A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 100 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 200 kPa. Heat transfer continues until the total volume increases by 30 perce-t Determine a) the initial and final temperatures, b) the mass of liquid water when the piston first starts moving, and c) the work done during this process.

A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 100 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 200 kPa. Heat transfer continues until the total volume increases by 30 perce-t Determine a) the initial and final temperatures, b) the mass of liquid water when the piston first starts moving, and c) the work done during this process.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston- cylinder device at 100 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 200 kPa. Heat transfer continues until the total volume increases by 30 perce-t Determine a) the initial and final temperatures, b) the mass of liquid water when the piston first starts moving, and
1. A frictionless piston-cylinder device with cross-section area of 0.01 m² contains 0.5 m3 gaseous ammonia initially at 200 kPa and 135 °C. Now the gas is isothermally compressed until the pressure increases to 800 psig. The surrounding pressure is 100 kPa and the gravitational force is 9.8 m/s? a. What is the mass of the gas in kg b. What is the mass of the piston in kg c. Calculate the volume in m³ of the compressed gas
(b) A frictionless piston-cylinder device as shown in Fig. Qlb contains water at 400 kPa and the water is heated at constant pressure from saturated liquid to saturated vapor. Then, the heating process is continued in an isobaric manner until its specific volume reaches the value of 0.5 m²/kg. Water Heat Figure Q1b i) What is the initial temperature of water in the cylinder? ii) What is the final temperature of water in the cylinder? iii) Calculate the total boundary work during the processes, kJ/kg. iv) Calculate the total amount of heat transferred during the processes, kJ/kg. v) Sketch both processes on a T – v diagram with respect to saturation lines.
(b) A frictionless piston-cylinder device as shown in Fig. Qlb contains water at 300 kPa and the water is heated at constant pressure from saturated liquid to saturated vapor. Then, the heating process is continued in an isobaric manner until its specific volume reaches the value of 0.7 m'/kg. Water Heat Figure Qlb i) What is the initial temperature of water in the cylinder? ii) What is the final temperature of water in the cylinder? iii) Calculate the total boundary work during the processes, kJ/kg. iv) Calculate the total amount of heat transferred during the processes, kJ/kg. v) Sketch both processes on a T – v diagram with respect to saturation lines.
1) A piston-cylinder assembly contains 10 kg of refrigerant 134a. Initially, 8 kg of SA134a is in the liquid phase and the temperature is -10°C. Then there is a slow heat transfer to SA-134a, the piston rises and the piston touches the stoppers when the volume is 400 liters. (a) Show the phase change in the P-V diagram, (b) the temperature of the system at the moment the piston contacts the stoppers, (c) calculate the work done during the process.
2. Saturated liquid water at 250 kPa is contained in a piston-cylinder device as shown in the figure below. The total initial volume is 0.012m'. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. When the piston hits the stops the specific volume is 0.47443 m/kg. Heat transfer to the water continues until the pressure doubles. NOTE: If needed use the closest value in tables 3 to avoid interpolation. Use 5 decimal digits when using specific volume. a.) Plot the process in a P-v-diagram with respect to saturations lines. b.) Fill de table below c.) Determine the total mass P(kPa) T(°C) v(m'/kg) h(kJ/kg) Phase 2 3.
A frictionless piston-cylinder device as shown in Fig. Qlb contains water at 400 kPa and the water is heated at constant pressure from saturated liquid to saturated vapor. Then, the heating process is continued in an isobaric manner until its specific volume reaches the value of 0.5 mkg. Water Heat Figure Qlb i) What is the initial temperature of water in the cylinder? ii) What is the final temperature of water in the cylinder? iii) Calculate the total boundary work đuring the processes, kJ/kg. iv) Calculate the total amount of heat transferred during the processes, kJ/kg. v) Sketch both processes on a T – v diagram with respect to saturation lines.
Ex: Argon in the amount of 1.5 kg fills a 0.04-m³ piston- cylinder device at 550 kPa. The piston is now moved by changing the weights until the volume is twice its original size. During this process, argon's temperature is maintained constant. Determine the final pressure in the device.
A friction-free, weighted piston-cylinder device contains 2.0 kg of water in a mixed state at a pressure of 150kPa and a quality of 0.60. As it sits there, heat is lost until the mixture becomes entirely a saturated liquid. How much heat is lost jn the process?
A piston-cylinder arrangement contains water at 110°C, 87% quality with a volume of 1 L. What is the initial mass, in grams? The system is then heated, causing the 150-mm- diameter piston to rise and encounter a linear spring with k = 800 kN/m. Calculate the specific internal energy (kJ/kg) at this instant knowing that the measured volume is 1.7 L. The heating continues and compresses the spring in the process. When the piston encounters the stops, the pressure is 200 kPa. What is the temperature (in °C) and entropy (in kJ/kg-K) at this point? Heating then continues until the pressure reaches 300 kPa. What is the volume, in L, at this instant? Illustrate the complete process in separate P-v and T-v diagrams. Hint: Draw the FBD of the piston in each state. wwwwwww D=0.15m H₂O
A 2.8 m^3 rigid tank is filled with saturated liquid vapor mixture of water at 300C. If 2% of its volume is liquid and the rest is vapor, the total mass in the tank in kg is?
Saturated water vapor at (T1,P1) is condensed to a saturated liquid at (T2,P2) in a spring-loaded piston-cylinder device, where (T1> T2), the expression for heat transfer for this process, in kJ/kg, will be Select one: A. Q = (u2 -u1)+0.5*(P2+P1)*(v2-v1) B. Q = (h2 -h1)+0.5*(P2+P1)*(v2-v1) C. Q = (h2 -h1)-0.5*(P2+P1)*(v2-v1) D. Q = h2 -h1 E. Q = (u2 -u1)-0.5*(P2+P1)*(v2-v1) F. Q = u2 -u1 G. Q = (h2 -h1)+(P2+P1)*(v2-v1) H. Q = (u2 -u1)+(P2+P1)*(v2-v1)