Question

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.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is...
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is pv1.2 = constant. The mass of the gas is 0.4 lb and the following data are known: p1 = 160 lbf/in.2, V1 = 1 ft3, and p2 = 300 lbf/in.2 During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb. Δu⁢=
Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a...
Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 2200 lbf/in.2 Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.4, (a) using data from the steam tables. (b) assuming ideal gas behavior.
Entropy From Steam Tables A piston-cylinder assembly contain 2 kg of water. The water is initially...
Entropy From Steam Tables A piston-cylinder assembly contain 2 kg of water. The water is initially at the pressure of 0.5 MPa and the temperature of 300°C. The water is cooled down at constant pressure process until it is a saturated vapor. Determine the change in the entropy of the system.
Oxygen gas is contained in a piston cylinder assembly at an initial pressure of 1000 kPa...
Oxygen gas is contained in a piston cylinder assembly at an initial pressure of 1000 kPa and expands from 0.2 m3 to 1.0 m3 by a process where PV = constant. The gas has an internal energy change of -200 kJ. Calculate the work (kJ) and the heat transfer (kJ) done during the process.
1 kg of water in a piston cylinder arrangement is initially in a saturated liquid state...
1 kg of water in a piston cylinder arrangement is initially in a saturated liquid state at 1 bar. It undergoes expansion at constant pressure due to external heat supply to it, to a final state of saturated vapor. (i) What is the initial temperature of water in C? (a) 93.50 (b) 96.71 (c) 99.63 (d) 111.4 (e) 12.2 (ii) What is the change in enthalpy of water (kJ/kg-K)? (a) 417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1 (iii) What is...
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state...
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state of 800 kPa, 500 K. Initially air is at 110 kPa and 25oC. During the compression process heat transfer takes place with the ambient maintained at 25oC. Assume air as an ideal gas (R =0.287 kJ/kg) and has constant specific heats of Cp = 1.004 kJ/kgK and Cv = 0.717 kJ/kgK. If the mass of air in the cylinder is 0.1286 kg, determine a)...
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.
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)
Ammonia contained in a piston–cylinder assembly, initially saturated vapor at T1 = 4°F, undergoes an isothermal...
Ammonia contained in a piston–cylinder assembly, initially saturated vapor at T1 = 4°F, undergoes an isothermal process to a final specific volume v2 = 5.2 ft3/lb. Determine the final pressure, in lbf/in2, and the final quality, x2.
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT