Explanation Given: Temperature of hot water is 70 ° C . Length of the pipe is 15 m. Thermal conductivity of the pipe is 52 W / m ⋅ K . Inner diameter of the pipe is 4 cm . Outer diameter of the pipe is 4.6 cm . Emissivity of the outer surface of the pipe is 0.7. Temperature of surrounding cold air is 10 ° C . The heat transfer coefficient on the outer surface is 15 W / m 2 ⋅ K . The heat transfer coefficient on the inner surface is 120 W / m 2 ⋅ K . Temperature of the walls of the basement is 10 ° C . Drop in temperature of water 3 ° C . Calculation: The heat transfer coefficient due to radiation is, h r a d = ε σ ( T 2 2 + T s u r r 2 ) ( T 2 + T s u r r ) = 0.75 ( 5.67 × 10 − 8 W / m 2 ⋅ K 4 ) [ ( 333 K ) 2 + ( 283 K ) 2 ] ( 333 K + 283K ) = 4.669 W / m 2 ⋅ K The total thermal resistance is, R t o t a l = R i + R p i p e + R o = 1 h i A i + ln ( D 2 / D 1 ) 2 π k 1 L + 1 h c o m b A o = 1 h i A i + ln ( D 2 / D 1 ) 2 π k 1 L + 1 ( h c o n v + h r a d ) A o = 1 ( 120 W / m 2 ⋅ K ) ( π × 0

Fundamentals Of Thermal-fluid Sciences In Si Units

5th Edition

ISBN: 9789814720953

Author: Yunus Cengel, Robert Turner, John Cimbala

Publisher: McGraw-Hill Education

See similar textbooks

Videos

Question

Chapter 17, Problem 79P

To determine

The rate of heat loss and the average velocity of water in the pipe.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 17, Problem 78P

Chapter 17, Problem 80P

Students have asked these similar questions

The hoist consists of a single rope and an arrangement of frictionless pulleys as shown. If the angle 0 = 59°, determine the force that must be applied to the rope, Frope, to lift a load of 4.4 kN. The three-pulley and hook assembly at the center of the system has a mass of 22.5 kg with a center of mass that lies on the line of action of the force applied to the hook. e ΘΕ B CC 10 BY NC SA 2013 Michael Swanbom Fhook Note the figure may not be to scale. Frope = KN HO Frope

Determine the tension developed in cables AB and AC and the force developed along strut AD for equilibrium of the 400-lb crate. x. 5.5 ft C 2 ft Z 2 ft D 6 ft B 4 ft A 2.5 ft

A block of mass m hangs from the end of bar AB that is 7.2 meters long and connected to the wall in the xz plane. The bar is supported at A by a ball joint such that it carries only a compressive force along its axis. The bar is supported at end B by cables BD and BC that connect to the xz plane at points C and D respectively with coordinates given in the figure. Cable BD is elastic and can be modeled as a linear spring with a spring constant k = 400 N/m and unstretched length of 6.34 meters. Determine the mass m, the compressive force in beam AB and the tension force in cable BC. Z D (c, 0, d) C (a, 0, b), A e B y f m BY NC SA x 2016 Eric Davishahl Values for dimensions on the figure are given in the following table. Note the figure may not be to scale. Variable Value a 8.1 m b 3.3 m C 2.7 m d 3.9 m e 2 m f 5.4 m The mass of the block is The compressive force in bar AB is The tension in cable S is N. kg.

Chapter 17 Solutions

Fundamentals Of Thermal-fluid Sciences In Si Units

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.