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 3.81P
To determine
Mass of nitrogen and heat transfer for the process.
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Carbon dioxide (CO₂) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 50 lb/in², and a volume of 1.6 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.
Carbon dioxide (CO₂) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 50 lb/in², and a volume of 1.6 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.
Step 1
Determine the mass of the carbon dioxide, in lb.
m = 0.60792
Hint
Your answer is correct.
Step 2
* Your answer is incorrect.
Determine the work, in Btu.
W12= -53.4318
eTextbook and Media
Hint
lb
Btu
Attempts: 1 of 4 used
Assistance Used
Oxygen (O2) is contained within a horizontal piston-cylinder system initially at 500 kPa, 200°C, and occupies a volume of 0.04 m3 . The gas expands according to the process described by pV1.15 = Constant, until the temperature reaches 97°C. Considering oxygen as an ideal gas and taking the specific heat of oxygen as constant at an average temperature between two states,
a) Determine the final pressure (in kPa) and volume (m3).
b) Determine the amount of work and heat transfer during the process, in kJ.
c) Find the entropy production in this process (in kJ/K) if the boundary temperature is taken as 350°C.
d) Write down the main sources of irreversibilities.
e) Draw the processes on P-v and T-s diagrams.
Chapter 3 Solutions
Fundamentals Of Engineering Thermodynamics
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- Steam, initially at 700 lbf/in.², 550°F undergoes a polytropic process in a piston-cylinder assembly to a final pressure of 2900 lbf/in.² Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.4, (a) using data from the steam tables. (b) assuming ideal gas behavior. Part A Your Answer Determine the heat transfer, in Btu per lb of steam, using data from the steam tables. Q/m = 46.46 Part B Correct Answer (Used) * Your answer is incorrect. Determine the heat transfer, in Btu per lb of steam, assuming ideal gas behavior. Btu/b Q/m-i156.8 e Textbook and Media Hint Save for Later Btu/lb Attempts: 1 of 4 used Submit Answerarrow_forwardSteam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston-cylinder assembly to a final pressure of 2900 lbf/in.² Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.4, (a) using data from the steam tables. (b) assuming ideal gas behavior.arrow_forwardProblem 3.091 SI Carbon dioxide (CO2) is compressed in a piston–cylinder assembly from p1 = 0.7 bar, T1 = 280 K to p2 = 8 bar. The initial volume is 0.2 m3. The process is described by pV1.25 = constant.Assuming ideal gas behavior and neglecting kinetic and potential energy effects, determine the work and heat transfer for the process, each in kJ, using constant specific heats evaluated at 300 K, and data from Table A-23.arrow_forward
- One-quarter Ibmol of oxygen gas (O₂) undergoes a process from p₁ = 20 lbf/in², T₁ = 500°R to p2 = 150 lbf/in². For the process W = -500 Btu and Q = -177.5 Btu. Assume the oxygen behaves as an ideal gas. Determine T2, in °R, and the change in entropy, in Btu/°R.arrow_forwardSteam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 2900 lbf/in.2 Kinetic and potential energy effects are negligible.Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.6,(a) using data from the steam tables.(b) assuming ideal gas behavior.arrow_forwardSteam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston-cylinder assembly to a final pressure of 2200 lbf/in.² Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.6, (a) using data from the steam tables. (b) assuming ideal gas behavior. Part A Determine the heat transfer, in Btu per lb of steam, using data from the steam tables. Q/m = i Save for Later Btu/lb Attempts: 0 of 4 used Submit Answerarrow_forward
- Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston-cylinder assembly to a final pressure of 2200 lbf/in.² Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.6, (a) using data from the steam tables. (b) assuming ideal gas behavior. * Your answer is incorrect. Determine the heat transfer, in Btu per lb of steam, using data from the steam tables. Q/m = i 84.42 Btu/lbarrow_forwardQUESTION II: 0.5 m' of air at T1 = 67 °C, P1 = 700 kPa undergoes a polytropic expansion to a final pressure of 350 kPa. The process follows pV3 = constant and the work done by the air is 175 kJ. Assuming ideal gas behavior for the air, and neglecting kinetic and potential energy effects, determine: (a) the final temperature, in °C. (b) the heat transfer, in kJ. Airarrow_forwardQUESTION II: 0.5 m' of air at Ti = 67 °C, Pi = 700 kPa undergoes a polytropic expansion to a final pressure of 350 kPa. The process follows pV3= constant and the work done by the air is 175 kJ. Assuming ideal gas behavior for the air, and neglecting kinetic and potential energy effects, determine: (a) the final temperature, in °C. (b) the heat transfer, in kJ. Airarrow_forward
- A certain ideal gas has the following properties: Molecular Mass, M = 24.943416 kg/kmole and Cvo = 1.000 kJ/ºK/kg. Determine Cpo in kJ / °K / kg.arrow_forward9 kmol of oxygen (O₂) gas undergoes a process in a closed system from p₁ = 50 bar, T₁ = 170 K to P₂ = 25 bar, T₂ = 200 K. Determine the change in volume, in m³. x m³ AV = 3.442arrow_forwardA mass of 3 kilograms of air in a piston-cylinder assembly undergoes two processes in series from an initial state where p1 = 1.5 MPa, T1 = 264°C: Process 1–2: Constant-temperature expansion until the volume is twice the initial volume. Process 2–3: Constant-volume heating until the pressure is again 1.5 MPa.Assuming ideal gas behavior, determine the temperature at state 3, in kelvin.arrow_forward
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