrigerant-134a at 800 kPa and 25°C is throttled to a temperature of 220°C. Determine the pressure and the internal energy of the refrigerant at the final state P1-0.8 MPa
science   Advanced-Physics   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

5-31 inlet-to-exit area of the nozzle are to be determined Assumptions 1 This is a steady-flow process since there is no change with time. 2 Potential energy changes are negligible. 3 There are no work interactions. 4 The device is adiabatic and thus heat transfer is negligible Properties From the steam tables (Table A-6). Steam is accelerated in a nozzle from a velocity of 40 m/s to 300 m/s. The exit temperature and the ratio of the Д = 3 MPa I v1 = 0.09938 m 3 /kg 11=400°C] h,-3231.7 kJ/kg Analysis (a) There is only one inlet and one exit, and thus 깨 = 7 =771 . We take nozzle as the system. which is a control volume since mass crosses the boundary. The energy balance for this steady-flow system can be expressed in the rate form as 70 (steady) Éin - Éout =0 system Rate of net energy transfer byheat, work, andmass Rate of changein intemal,kinetic, potential etc. energies P1 = 3 MPa Ti 400°C = 40 m/s Steam P2 2.5 MPa -->- у, 300 m/s out or V3231.7kJ/kg (300 m/s)2 -(40 m/s) 1 kJkg 3187.5 kJ/kg 1000 m2/s2 us T2 376.6C P - 2.5 MPa h 3187.5 kJ/kg 0.11533 m /kg (b) The ratio of the inlet to exit area is determined from the conservation of mass relation, A 242 (0.09938 m/kg) (300 m/s) (0.11533 m3/kg)(40 m/s) -6.46 V2

I hope you understood the problem and got your answers, If yes rate me!! or else comment for a better solutions

0 0
Add a comment
Know the answer?
Add Answer to:
thermodynamics Thermodynamics P5.31: - Steam at 3 MPa and 400°C enters an adiabatic nozle steadily with...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • 5-30 Air enters an adiabatic nozzle steadily at 300 kPa, 200°C, and 30 m/s and leaves...

    5-30 Air enters an adiabatic nozzle steadily at 300 kPa, 200°C, and 30 m/s and leaves at 100 kPa and 180 m/s. The inlet area of the nozzle is 80 cm². Determine (a) the mass flow rate through the nozzle, (b) the exit temperature of the air, and (c) the exit area of the nozzle. Answers: (a) 0.5304 kg/s, (b) 184.6°C, (c) 38.7 cm P = 300 kPa T, = 200°C Vi = 30 m/s A = 80 cm AIR...

  • Steam enters an adiabatic turbine steadily at 7 MPa, 500 °C, and 45 m/s

    Steam enters an adiabatic turbine steadily at 7 MPa, 500 °C, and 45 m/s, and leaves at 100 kPa and 75 m/s. If the power output of the turbine is 5 MW and the isentropic efficiency is 77 percent, determine: A. the mass flow rate of steam through the turbine, B. the temperature at the turbine exit, and C. the rate of entropy generation during this process.

  • Carbon dioxide enters an adiabatic nozzle steadily at 1 MPa and 500°C with a mass flow...

    Carbon dioxide enters an adiabatic nozzle steadily at 1 MPa and 500°C with a mass flow rate of 6000 kg/h and leaves at 100 kPa and 450 m/s. The inlet area of the nozzle is 40 cm2 Determine (a) the inlet velocity and (b) the exit temperature.

  • Nitrogen gas at 60 kPa and 7°C enters an adiabatic diffuser steadily with a velocity of...

    Nitrogen gas at 60 kPa and 7°C enters an adiabatic diffuser steadily with a velocity of 200 m/s and leaves at 85 kPa and 22°C. Determine (a) the exit velocity of the nitrogen and (b) the ratio of the inlet to exit area A1/A2. Why in this question we ignore the value of mass flow rate ?

  • Steam enters an adiabatic turbine steadily at 3 MPa and 450°C at a rate of 8...

    Steam enters an adiabatic turbine steadily at 3 MPa and 450°C at a rate of 8 kg/s and exits at 0.2 MPa and 150*C. If the surrounding air is at 25°C and 100 kPa, determine: a. The specific flow exergy of steam at turbine entrance b. The specific flow exergy of steam at turbine exit c. The rate of flow exergy change in the process.

  • Steam enters an adiabatic nozzle at 400 °C and 800 kPa with a velocity of 16...

    Steam enters an adiabatic nozzle at 400 °C and 800 kPa with a velocity of 16 m/s. It leaves the nozzle at 300 °C and 400 kPa. The inlet area of the nozzle is 800 cm2. Determine; a. The mass flow rate through the nozzle, in kg/s Ans. _kg/s b. The volume flow rate of the steam at the exit, in m3/s Ans._ _m3/s The velocity of the steam at the nozzle exit, in c. m/s Ans. m/s

  • Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 6 MPa,...

    Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 6 MPa, 400°C, and 80 m/s, and the exit conditions are 40 kPa, 92 percent quality, and 50 m/s. The mass flow rate of the steam is 20 kg/s. Determine (a ) the change in kinetic energy, (b) the power output, and (c) the turbine inlet area.

  • Steam with the mass flow rate of 0.75 kg/s enters an adiabatic turbine steadily at 19 MPa, 600°C and 150 m/s

    Steam with the mass flow rate of 0.75 kg/s enters an adiabatic turbine steadily at 19 MPa, 600°C and 150 m/s, and leaves at 150 kPa and 350 m/s. The isentropic efficiency of the turbine is 85%. Neglect potential energy. (I) Determine the exit temperature of the steam, and its quality (if saturated mixture)  (ii) Calculate the actual power output of the turbine, in kW (iii)  Illustrate a T-s diagram with respect to saturation lines for the isentropic process by clearly indicating all pressure, temperature,...

  • 1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C...

    1. Water enters the constant 130-mm inside-diameter tubes of a boiler at 7 MPa and 65°C and leaves the tubes at 6 MPa and 450°C with a velocity of 80 m/s. Calculate the velocity of the water at the tube inlet and the inlet volume flow rate. [5-14] 2. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5...

  • 4-1-30 [WX] An adiabatic steam nozzle operates steadily under the following conditions. Inlet: superheated vapor, p1...

    4-1-30 [WX] An adiabatic steam nozzle operates steadily under the following conditions. Inlet: superheated vapor, p1 = 1 MPa, T1 = 300°C, A1 78.54 cm2; Exit: saturated vapor, p2 = 100 kPa. Determine (a) the exit velocity (V2) in m/s, (b) the rate of entropy Solution] [Discuss] generation (Šgen) in kW/K. The mass flow rate (m is 1 kg/s.

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT