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, the pressure is maintained at
constant value. Determine (
a
) the mass of R134a that has entered and (
b
) the amount of heat
transfer.
Homework Answers
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0.4 kg of Refrigerant 134a initially fills a piston–cylinder
device with a volume of 15 L...
4. A 1.5-m rigid tank is initially empty. Refrigerant (R-134a) in the supply line at 750kPa...
4. A 1.5-m rigid tank is initially empty. Refrigerant (R-134a) in the supply line at 750kPa and 20°C is connected to the well-insulated tank through a valve. The valve is opened, and R-134a enters the tank until the pressure in the tank reaches the pressure of 500 kPa, at which point the valve is closed. (a) Write the assumptions. (b) Show the 1" law of thermodynamics with a control volume. (c) Determine the final temperature in the tank. (d) Determine...
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.
1-A piston-cylinder device with a set of stops contains 10 kg of refrigerant-134a. Initially, 8 kg...
1-A piston-cylinder device with a set of stops contains 10 kg of refrigerant-134a. Initially, 8 kg of the refrigerant is in the liquid form, and the temperature is 8°C. Now heat is transferred slowly to the refrigerant until the piston hits the stops, at which point the volume is 400 L. Determine (a) The temperature when the piston first hits the stops and (b) The work done during this expansion process. Also, show the process on a P-V diagram.
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).
QUESTION 3 A 0.25m of saturated liquid refrigerant-134a at 80°C is contained in frictionless insulated piston-cylinder...
QUESTION 3 A 0.25m of saturated liquid refrigerant-134a at 80°C is contained in frictionless insulated piston-cylinder device as shown in Figure Q2(b). A paddle-wheel is placed inside the cylinder chamber to stir the refrigerant-134a and the paddle wheel transfer a total work of 245 kJ to the fluid. Moreover, a 440 V and 9 amp of resistor is also placed inside the cylinder chamber to heat the refrigerant-134a. With the aid of a P-V diagram, determine the time taken for...
A piston cylinder device with a free floating piston contains 0.3 kg of R-134a at 400...
A piston cylinder device with a free floating piston contains 0.3 kg of R-134a at 400 kPa and 0 C. The volume of the cylinder is what?
Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then...
Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then as a result of heat added the quality increases to 45%, what is the change in volume per one unit of mass (m3/kg)? The piston is assumed to move freely but it is sealed tight that does not allow mass exchange. Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then as a result of heat added the...
50 kg of R-134a at s80 kPa is contained in a piston-cylinder device where V =...
50 kg of R-134a at s80 kPa is contained in a piston-cylinder device where V = 0.4 m^3. The system is cooled at constant pressure until the internal energy is half the initial. Determine: 1) Final Temperature (Tfinal) 2) Final Quality (Xfinal) 3) Final Volume (Vfinal)
fast please 20 min 0.05 m3 of saturated vapor refrigerant-134a is contained in an insulated piston-...
fast please 20 min
0.05 m3 of saturated vapor refrigerant-134a is contained in an insulated piston- cylinder device at 2500 kPa pressure. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 400 kPa. Determine: (a) the final temperature in the cylinder, and (b) the work done by the refrigerant. . Paragraph BIE
A vertical piston- cylinder device contains 0.85 kg of R134a at -10°C. The piston has free...
A vertical piston- cylinder device contains 0.85 kg of R134a at -10°C. The piston has free movement and its mass is 12 kg, with a diameter of 25 cm. The local atmospheric pressure is 87.6018 kPa. Heat is transferred to R-134a until its temperature is 15°C. Determine: a) The developed work, in kJ b) Heat transfer, in kJ
4. A 1.5-m rigid tank is initially empty. Refrigerant (R-134a) in the supply line at 750kPa and 20°C is connected to the well-insulated tank through a valve. The valve is opened, and R-134a enters the tank until the pressure in the tank reaches the pressure of 500 kPa, at which point the valve is closed. (a) Write the assumptions. (b) Show the 1" law of thermodynamics with a control volume. (c) Determine the final temperature in the tank. (d) Determine...
1-A piston-cylinder device with a set of stops contains 10 kg of refrigerant-134a. Initially, 8 kg of the refrigerant is in the liquid form, and the temperature is 8°C. Now heat is transferred slowly to the refrigerant until the piston hits the stops, at which point the volume is 400 L. Determine (a) The temperature when the piston first hits the stops and (b) The work done during this expansion process. Also, show the process on a P-V diagram.
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).
QUESTION 3 A 0.25m of saturated liquid refrigerant-134a at 80°C is contained in frictionless insulated piston-cylinder device as shown in Figure Q2(b). A paddle-wheel is placed inside the cylinder chamber to stir the refrigerant-134a and the paddle wheel transfer a total work of 245 kJ to the fluid. Moreover, a 440 V and 9 amp of resistor is also placed inside the cylinder chamber to heat the refrigerant-134a. With the aid of a P-V diagram, determine the time taken for...
Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then as a result of heat added the quality increases to 45%, what is the change in volume per one unit of mass (m3/kg)? The piston is assumed to move freely but it is sealed tight that does not allow mass exchange. Refrigerant 134a in a cylinder-piston assembly is at 240 kPa with a quality 15% and then as a result of heat added the...
fast please 20 min
0.05 m3 of saturated vapor refrigerant-134a is contained in an insulated piston- cylinder device at 2500 kPa pressure. The refrigerant is now allowed to expand in a reversible manner until the pressure drops to 400 kPa. Determine: (a) the final temperature in the cylinder, and (b) the work done by the refrigerant. . Paragraph BIE
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