Fundamentals of Engineering Thermodynamics
8th Edition
ISBN: 9781118832301
Author: SHAPIRO
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 1.9, Problem 32CU
To determine
Whether the statement is true or false “The value of the temperature expressed using the celsius temperature scale is always higher than its value expressed using the Kelvin scale”.
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As shown in the figure below, moist air at T₁ = 36°C, 1 bar, and 35% relative humidity enters a heat exchanger operating at steady state
with a volumetric flow rate of 10 m³/min and is cooled at constant pressure to 22°C. Ignoring kinetic and potential energy effects,
determine:
(a) the dew point temperature at the inlet, in °C.
(b) the mass flow rate of moist air at the exit, in kg/min.
(c) the relative humidity at the exit.
(d) the rate of heat transfer from the moist air stream, in kW.
(AV)1, T1
P₁ = 1 bar
11
= 35%
120
T₂=22°C
P2 = 1 bar
Air at T₁-24°C, p₁-1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3
kg/min and mixes with a saturated moist air stream entering at T₂-7°C, p2-1 bar. A single mixed stream exits at T3-17°C, p3-1 bar.
Neglect kinetic and potential energy effects
Step 1
Your answer is correct.
Determine mass flow rate of the moist air entering at state 2, in kg/min.
m2 = 2.1
Hint
kg/min
Using multiple attempts will impact your score.
5% score reduction after attempt 2
Step 2
Determine the relative humidity of the exiting stream.
Փ3 =
i
%
Attempts: 1 of 3 used
A reservoir at 300 ft elevation has a 6-in.-diameter discharge pipe located 50 ft below the surface. The pipe is 600 ft long and drops in elevation to 150 ft where the flow discharges to the atmosphere. The pipe is made of riveted steel with a roughness height of 0.005 ft.
Determine the flow rate without a head loss
Determine the flow rate with the pipe friction head loss.
(hints: Since the velocity is not known for part b and the Reynolds number and friction factor depend on velocity, you will need to iterate to find the solution. A good first guess is the velocity from part (a))
Chapter 1 Solutions
Fundamentals of Engineering Thermodynamics
Ch. 1.9 - Prob. 1ECh. 1.9 - Prob. 2ECh. 1.9 - 3. The driver’s compartment of race cars can reach...Ch. 1.9 - 4. What causes changes in atmospheric pressure?
Ch. 1.9 - 5. Why are passenger airplane cabins normally...Ch. 1.9 - 6. Laura takes an elevator from the tenth floor of...Ch. 1.9 - 7. How do dermatologists remove precancerous skin...Ch. 1.9 - 8. When one walks barefoot from a carpet onto a...Ch. 1.9 - 9. Why does ocean water temperature vary with...Ch. 1.9 - 10. Are the systolic and diastolic pressures...
Ch. 1.9 - 11. How do forehead temperature strips work?
Ch. 1.9 - 12. How does a pressure measurement of 14.7 psig...Ch. 1.9 - 13. What is a nanotubel
Ch. 1.9 - 14. If a system is at steady state, does this mean...Ch. 1.9 - For problems 1-10, match the appropriate...Ch. 1.9 - Prob. 11CUCh. 1.9 - 12. Describe the difference between specific...Ch. 1.9 - 13. A system is said to be at ___________ if none...Ch. 1.9 - 14. A control volume is a system that
(a) always...Ch. 1.9 - 15. What is the objective of an engineering model...Ch. 1.9 - 16. _______________ is pressure with respect to...Ch. 1.9 - 17. A gas contained within a piston–cylinder...Ch. 1.9 - 18. The statement, “When two objects are in...Ch. 1.9 - 19. SI base units include
(a) kilogram (kg), meter...Ch. 1.9 - 20. Explain why the value for gage pressure is...Ch. 1.9 - 21. A system is at steady state if
(a) none of its...Ch. 1.9 - Prob. 22CUCh. 1.9 - 23. Classify items a through g shown on the...Ch. 1.9 - 24. When a system is isolated,
(a) its mass...Ch. 1.9 - 25. The resultant pressure force acting on a body...Ch. 1.9 - 26. The list consisting only of intensive...Ch. 1.9 - 27. Gage pressure indicates the difference between...Ch. 1.9 - 28. Systems can be studied only from a macroscopic...Ch. 1.9 - 29. Kilogram, second, foot, and newton are all...Ch. 1.9 - Prob. 30CUCh. 1.9 - 31. Mass is an intensive property.
Ch. 1.9 - Prob. 32CUCh. 1.9 - 33. Intensive properties may be functions of both...Ch. 1.9 - 34. Devices that measure pressure include...Ch. 1.9 - Prob. 35CUCh. 1.9 - 36. If a system is isolated from its surroundings...Ch. 1.9 - 37. The specific volume is the reciprocal of the...Ch. 1.9 -
Indicate whether the following statements are...Ch. 1.9 - 39. The pound force, lbf, is equal to the pound...Ch. 1.9 - 40. The value of a temperature expressed using the...Ch. 1.9 - Prob. 41CUCh. 1.9 - 42. A closed system always contains the same...Ch. 1.9 - Prob. 43CUCh. 1.9 - 44. A control volume is a special type of closed...Ch. 1.9 - 45. When a closed system undergoes a process...Ch. 1.9 - Prob. 46CUCh. 1.9 - Prob. 47CUCh. 1.9 - 48. A vessel holding 0.5 kg of oxygen (O2)...Ch. 1.9 - Prob. 49CUCh. 1.9 - 50. In local surroundings at standard atmospheric...Ch. 1.9 - Prob. 51CUCh. 1.9 - 52. The Rankine degree is a smaller temperature...Ch. 1.9 - 53. If the value of any property of a system...Ch. 1.9 - Prob. 54CUCh. 1.9 - 55. The composition of a closed system cannot...Ch. 1.9 - 56. Temperature is the property that is the same...Ch. 1.9 - Prob. 57CUCh. 1.9 - 58. The pressure unit psia indicates an absolute...Ch. 1.9 - 1.4 Perform the following unit conversions:
(a) 1...Ch. 1.9 - 1.5 Perform the following unit conversions:
(a)...Ch. 1.9 - 1.6 Which of the following food items weighs...Ch. 1.9 - 1.7 A person whose mass is 150 lb weighs 144.4...Ch. 1.9 - 1.8 The Phoenix with a mass of 350 kg was a...Ch. 1.9 - Prob. 9PCh. 1.9 - 1.10 In severe head-on automobile accidents, a...Ch. 1.9 - Prob. 11PCh. 1.9 - 1.12 A spring compresses in length by 0.14 in, for...Ch. 1.9 - 1.13 At a certain elevation, the pilot of a...Ch. 1.9 - 1.14 Estimate the magnitude of the force, in Ibf,...Ch. 1.9 - 1.15 Determine the upward applied force, in Ibf,...Ch. 1.9 -
1.16 An object is subjected to an applied upward...Ch. 1.9 - 1.17 A communications satellite weighs 4400 N on...Ch. 1.9 - 1.18 Using local acceleration of gravity data from...Ch. 1.9 - 1.19 A town has a 1-million-gallon storage...Ch. 1.9 - 1.20 A closed system consists of 0.5 kmol of...Ch. 1.9 - 1.21 A 2-lb sample of an unknown liquid occupies a...Ch. 1.9 - Prob. 22PCh. 1.9 - 1.23 The specific volume of 5 kg of water vapor at...Ch. 1.9 - Prob. 24PCh. 1.9 - 1.25 As shown in Figure P1.25, a gas is contained...Ch. 1.9 - 1.26 As shown in Fig. P1.26, a vertical...Ch. 1.9 - 1.27 Three kg of gas in a piston-cylinder assembly...Ch. 1.9 - 1.28 A closed system consisting of 4 lb of a gas...Ch. 1.9 - 1.29 A system consists of carbon monoxide (CO) in...Ch. 1.9 - 1.30 Figure P1.30 shows a gas contained in a...Ch. 1.9 - 1.31 A gas contained within a piston-cylinder...Ch. 1.9 - Prob. 32PCh. 1.9 - 1.33 Figure P 1.33 shows a storage tank holding...Ch. 1.9 - 1.34 As shown in Figure PI.34, the exit of a gas...Ch. 1.9 - 1.35 The barometer shown in Fig. P1.35 contains...Ch. 1.9 - Prob. 36PCh. 1.9 - Figure P1.37 shows a tank within a tank, each...Ch. 1.9 - 1.38 As shown in Fig. PI.38, an underwater...Ch. 1.9 - 1.39 Show that a standard atmospheric pressure of...Ch. 1.9 - 1.40 A gas enters a compressor that provides a...Ch. 1.9 - 1.41 As shown in Figure P1.41. air is contained in...Ch. 1.9 - Prob. 42PCh. 1.9 - 1.43 The pressure from water mains located at...Ch. 1.9 - 1.44 Figure P1.44 shows a tank used to collect...Ch. 1.9 - 1.45 If the water pressure at the base of the...Ch. 1.9 - 1.46 As shown in Figure P1.46. an inclined...Ch. 1.9 - 1.47 Figure P1.47 shows a spherical buoy, having a...Ch. 1.9 - 1.48 Because of a break in a buried oil storage...Ch. 1.9 - 1.49 Figure P1.49 shows a closed tank holding air...Ch. 1.9 - 1.50 The 30-year average temperature in Toronto,...Ch. 1.9 - 1.51 Convert the following temperatures from °F to...Ch. 1.9 - Prob. 52PCh. 1.9 - 1.53 A cake recipe specifies an oven temperature...Ch. 1.9 - 1.54 Does the Rankine degree represent a larger or...Ch. 1.9 - 1.55 Figure P1.55 shows a system consisting of a...Ch. 1.9 - What is (a) the lowest naturally occurring...Ch. 1.9 - 1.57 Air temperature rises from a morning low of...Ch. 1.9 - 1.58 For liquid-in-glass thermometers, the...
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