Explanation Given: Thermal conductivity of the steel ( k 23 b ) is 50 W / m ⋅ K . Thermal conductivity of the inner wall space with insulation ( k 23 a ) is 0.03 W / m ⋅ K . Thermal conductivity of the inner wall gypsum board ( k 12 ) is 0.5 W / m ⋅ K . Thermal conductivity of the outer wall ( k 34 ) is 1 W / m ⋅ K . Calculation: Determine the thermal resistance R 12 . R 12 = t 12 k 12 = 0.01 m ( 0.5 W / m ⋅ ° C ) = 0.02 m 2 ⋅ ° C / W Determine the thermal resistance R 23 a . R 23 a = t 23 L a k 23 a ( L a + L b ) = ( 0.08 m ) 0.6 m ( 0.03 W / m ⋅ ° C ) ( 0.6 m + 0.005 m ) = 2.645 m 2 ⋅ ° C / W Determine the thermal resistance R 23 b . R 23 b = t 23 L b k 23 b ( L a + L b ) = ( 0.08 m ) 0.005 m ( 50 W / m ⋅ ° C ) ( 0.6 m + 0.005 m ) = 1.32 m 2 ⋅ ° C / W Determine the thermal resistance R 34

5th Edition

ISBN: 9780078027680

Author: Yunus A. Cengel Dr., Robert H. Turner, John M. Cimbala

Publisher: McGraw-Hill Education

See similar textbooks

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and ch…

Videos

Question

Chapter 17, Problem 126RQ

To determine

The temperature on the interior brick surface.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 17, Problem 125RQ

Chapter 17, Problem 127RQ

Students have asked these similar questions

A gearbox has permanent shaft positions defined by the bearing mounting positions, but the gear ratio can be changed by changing the number of teeth in the pinion and gear. To achieve similar power transmission ability for different gear ratios, a manufacturer chooses to have the same module for two different gearboxes. One of the gaerboxes has a pinion with 22 teeth, a gear with 68 teeth, and a center distance of 225mm. How large is the gear module and which gear ratios are possible for a pinion with 22 or more teeth using the same module?

A gear train has a 50.3 mm circular pitch and a 25 degree pressure angle and meshes with a pinion having 12 teeth Design this gear train to minimize its volume and the total number of teeth. Obtain the pitch diameters the number of teeth the speed ratio the center distance and the module of this gear train. The gearbox housing has a diameter of 620mm

Handwritten solution required ,strictly do not use CHATGPT. MECHANICAL ENGG

Chapter 17 Solutions

Fundamentals of Thermal-Fluid Sciences

Ch. 17 - Prob. 1P Ch. 17 - Consider heat conduction through a plane wall....Ch. 17 - What does the thermal resistance of a medium...Ch. 17 - Can we define the convection resistance for a unit...Ch. 17 - Consider steady heat transfer through the wall of...Ch. 17 - How is the combined heat transfer coefficient...Ch. 17 - Why are the convection and the radiation...Ch. 17 - Consider steady one-dimensional heat transfer...Ch. 17 - Someone comments that a microwave oven can be...Ch. 17 - Consider two cold canned drinks, one wrapped in a...

Ch. 17 - Consider a surface of area A at which the...Ch. 17 - How does the thermal resistance network associated...Ch. 17 - Consider steady one-dimensional heat transfer...Ch. 17 - Consider a window glass consisting of two...Ch. 17 - Prob. 15P Ch. 17 - Prob. 16P Ch. 17 - Prob. 17P Ch. 17 - Prob. 18P Ch. 17 - Prob. 19P Ch. 17 - Consider a power transistor that dissipates 0.2 W...Ch. 17 - A 1.0 m × 1.5 m double-pane window consists of two...Ch. 17 - Consider a 1.2-m-high and 2-m-wide glass window...Ch. 17 - Prob. 23P Ch. 17 - Prob. 24P Ch. 17 - Prob. 26P Ch. 17 - Prob. 27P Ch. 17 - Prob. 28P Ch. 17 - Prob. 29P Ch. 17 - Prob. 30P Ch. 17 - A 2-m × 1.5-m section of wall of an industrial...Ch. 17 - The wall of a refrigerator is constructed of...Ch. 17 - Prob. 34P Ch. 17 - Prob. 35P Ch. 17 - Prob. 36P Ch. 17 - What is thermal contact resistance? How is it...Ch. 17 - Will the thermal contact resistance be greater for...Ch. 17 - Explain how the thermal contact resistance can be...Ch. 17 - A wall consists of two layers of insulation...Ch. 17 - A plate consists of two thin metal layers pressed...Ch. 17 - Consider two surfaces pressed against each other....Ch. 17 - Prob. 43P Ch. 17 - Prob. 44P Ch. 17 - Prob. 45P Ch. 17 - Prob. 46P Ch. 17 - Prob. 47P Ch. 17 - Prob. 48P Ch. 17 - Prob. 49P Ch. 17 - Prob. 50P Ch. 17 - Prob. 51P Ch. 17 - Prob. 52P Ch. 17 - Prob. 53P Ch. 17 - When plotting the thermal resistance network...Ch. 17 - Prob. 55P Ch. 17 - Prob. 56P Ch. 17 - Prob. 57P Ch. 17 - A typical section of a building wall is shown in...Ch. 17 - Prob. 59P Ch. 17 - Prob. 61P Ch. 17 - Prob. 62P Ch. 17 - Prob. 63P Ch. 17 - In an experiment to measure convection heat...Ch. 17 - What is an infinitely long cylinder? When is it...Ch. 17 - Can the thermal resistance concept be used for a...Ch. 17 - Consider a short cylinder whose top and bottom...Ch. 17 - Prob. 68P Ch. 17 - 50-m-long section of a steam pipe whose outer...Ch. 17 - Superheated steam at an average temperature 200°C...Ch. 17 - Steam exiting the turbine of a steam power plant...Ch. 17 - Repeat Prob. 17–72E, assuming that a 0.01-in-thick...Ch. 17 - A 2.2-mm-diameter and 10-m-long electric wire is...Ch. 17 - Prob. 76P Ch. 17 - Chilled water enters a thin-shelled 5-cm-diameter,...Ch. 17 - Steam at 450°F is flowing through a steel pipe (k...Ch. 17 - Prob. 79P Ch. 17 - Prob. 80P Ch. 17 - An 8-m-internal-diameter spherical tank made of...Ch. 17 - What is the critical radius of insulation? How is...Ch. 17 - Consider an insulated pipe exposed to the...Ch. 17 - A pipe is insulated to reduce the heat loss from...Ch. 17 - Prob. 86P Ch. 17 - Prob. 87P Ch. 17 - A 0.083-in-diameter electrical wire at 90°F is...Ch. 17 - Prob. 89P Ch. 17 - Prob. 90P Ch. 17 - Prob. 92P Ch. 17 - What is the reason for the widespread use of fins...Ch. 17 - What is the difference between the fin...Ch. 17 - The fins attached to a surface are determined to...Ch. 17 - Explain how the fins enhance heat transfer from a...Ch. 17 - How does the overall effectiveness of a finned...Ch. 17 - Hot water is to be cooled as it flows through the...Ch. 17 - Consider two finned surfaces that are identical...Ch. 17 - The heat transfer surface area of a fin is equal...Ch. 17 - Prob. 101P Ch. 17 - Prob. 102P Ch. 17 - Two plate fins of constant rectangular cross...Ch. 17 - Two finned surfaces are identical, except that the...Ch. 17 - A 4-mm-diameter and 10-cm-long aluminum fin (k =...Ch. 17 - Consider a very long rectangular fin attached to a...Ch. 17 - Consider a stainless steel spoon (k = 8.7...Ch. 17 - A DC motor delivers mechanical power to a rotating...Ch. 17 - A plane wall with surface temperature of 350°C is...Ch. 17 - Prob. 111P Ch. 17 - Steam in a heating system flows through tubes...Ch. 17 - Prob. 113P Ch. 17 - A hot surface at 100°C is to be cooled by...Ch. 17 - Prob. 116P Ch. 17 - A 40-W power transistor is to be cooled by...Ch. 17 - Prob. 118P Ch. 17 - Prob. 119RQ Ch. 17 - Cold conditioned air at 12°C is flowing inside a...Ch. 17 - Prob. 121RQ Ch. 17 - Prob. 122RQ Ch. 17 - Prob. 123RQ Ch. 17 - Prob. 124RQ Ch. 17 - Prob. 125RQ Ch. 17 - Prob. 126RQ Ch. 17 - Prob. 127RQ Ch. 17 - Prob. 128RQ Ch. 17 - Prob. 129RQ Ch. 17 - Prob. 130RQ Ch. 17 - Prob. 131RQ

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.