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1-A piston-cylinder device with a set of stops contains 10 kg of refrigerant-134a. Initially, 8 kg...
Problem 5 A piston-cylinder device, shown below, with a set of stops contains 5 kg of...
Problem 5 A piston-cylinder device, shown below, with a set of stops contains 5 kg of Refrigerant-22. Initially 4 kg of the refrigerant is in the liquid state, and the temperature is -10 C. Now heat is transferred slowly to the refrigerant until it hits the stops, at which point the volume is 200 liters. Determine a) The temperature when the piston first hits the stops b) The work done during this process c) Show this process on a P-v...
0.4 kg of Refrigerant 134a initially fills a piston–cylinder device with a volume of 15 L...
0.4 kg of Refrigerant 134a initially fills a piston–cylinder device with a volume of 15 L at a pressure of 400 kPa. The cylinder is connected to a supply line through a valve. R-134a is flowing in the supply line at 900 kPa and 45°C. The valve is opened, and R-134a is allowed to enter the cylinder. The valve is closed when the volume of the cylinder is triple and the temperature in the cylinder reaches 15°C. During the process,...
A piston–cylinder device initially contains air at 150 kPa and 27 °C. In this state, the...
A piston–cylinder device initially contains air at 150 kPa and 27 °C. In this state, the piston is resting on a pair of stops, and the enclosed volume is 400 litres. The mass of the piston is such that a 200 kPa pressure is required to move it. The air is now heated until its volume has doubled. Sketch the process on a P-V diagram and determine (a) the mass of air and the final temperature, (b) the work done...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by 7.4 C. Now the stream 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 (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits...
Problem 5- A piston-cylinder device initially contains steam at 3.5 MPa, superheated by .10°C. Now, steam loses hea...
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...
A piston–cylinder device initially contains 0.6 m3 of saturated water vapor at 250 kPa. At this...
A piston–cylinder device initially contains 0.6 m3 of saturated water vapor at 250 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 300 kPa is required to move it. Heat is now slowly transferred to the steam until the volume becomes 1.5 m3. Use the data from the steam tables. a) Determine the final temperature. b) Determine the work done during this process. c)...
A piston-cylinder device with a set of stops initially contains 0.6 kg of steam at 1.0...
A piston-cylinder device with a set of stops initially contains 0.6 kg of steam at 1.0 MPa and 400 C. The location of the stops corresponds to 40 percent of the initial volume. Now the steam is cooled. Determine the compression work if the final state is (a) 1.0 MPa and 250 C and (b) 500 kPa. (c) Also determine the temperature at the final state in part (b).
Eight (8) kilogram of saturated vapor of refrigerant R-134a is contained in a closed frictionless piston-cylinder...
Eight (8) kilogram of saturated vapor of refrigerant R-134a is contained in a closed frictionless piston-cylinder device at a pressure of 200 kPa. Heat is then transferred to the refrigerant. At the end of the process, the refrigerant has a temperature of 70 °C. Determine the amount of heat that is transferred during the process. Also, show the process on a T-v diagram with respect to the saturated liquid and vapor lines. (35 points).
An adiabatic frictionless piston-cylinder device initially contains 4 kg of saturated R-134a liquid at 400 kPa. The refrigerant is then heated using a resistance wire that receives a current of 6 A from a DC power supply for 20 seconds and the volume is i
An adiabatic frictionless piston-cylinder device initially contains 4 kg of saturated R-134a liquid at 400 kPa. The refrigerant is then heated using a resistance wire that receives a current of 6 A from a DC power supply for 20 seconds and the volume is increased 100 times. Determine (a) the initial temperature, (b) the final temperature, (c) the change in the specific enthalpy, and (d) the voltage of the power source. Also show the process on the P-v diagram with...
An insulated piston-cylinder device contains 0.05 m3 of saturated R-134a vapor at 0.8 MPa. The refrigerant...
An insulated piston-cylinder device contains 0.05 m3 of saturated R-134a vapor at 0.8 MPa. The refrigerant is now allowed to expand in a reversible manner (i.e. isentropic) until the pressure drops to 0.4 MPa. Determine (a) the final temperature in the cylinder and (b) the work done by the refrigerant.
Problem 5 A piston-cylinder device, shown below, with a set of stops contains 5 kg of Refrigerant-22. Initially 4 kg of the refrigerant is in the liquid state, and the temperature is -10 C. Now heat is transferred slowly to the refrigerant until it hits the stops, at which point the volume is 200 liters. Determine a) The temperature when the piston first hits the stops b) The work done during this process c) Show this process on a P-v...
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by 7.4 C. Now the stream 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 (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits...
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...
Eight (8) kilogram of saturated vapor of refrigerant R-134a is contained in a closed frictionless piston-cylinder device at a pressure of 200 kPa. Heat is then transferred to the refrigerant. At the end of the process, the refrigerant has a temperature of 70 °C. Determine the amount of heat that is transferred during the process. Also, show the process on a T-v diagram with respect to the saturated liquid and vapor lines. (35 points).
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