Explanation Given: Thermal conductivity is 0.4 Btu / h ⋅ ft ⋅ ° F . Height of the wall is 9ft. Thickness of the wall is 1ft. The temperature of the house is 70 ° F . Temperature at the inner surface of the wall is 55 ° F . Average temperature of the outer surface during 10 hour day time is 45 ° F . Average temperature of the outer surface during 14 hour night time is 35 ° F . Electricity price is $ 0.09 / kWh . Calculation: Calculate the heat transfer area. A = 2 ( 50 ft × 9 ft + 35 ft × 9 ft ) = 1530 ft 2 The rate of heat lost during day time is, Q ˙ d a y = k A T 1 − T 2 L = ( 0.4 Btu / h ⋅ ft ⋅ ° F ) ( 1530ft 2 ) ( 55 − 45 ) ° F 1 ft = 6120 Btu / h The rate of heat lost during night time is, Q ˙ n i g h t = k A T 1 − T 2 L = ( 0

Fundamentals Of Thermal-fluid Sciences In Si Units

5th Edition

ISBN: 9789814720953

Author: Yunus Cengel, Robert Turner, John Cimbala

Publisher: McGraw-Hill Education

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When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a bur…

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Chapter 17, Problem 17P

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The heat lost from the house and the cost of it.

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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

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