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 4, Problem 4.81P
a)
To determine
Initial and final mass of air in cavern.
b)
To determine
Work done by the compressor.
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A cycle starts with an adiabatic compression of the air from state a with a volume V3 to state b with volume V1. At the end of the compression, heat is added (absorbed), resulting in an isobaric expansion to state c with volume V2 followed by an adiabatic expansion back to volume V3 at state d. Finally, heat is expelled, corresponding to an isochoric reduction completing the cycle and bringing air back to state a.
Find the ratio between the initial and final temperatures for (1) the adiabatic compression, and (2) the adiabatic expansion in terms of the expansion ratio re = V3 /V2 and the compression ratio rc = V3 /V1..
Question #2
For the following processes, find the changes in h as appropriate.
The initial state pressure is p1 = 0.5 MPa. the final state is 2.
a. constant volume : v1 = 0.3 m3/kg, p2 = 0.3 MPa;
b. constant entropy : s1 = 6.3 kJ/kg K, p2 = 0.15 MPa;
c. constant volume : h1 = 2500 kJ/kg, p2 = 0.2 MPa;
d. constant enthalpy : s1 = 6.4 kJ/kg K, p2 = 0.2 MPa;
4.13
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
Ch. 4 - Prob. 4.1ECh. 4 - Prob. 4.2ECh. 4 - Prob. 4.3ECh. 4 - Prob. 4.4ECh. 4 - Prob. 4.5ECh. 4 - Prob. 4.6ECh. 4 - Prob. 4.7ECh. 4 - Prob. 4.8ECh. 4 - Prob. 4.9ECh. 4 - Prob. 4.10E
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- Problem 22.3 Air is contained inside a simple piston cylinder device as shown in the figure. It expands from state 1 to state 2 according the process information shown below: State 1: P₁= 200 kPa; ₁ = 0.5 m³; T₁ = 300 K Process 1-2: Expansion process (see graph) where P = 50 kPa + (300 kPa/m³) State 2: P₂ = 350 kPa; ₂ = 1.0 m³ Determine: the work done on or by the air contained in the piston-cylinder device, in kJ (indicate direction, i.e., is the work done on or by the air?) Air P 350 kPa 200 kPa 1 0.5 1.0 Ans: d) 185 kJ <≤ Wnet] ≤ 200 kJ Karrow_forwardCHR 6. An inventor comes to you with a device that produces work. She tells you helium gas at 10 atm and 650 K enters the device and exits at 2 atm and 260 K. Assume an ideal gas with constant specific heat and the surroundings are at 25 C, Cp = 5.2 kJ/kg-K. Is this process possible assuming steady-state operation?arrow_forwardIdentify the Enthalpy of State 1 to 4 (h1, h2, h3 and h4)arrow_forward
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- Hi, I need to go over this problem, but how do you find To and Po. Can you walk me through every question that I state on the paper? Thanksarrow_forwardA cycle starts with an adiabatic compression of the air from state a with a volume V3 to state b with volume V1. At the end of the compression, heat is added (absorbed), resulting in an isobaric expansion to state c with volume V2 followed by an adiabatic expansion back to volume V3 at state d. Finally, heat is expelled, corresponding to an isochoric reduction completing the cycle and bringing air back to state a. The thermodynamic identity is given by dU = T dS − P dV. The constant values for the entropy during the adiabatic compression and expansion are S1 and S2, respectively. Illustrate the cycle on a T S diagram labelling states a, b, c and d then find an expression for the temperature T as a function of entropy S for the isobaric and isochoric strokes of the cycle (engine).arrow_forwardpls answer correctly the givenarrow_forward
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