Question

H3.3 A frictionless piston-cylinder device contains 2 kg of H2O initially at T1 = 300◦C and...

H3.3 A frictionless piston-cylinder device contains 2 kg of H2O initially at T1 = 300◦C and p1 = 5 bar. The device is cooled at constant pressure until the volume is ∀2 = 0.5 m3 . Assume a quasiequillibrium process which occurs slowly with no acceleration as the piston moves. Kinetic and potential energy effects are negligible. Determine: a. work [kJ] during process (indicate magnitude and direction) b. heat transfer [kJ] during process (indicate magnitude and direction)

Engineering   Mechanical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #2

answered by: anonymous
0 0
Know the answer?
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
Similar Questions
1-kg water in a frictionless piston-cylinder device is initially at 250°C and 300 kPa (state 1)....
1-kg water in a frictionless piston-cylinder device is initially at 250°C and 300 kPa (state 1). A total of 700 kJ of work is done ON the water in order to isothermally reduce its volume to 1/20 of its initial volume (state 2). Determine the magnitude and direction of the heat transfer involved in this process. Answer: -1147 kJ.
Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 =...
Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 = 280 K to p2 = 14 bar. The initial volume is 0.2 m3. The process is described by pV1.25 = constant. Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer for the process, each in kJ, using constant specific heats evaluated at 300 K, and data from Table A-23.
A piston-cylinder device with a set of stops initially contains 0.35 kg of steam at 1.0...
A piston-cylinder device with a set of stops initially contains 0.35 kg of steam at 1.0 MPa and 900 degrees C. The location of the stops corresponds to 44 percent of the initial volume. Now the steam is cooled. Determine the magnitude of the compression work if the final state is (A) 1.0 MPa and 600 degrees C and W=. kJ (B) 500 kPa. W=. kJ (C) Also determine the temperature at the final state in part (B). T2=. C
A piston-cylinder device initially contains 75 g of saturated water vapor at 340 kPa . A...
A piston-cylinder device initially contains 75 g of saturated water vapor at 340 kPa . A resistance heater is operated within the cylinder with a current of 0.6 A from a 300 V source until the volume doubles. At the same time a heat loss of 7 kJ occurs. Part A)Determine the final temperature (T2). Part B)Determine the duration of the process. Part C) What-if scenario: What is the final temperature if the piston-cylinder device initially contains saturated liquid water?
A piston cylinder device contains 0.15 kg of air initially at 2 MPa and 350 C....
A piston cylinder device contains 0.15 kg of air initially at 2 MPa and 350 C. First, the air expands isothermally to a pressure of 500 kPa. Then, it is compressed polytropically back to the initial pressure (2 MPa) with a polytropic exponent of 1.2. Find the work performed or introduced by or to the air for each process. Express it both times in kJ.
An insulated cylinder is initially divided into halves by a frictionless, thermally conducting piston. On one...
An insulated cylinder is initially divided into halves by a frictionless, thermally conducting piston. On one side of the piston is 1 m3 of a gas at 300 K, 2 bar. On the other side is 1 m3 of the same gas at 300 K, 1 bar.The piston is released and equilibrium is attained, with the piston experiencing no change of state. Employing the ideal gas model for the gas, determine (b) the final pressure, in bar. (c) the amount...
A 0.2 m3 piston-cylinder initially contains 400 K air. A heavy frictionless piston maintains a pressure...
A 0.2 m3 piston-cylinder initially contains 400 K air. A heavy frictionless piston maintains a pressure of 500 kPa abs. Then, a weakness in the cylinder wall blows out and creates a hole. Air escapes through the hole until the piston drops far enough to cover the hole. At that point, the volume is half the initial volume. During this process, 75 kJ of heat is transferred to the 100 kPa, 300 K surroundings. Using Cp = 1.005 kJ/kg-K and...
A mass of one kg of water within a piston–cylinder assembly undergoes a constant-pressure process from...
A mass of one kg of water within a piston–cylinder assembly undergoes a constant-pressure process from saturated vapor at 500 kPa to a temperature of 260°C. Kinetic and potential energy effects are negligible. For the water: a) Evaluate the work, in kJ, b) If the work is 30 kJ, evaluate the heat transfer, in kJ, c) If the heat transfer is negligible, evaluate the entropy production in kJ/K d) Determine if the process is reversible, irreversible, or impossible.
Water, initially (state 1) a saturated liquid at 1100C, is contained in a piston-cylinder assembly. The...
Water, initially (state 1) a saturated liquid at 1100C, is contained in a piston-cylinder assembly. The water undergoes a process to the corresponding saturated vapor (state 2), during which the piston moves freely in the cylinder. If the change of state is brought about by heating the water as it undergoes an internally reversible process at constant pressure and temperature, determine (a) heat transfer using first law of thermodynamics in kJ/kg and (b) heat transfer using second law of thermodynamics...
A piston-cylinder device contains 0.54 kg of steam at 300 degrees C and 3 MPa. Steam...
A piston-cylinder device contains 0.54 kg of steam at 300 degrees C and 3 MPa. Steam is cooled at constant pressure until one-half of the mass condenses. (A) Find the final temperature (B) Determine the volume change
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT