ice, take us 3.26 Consider a piston-cylinder assembly that initially contains 0.5 kg of steam at...
Arigid tank of volume 0.5 m3 is connected to a piston-cylinder assembly by a valve as shown in the diagram below. Both vessels contain pure water. They are immersed in a constant- temperature bath at 200°C and 600 kPa. Consider the tank and the piston-cylinder as- sembly as the system and the constant-temperature bath as the surroundings. Initially the valve is closed, and both units are in equilibrium with the surroundings (the bath). The rigid tank contains saturated water with...
Question 11 A piston cylinder-device contains 12 kg of steam at 100 kPa and 175°C. Over time, the steam in the piston-cylinder device isobarically loses heat to its surroundings until it reaches a temperature of 99.61"C and all the vapor in the piston has condensed into liquid. a. Determine the entropy change of the steam, in kJ/K b. For the steam and its surroundings, determine the total entropy change associated with this process, in kJ/K. The temperature of the surroundings...
100 kg of steam is enclosed in a piston-cylinder device, initially at 573.15 K and 0.5 MPa. It expands and cools to 473.15 K and 0.1 MPa. A. What is the change in internal energy of the steam in this process? B. If the external pressure is constant at 0.1 MPa, how much work was done by the steam on the surroundings?
1.Water vapor contained in a piston–cylinder assembly undergoes an isothermal expansion at 277°C from a pressure of 5.1 bar to a pressure of 2.7 bar. Evaluate the work, in kJ/kg. 2.Nitrogen (N2) contained in a piston–cylinder arrangement, initially at 9.3 bar and 437 K, undergoes an expansion to a final temperature of 300 K, during which the pressure–volume relationship is pV1.1 = constant. Assuming the ideal gas model for the N2, determine the heat transfer in kJ/kg. 3.Argon contained in...
Steam undergoes an isentropic compression in an insulated piston–cylinder assembly from an initial state where T1 = 120°C, p1 = 1 bar to a final state where the pressure p2 = 20 bar. Determine the final temperature, in °C, and the work, in kJ per kg of steam.
consider a piston-cylinder assembly that operate in isobaric process. steam undergoes the process from 400C to reach 900C. Select two different values of pressure in the range of 5 to 20 MPa at which the preocess is undergoing and subsequently plot the heat transfer (kJ/kg) as a function of the chosen pressure values. Consider a piston-cylinder assembly that operates in isobaric process. Steam undergoes the process from 400 °C to reach 900 °C. Select two different values of pressure in...
100 kg of steam is enclosed in a piston-cylinder device initially at 300°C and 5 bar It expands and cools to 200°C and 1 bar. What is the change in entropy?
A piston –cylinder device initially contains 0.2 kg of steam at 1400 kPa and 350C. The steam is then cooled at constant pressure until it is at 200C. (a) Determine the volume change of the cylinder during this process using the compressibility factor. (b) Compare the result in part (a) to that obtained using actual property values.
5. (a)Consider adiabatic compression of 2 kg of air in a piston-cylinder assembly from 1 bar and 330 K (State 1) to 14 bar and 700 K (State 2). Air can be considered an ideal gas at these conditions and molecular weight of air is 28.97 kg/kmol. Find the entropy of air in State 1 and State 2. Using the entropy balance equation for a closed system calculate the entropy generation (kJ/K) during the compression process. (b) If entropy decreases...
Problem 5- A piston-cylinder device initially contains steam at 3.5 MPa, superheated by .10°C. Now, steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at .200C. Determine the initial temperature of the steam a. b. Sketch the process on a P-v an T-v diagram Determine the initial specific enthalpy, in kJ/kg d. Determine the enthalpy change...