Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Chapter 3, Problem 3.40P
a.
To determine
Work per unit mass
b.
To determine
Mass of water
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A piston-cylinder assembly contains water, initially saturated liquid at 150^0C. The water is heated at constant temperature to saturated vapor.
If the rate of heat transfer to the water is 2.28 kW, determine the rate at which work is done by the water on the piston, in kW.
If in addition to the heat transfer rate given in part (a) the total mass of water is .1 kg, determine the time, in s, required to execute the process.
My approach is to use Q-W = U + KE + PE ?
Water initially a saturated liquid at 110°C is contained within a
piston-cylinder assembly. The water undergoes a process to
the corresponding saturated vapor state, during which the
piston moves freely in the cylinder. There is no heat transfer
with the surroundings. If the change of state is brought about
by the action of a paddle wheel, determine the net work per
unit mass, in kJ/kg.
Select one:
O a. -2225.63 kJ/kg
O b. -1981.12 kJ/kg
C. -2056.96 kJ/kg
O d. -1927.82 kJ/kg
A piston–cylinder assembly fitted with a slowly rotating paddle wheel contains 0.17 kg of air, initially at 300 K. The air undergoes a constant-pressure process to a final temperature of 400 K. During the process, energy is gradually transferred to the air by heat transfer in the amount 12 kJ.Assuming the ideal gas model with k = 1.4 and negligible changes in kinetic and potential energy for the air, determine the work done by the paddle wheel on the air and by the air to displace the piston, each in kJ.
Chapter 3 Solutions
Fundamentals Of Engineering Thermodynamics
Ch. 3 - Prob. 3.1ECh. 3 - Prob. 3.2ECh. 3 - Prob. 3.3ECh. 3 - Prob. 3.4ECh. 3 - Prob. 3.6ECh. 3 - Prob. 3.7ECh. 3 - Prob. 3.8ECh. 3 - Prob. 3.9ECh. 3 - Prob. 3.10ECh. 3 - Prob. 3.11E
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- A closed, rigid tank contains Refrigerant 134a, initially at 100°C. The refrigerant is cooled until it becomes saturated vapor at 20°C. For the refrigerant, determine the initial and final pressures, each in bar, and the heat transfer, in kJ/kg. Kinetic and potential energy effects can be ignored.arrow_forwardTwo kg of water is contained in a piston-cylinder assembly, initially at 10 bar and O °C. The water is slowly heated at constant pressure to a final state. If the heat ansfer for the process is 1740 kJ, determine the temperature at the final state, in °C, d the work, in kJ. Kinetic and potential energy effects are negligible. Hint: in this oblem, the transferred heat equals the enthalpy change.arrow_forwardCarbon dioxide (CO₂) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 30 lb-/in², and a volume of 1.8 ft³. The gas is stirred until its temperature is 500°F. During this process heat transfer from the gas to its surroundings occurs in an amount 2.6 Btu. Assume ideal gas behavior, but do not assume constant specific heats. Kinetic and potential energy effects can be ignored. Determine the mass of the carbon dioxide, in lb, and the work, in Btu.arrow_forward
- Water, initially saturated vapor at 3 bar, fills a closed, rigid container. The water is heated until its temperature is 360°C. For the water, determine the heat transfer, in kJ per kg of water. Kinetic and potential energy effects can be ignored. Q/m =_kJ/kgarrow_forwardAir is compressed in a piston-cylinder assembly from p₁ = 10 lb/in², T₁ = 500°R, V₁ = 9 ft³ to a final volume of V₂ = 1 ft³ in a process described by pv¹.30 = constant. Assume ideal gas behavior and neglect kinetic and potential energy effects. Using constant specific heats evaluated at T₁, determine the work and the heat transfer, in Btu. Step 1 Your answer is correct. Determine the work, in Btu. W12 = -52.4075 Hint Step 2 * Your answer is incorrect. Determine the heat transfer, in Btu. Q12-13.4475 Btu eTextbook and Media Btu Attempts: 1 of 4 usedarrow_forward2 kg of water vapor in a piston-cylinder assembly expands at a constant pressure of 300 kPa (3.0 Bar) from a saturated vapor state to a volume of 2.064 m³. a. Determine the initial temperature, in °C b. Determine the final temperature, in °C C. Determine the work for the process, in kJ. Water p= constant = 3.0 bar V22.064 m³ m = 2 kg State 1-2: Isochoric Processarrow_forward
- Current Attempt in Progress A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 600°F. The water undergoes two processes in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 40%. Neglect kinetic and potential energy effects. Determine the work and heat transfer for each process, all in Btu. Part A * Your answer is incorrect. Determine the work for the constant-pressure process, in Btu. W12-104240.736 Hint Btuarrow_forwardAir is compressed in a piston-cylinder assembly from p₁ = 25 lb/in², T₁ = 500°R, V₁ = 9 ft³ to a final volume of V₂ = 1 ft³ in a process described by pv¹.25 = constant. Assume ideal gas behavior and neglect kinetic and potential energy effects. Using constant specific heats evaluated at T₁, determine the work and the heat transfer, in Btu. Step 1 * Your answer is incorrect. Determine the work, in Btu. W12= i -658.845 Btuarrow_forwardA closed system consists of gas of 2 kg initially in state 1 with p1 = 4bar and specific volume 1m3 /kg. The system undergoes a power cycle consisting of the following V1 = processes: Process 1-2: polytropic process to v2 = 2m³/kg, P2 = 1bar; Process 2-3: isobaric compression to v1; Process 3-1: isochoric process to P1. Write the formula for the cycle work. Determine Wcycle and Qcycle-arrow_forward
- Water, initially saturated vapor at 4.5 bar, fills a closed, rigid container. The water is heated until its temperature is 400°C.For the water, determine the heat transfer, in kJ per kg of water.Kinetic and potential energy effects can be ignored.arrow_forwardDetermine the volume change, in ft°, when 1 Ib of water, initially saturated liquid, is heated to saturated vapor while pressure remains constant at 290 lbf/in.2 AV = i ft3arrow_forwardA closed, rigid tank is filled with water. Initially, the tank holds 1.0 lb of saturated vapor and 7.0 lb of saturated liquid, each at 212°F. The water is heated until the tank contains only saturated vapor. Kinetic and potential energy effects can be ignored. Determine the volume of the tank, in ft°, the temperature at the final state, in °F, and the heat transfer, in Btu.arrow_forward
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