Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 18, Problem 3RQ
To determine
Write an algorithm to assign a letter grade in a course.
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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 18 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Ch. 18.1 - Create a written algorithm that determines the...Ch. 18.1 - Prob. 2CCCh. 18.1 - Create a flowchart that determines the dose of a...Ch. 18.1 - Create a flowchart that determines the state of...Ch. 18.2 - Prob. 5CCCh. 18.2 - Prob. 6CCCh. 18.3 - Assume the following variables have been defined:...Ch. 18.3 - Prob. 8CCCh. 18.3 - Write a short section of MATLAB code that will...Ch. 18.3 - Prob. 10CC
Ch. 18.3 - Prob. 11CCCh. 18.3 - Assume a user has responded to the question "Do...Ch. 18.3 - Assume a user has responded to the question "Do...Ch. 18.4 - Write MATLAB code to represent the following...Ch. 18.4 - Write MATLAB code to represent the following...Ch. 18.4 - Write a MATLAB function named sumTtUp that will...Ch. 18.4 - Prob. 17CCCh. 18.5 - A device constructed to throw various objects can...Ch. 18.6 - Prob. 19CCCh. 18.6 - Prob. 20CCCh. 18.7 - Write MATLAB code to modify the previous gravity...Ch. 18.7 - Write MAT LAB code using try-catch to ask the user...Ch. 18 - Create a written algorithm and flowchart to...Ch. 18 - The Occupational Safety Health Administration...Ch. 18 - Prob. 3ICACh. 18 - Create a flowchart that represents the following...Ch. 18 - Create an algorithm to classify a given altitude...Ch. 18 - Answer the following questions. a. For what...Ch. 18 - Answer the following questions. a. For what...Ch. 18 - For each task listed, write a single MAT LAB...Ch. 18 - Prob. 9ICACh. 18 - What is stored in variable A after each of the...Ch. 18 - What will be displayed by the following code in...Ch. 18 - Ask users to enter a matrix that could be any size...Ch. 18 - A menu is generated using the following code:...Ch. 18 - A menu is generated using the following code:...Ch. 18 - Write a program using if-elseif-else statements...Ch. 18 - Write a program using switch-case statements that...Ch. 18 - Prob. 17ICACh. 18 - Write a program that asks the user to enter the...Ch. 18 - Prob. 19ICACh. 18 - Assume you are required to generate the menus...Ch. 18 - Assume you are required to generate the menus...Ch. 18 - Prob. 22ICACh. 18 - Assume you are required to generate the menus...Ch. 18 - We go to a state-of-the-art amusement park. All...Ch. 18 - A phase diagram for carbon and platinum is shown....Ch. 18 - Prob. 27ICACh. 18 - Prob. 28ICACh. 18 - Prob. 29ICACh. 18 - The Apple TV is a personal video device created by...Ch. 18 - Prob. 2RQCh. 18 - Prob. 3RQCh. 18 - Create an algorithm to determine whether a given...Ch. 18 - The specific gravity of gold is 19.3. Write a...Ch. 18 - An unmanned X-43A scramjet test vehicle has...Ch. 18 - A rod on the surface of Jupiter's moon Callisto...Ch. 18 - The Eco-Marathon is an annual competition...Ch. 18 - Assume a variable R contains a single number....Ch. 18 - Prob. 10RQCh. 18 - Create a program to determine whether a...Ch. 18 - Create a program to determine whether a given Mach...Ch. 18 - Humans can see electromagnetic radiation when the...Ch. 18 - For the protection of both the operator of a...Ch. 18 - Prob. 15RQCh. 18 - Prob. 17RQCh. 18 - Your function should use polyfit to determine the...Ch. 18 - Prob. 19RQCh. 18 - Prob. 20RQCh. 18 - The variable grade can have any real number value...Ch. 18 - Write a MATLAB program that will allow the student...Ch. 18 - One of the 14 NAE Grand Challenges is Engineering...Ch. 18 - Prob. 25RQ
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- 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 usedarrow_forward25 mm Brass core E = 105 GPa 0 = 20.9 x 10 °C PROBLEM 2.49 The aluminum shell is fully bonded to the brass core and the assembly is unstressed at a temperature of 15°C. Considering only axial deformations, determine the stress in the aluminum when the temperature reaches 195°C. 60 mm Aluminum shell E = 70 GPa a = 23.6 × 10°Carrow_forwardThis is an old practice exam. The answers are OAB = 19.10 ksi OBC = 2.228 ksi OCD = −2.865 ksi v = 0.2792delta Ltot = 0.01585 in (increase) but whyarrow_forward
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