HEAT+MASS TRANSFER:FUND.+APPL.6th EditionCENGEL Publisher: RENT MCGISBN: 9780073398198
HEAT+MASS TRANSFER:FUND.+APPL.
Solutions for HEAT+MASS TRANSFER:FUND.+APPL.
Problem 1CP:
Consider heat conduction through a wall of thickness L and area A. Under what conditions will the...Problem 2CP:
Consider heat conduction through a plane wall. Does the energy content of the wall change during...Problem 4CP:
Can we defme the convection resistance for a unit surface area as the inverse of the convection heat...Problem 5CP:
Consider steady heat transfer through the wall of a room in winter. The convection heat transfer...Problem 6CP:
How is the combined heat transfer coefficient defmed? What convenience does it offer in heat...Problem 7CP:
Why are the convection and the radiation resistances at a surface in parallel instead of being in...Problem 8CP:
Consider steady one-dimensional heat transfer through a plane wall exposed to convection from both...Problem 9CP:
Someone comments that a microwave oven can be viewed as a conventional oven with zero convection...Problem 10CP:
Consider two cold canned drinks, one wrapped in a blanket and the other placed on a table in the...Problem 11CP:
The bottom of a pan is made of a 4-mm-thick aluminum layer. In page 219 order to increase the rate...Problem 12CP:
Consider a surface of area A at which the convection and radiation heat transfer coefficients are...Problem 13CP:
How does the thermal resistance network associated with a single-layer plane wall differ from the...Problem 14CP:
Consider steady one-dimensional heat transfer through a multilayer medium. If the rate of heat...Problem 15CP:
Consider a window glass consisting of two 4-mm-thick glass sheets pressed tightly against each...Problem 17P:
Consider a person standing in a room at 20C with an exposed surface area of 1.7 m2. The deep body...Problem 18EP:
Consider an electrically heated brick house (k=0.40Btu/h.ftF) and whose walls are 9 ft high and 1 ft...Problem 19P:
A12-cm18-cm circuit board houses on its surface 100 closely spaced logic chips, each dissipating...Problem 20P:
Water is boiling in a 25-cm-diameter aluminum pan (k=237W/m.K) and at 95C. Heat is transferred...Problem 21P:
A cylindrical resistor element on a circuit board dissipates 0.15 W of power in an environment at...Problem 23P:
A1.0m1.5m double-pane window consists of two 4-mm-thick layers of glass (k=0.78W/m.K) and that are...Problem 29P:
To defog the rear window of an automobile, a very thin transparent heating element is attached to...Problem 30P:
A transparent film is to be bonded onto the top surface of a solid plate inside a heated chamber....Problem 31P:
To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blowii over...Problem 36P:
Heat is to be conducted along a circuit board that has a copper layer on one side. The circuit board...Problem 38P:
Consider a house that has a 10m20-m base and a 4-rn-high wall. All four walls of the house have an...Problem 47CP:
A waII consists of two layers of insulation pressed against each other. Do we need to be concerned...Problem 49CP:
Consider two surfaces pressed against each other. Now the air at the interface is evacuated. Will...Problem 51P:
Two 5-cm-diameter, 15-cm-long aluminum bars (k=176W/mK). and with ground surfaces are pressed...Problem 53P:
Two identical aluminum plates with thickness of 30 cm are pressed against each other at an average...Problem 54P:
A tvolayer wall is made of two metal plates, with surface roughness of about 25 m, pressed together...Problem 56P:
An aluminum plate and a stainless steel plate are pressed against each other at an average pressure...Problem 62CP:
What are the two approaches used in the development of the thermal resistance network for...Problem 63CP:
The thermal resistance networks can also be used approximately for multidimensional problems. For...Problem 64CP:
When plotting the thermal resistance network associated with a heat transfer problem, explain when...Problem 65P:
A 10-cm-thick vall is to be constructed with 2.5-rn-long wood studs (k=0.11W/m.K and that have a...Problem 73P:
A 12-m-long and 5-m-high wall is constructed of two layers of 1 -cm-thick sheetrock (k=0.17W/m.K)...Problem 78CP:
What is an infinitely long cylinder? When is it proper to treat an actual cylinder as being...Problem 79CP:
Can the thermal resistance concept be used for a solid cylinder or sphere in steady operation?...Problem 80CP:
Consider a short cylinder whose top and bottom surfaces are insulated. The cylinder is initially at...Problem 97P:
Liquid hydrogen is flowing through an insulated pipe (k=23W/m.K,Di=3cm,Do=4cmandL=20m). The pipe is...Problem 98P:
Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia...Problem 99P:
A mixture of chemicals is flowing in a pipe (k=14W/m.K,Di=2.5cm,Do=3cmandL=10m). and During the...Problem 100P:
Ice slurry is being transported in a pipe (k=15W/m.K,Di=2.5cm,Do=3cmandL=5m) and with an iliner...Problem 104CP:
What is the critical radius of insulation? How is it defined for a cylindrical layer?Problem 108CP:
A pipe is insulated such that the outer radius of the insulation is less than the critical radius....Problem 109EP:
A 0.083-in-diameter electrical wire at 90F is covered by 0.02-in-thick plastic insulation...Problem 110EP:
Repeat Prob. 3-109E, assuming a thermal contact resistance of 0.01 1h.ft2 .F/Btu at the interface of...Problem 113CP:
Hot air is to be cooled as it is forced to flow through the tubes exposed to atmospheric air. Fins...Problem 116CP:
The fins attached to a surface are determined to have an effectiveness of 0.9. Do you think the rate...Problem 117CP:
Explain how the fins enhance heat transfer from a surface. Also, explain how the addition of tins...Problem 118CP:
How does the overall effectiveness of a finned surface differ from the effectiveness of a single...Problem 119CP:
Hot water is to be cooled as it flows through the tubes exposed to atmospheric air. Fins are to be...Problem 120CP:
Consider two finned surfaces that are identical except that the fins on the first surface are fonned...Problem 121CP:
The heat transfer surface area of a fin is equal to the sum of all surfaces of the fin exposed to...Problem 122CP:
Does the (a) efficiency and (b) effectiveness of a fin increase or decrease as the fin length is...Problem 123CP:
Two pin fins are identical, except that the diameter of one of them is twice the diameter of the...Problem 124CP:
Two plate fins of constant rectangular cross section are identical, except that the thickness of one...Problem 125CP:
Two finned surfaces are identical, except that the convection heat transfer coefficient of one of...Problem 126P:
Obtain a relation for the fin efficiency for a fin of constant cross-sectional area perimeter p,...Problem 128P:
Consider a very long rectangular fin attached to a flat surface such that the temperature at the end...Problem 147P:
The human body is adaptable to extreme climatic conditions and keeps the body core and skin...Problem 148P:
Consider the conditions of Example 3-14 in the text for two different environments of air and water...Problem 149P:
Consider the conditions of Example 3-14 in the text except that the ambient air is at a temperature...Problem 154P:
A thin-walled cylindrical container is placed horizontally on snow-covered ground. The container is...Problem 165P:
Consider a house with a flat roof whose outer dimensions are 12m12m. and The outer walls of the...Problem 167P:
Radioactive material, stored in a spherical vessel of diameter is buried under D=3.5m, ground at a...Problem 168CP:
What is the R-value of a wall? How does it differ from the unit thermal resistance of the wall? How...Problem 169CP:
What is effective emissivity for a plane-parallel airspace? How is it determined? How is radiation...Problem 171CP:
What is a radiant barrier? What kinds of materials are suitable for use as radiant barriers? Is it...Problem 172CP:
Consider a house whose attic space is ventilated effectively so that the air temperature in the...Problem 179P:
Determine the winter R-value and the U-factor of a masonry wall that consists of following layers:...Problem 180P:
The overall heat transfer coefficient (the U-value) of a wall under winter design conditions is...Problem 182P:
Determine the summer and winter R-values. in m2 . C/W, of a masonry wall that consists of 1 00-nun...Problem 183EP:
The overall heat transfer coefficient of a wall is determined to be U=0.075Btu/h.ft2.oF under the...Problem 184P:
Two homes are identical, except that the walls of one house consist of 200-mni lightweight concrete...Problem 186P:
Consider two identical people each generating 60 V of metabolic heat steadily while doing sedentary...Problem 187P:
Cold conditioned air at 12C is flowing inside a 1.5-cm-thick square aluminum (k=237W/m.k) and duct...Problem 188P:
Hot water is flowing at an average velocity of 1.5 ins through a cast iron pipe (k=52W/m.k) and...Problem 198P:
A total of 10 rectangular aluminum fins (k=203W/m.K) and are placed on the outside flat surface of...Problem 200P:
A plane wall surface at 200C is to be cooled with aluminum pin fins of parabolic profile with blunt...Problem 205P:
A 0.6-rn-diameter, 1.9-rn-long cylindrical tank containing liquefied natural gas (L.NG) at -160C is...Problem 208P:
A thin-walled spherical tank is buried in the ground at a depth of 3 in. The tank has a diameter of...Problem 209P:
Heat is lost at a rate of 275 W per m2 area of a 1 5-cm-thick wall with a thermal conductivity of...Problem 211P:
Heat is generated steadily in a 3-cm-diameter spherical ball. The ball is exposed to ambient air at...Problem 217P:
Consider two walls. A and B, with the same surface areas and the same temperature drops across their...Problem 219P:
A room at 20C air temperature is losing heat to the outdoor air at 0C at a rate of 1000 W through a...Problem 221P:
A 1-cm-diameter, 30cm-long fin made of aluminum (k=237W/m.K) and is attached to a surface at 80C....Problem 222P:
A hot surface at 80C in air at 20C is to be cooled by attaching 10-cm-long and 1-cm- diameter...Problem 223P:
A cylindrical pin fin of diameter 0.6 cm and length of 3 cm with negligible heat loss from the tip...Problem 224P:
A 3-cm-long. 2-nuti x 2-mm rectangular cross-section aluminum fin (k=237W/m.K) and is attached to a...Problem 225P:
Two finned surfaces with long fins are identical, except that the convection heat transfer...Problem 226P:
A 20-cm-diameter hot sphere at 120C is buried in the ground with a thermal conductivity of 1.2 W/mK....Problem 227P:
A 25-cm-diameter, 2.4-rn-long vertical cylinder containing ice at 0C is buried right under the...Problem 229P:
The walls of a food storage facility are made of a 2-cm-thick layer of wood (k=0.1W/m.K) and in...Problem 234P:
The fin efficiency is defined as the ratio of the actual heat transfer from the fin to (a) The beat...Problem 236P:
In the United States, building insulation is specified by the R-value (thermal resistance in h.ft2...Problem 238P:
A plane brick wall (k=0.7W/m.K) and is 10 cm thick. The thermal resistance of this wall per unit of...Problem 239P:
The temperature in deep space is close to absolute zero. which presents thermal challenges for the...Problem 240P:
In the design of electronic components, it is desirable to attach the electronic circuitry to a...Problem 241P:
Using cylindrical samples of the same material, devise an experiment to determine the thenual...Browse All Chapters of This Textbook
Chapter 1 - Introduction And Basic ConceptsChapter 2 - Heat Conduction EquationChapter 3 - Steady Heat ConductionChapter 4 - Transient Heat ConductionChapter 5 - Numerical Methods In Heat ConductionChapter 6 - Fundamentals Of ConvectionChapter 7 - External Forced ConvectionChapter 8 - Internal Forced ConvectionChapter 9 - Natural ConvectionChapter 10 - Boiling And Condensation
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