HEAT & MASS TRANSFER (LL) W/CONNECT CARD6th EditionCENGEL Publisher: MCGISBN: 9781266204166
HEAT & MASS TRANSFER (LL) W/CONNECT CARD
Solutions for HEAT & MASS TRANSFER (LL) W/CONNECT CARD
Problem 2CP:
What is the driving force for (a) heat transfer, (b) electric current flow; and (c) fluid flow?Problem 4CP:
What is the difference between the analytical and experimental approaches to heat transfer? Discuss...Problem 5CP:
What is the importance of modeling in engineering? How are the mathematical models for engineering...Problem 6CP:
When modeling an engineering process, how is the right choice made between a simple but crude and a...Problem 7CP:
On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he...Problem 8CP:
Consider two identical rooms, one with a refrigerator in it and the other without one. If all the...Problem 12CP:
An ideal gas is heated from 50C to 80C (a) at constant volume and (b) at constant pressure. For...Problem 14CP:
What are the mechanisms of energy transfer to a closed system? How is heat transfer distinguished...Problem 15EP:
A logic chip used in a computer dissipates 3 W of power in an environment at 120F and has a heat...Problem 16P:
Consider a 150-W incandescent lamp. The filament of the lamp is 5 cm long and has a diameter of 0.5...Problem 17P:
A 15-cm-diameter aluminum ball is to be heated form 80C and to an average temperature of 200C. and...Problem 18EP:
A 60-gallon water heated is initially filled with water at 50F. Determine how much energy (in Btu)...Problem 27P:
A 5-m6-m8-m room is to be heated by an electrical resistance heater placed in a short duct in the...Problem 29EP:
Air enters the duct of an air-conditioning system at 15 psia and 47F at a volume flow rate of 450ft3...Problem 32CP:
Which is a better heat conductor, diamond or silver?Problem 34CP:
Why is the thermal conductivity of superinsulation order of magnitude lower than the thermal...Problem 35CP:
Why do we characterize the heat conduction ability of insulators in terms of their apparent thermal...Problem 37CP:
Write down the expression for the physical laws that govern each mode of heat transfer, and identify...Problem 38CP:
How does heat conduction differ from convection?Problem 42CP:
Consider heat transfer a windowless wall of house on a winter day. Discuss the parameter that effect...Problem 43CP:
Consider heat loss through two walls of house on a winter night. The Walls are identical except that...Problem 44CP:
Consider two houses that are identical except that the walls are built using bricks in one house and...Problem 45CP:
Consider two walls of a house that are identical except that one is made of 10-cm-thick wood while...Problem 48P:
A wood slab with a thickness 0.05 m is subjected to a heat flux of 40 W/m2 . The left and right...Problem 51P:
The inner and outer surfaces of a 0.5-cm thick 2-m2-m glass in winter are 10C and 3C, respectively....Problem 54EP:
The north wall of an electrically heated home is 20ft long, 10ft high, and 1ft thick and is made of...Problem 58P:
A concreate wall a surface area of 20 m2 and a thickness of 0.30 m separates conditioned room air...Problem 63P:
Air at 20C with a convection heat transfer coefficient of 20 W/m2 .K blows over a pond. The surface...Problem 77EP:
Using the conversion factors between W and Btu/h, m and ft, and K and R, express the...Problem 78P:
The outer surface of a spacecraft in space has an emissivity of 0.8 and a solar absorptivity of 0.3....Problem 79P:
Consider a person whose expose surface are is 1.7 m2 , emissivity is 0.5, and surface temperature is...Problem 81P:
Two surfaces, one highly polished and the other heavily oxidized, are found to be emitting the same...Problem 82P:
A spherical interplanetary probe with a diameter of 2 m is sent out into the solar system. The probe...Problem 85CP:
Can a medium involve (a) conduction and convection, (b) conduction and radiation, or (c) convection...Problem 86CP:
The deep human body temperature of a healthy person remains constant at 37oC while the temperature...Problem 87CP:
We often turn the fan on in summer to help us cool. Explain how a fan makes us feel cooler in the...Problem 91P:
An electronic package with a surface area of 1 m2 placed in an orbiting space station is exposed to...Problem 92P:
Consider steady heat transfer between two large parallel plates at constant temperatures of T1=290K...Problem 95EP:
A 2-in-diameter spherical ball whose surface is maintained at a temperature of 170oF is suspended in...Problem 98P:
A 3-m-internal-diameter spherical tank made of 1-cm-thick stainless steel is use to store iced water...Problem 100P:
Solar radiation is incident on a 5-m2 solar absorber plate surface at a rate of 800 W/m2....Problem 104P:
An AISI 304 stainless steel sheet is going through an annealing process inside an electrically...Problem 114CP:
Why is the metabolic rate of women, in general, lower than that of men? What is the effect of...Problem 115CP:
What is asymmetric thermal radiation How does it cause thermal discomfort in the occupants of a...Problem 118CP:
Why is it necessary to ventilate buildings? What is the effect of ventilation on energy consumption...Problem 119P:
Consider a house in Atlanta, Georgia, that is maintained at 22oC and has a total of 20 m2 of window...Problem 121P:
A 4m5m6m and room is to be heated by one ton (1000 kg) of liquid water contained in a tank placed in...Problem 122P:
Engine valves (cp=440J/kg.Kandp=7840kg/m3) are to be heated from 40oC to 800oC in 5 min in the heat...Problem 125P:
A 0.3 -cm-thick, 12-cm-high, and 18-cm-long circuit board houses 80 closely spaced logic chips on...Problem 126P:
A 40-cm-long, 800-W electric resistance heating element with dieter 0.5 cm and surface temperature...Problem 127P:
It is well known that wind makes the cold air feel much colder as a result of the wind-chill effect...Problem 128P:
An engine block with a surface area measured to be 0.95 m2 generates a power output of 50 kW with a...Problem 132P:
Consider a person standing in a room maintained at 20oC at all times. The inner surfaces of the...Problem 143P:
A 2-kW electric resistance heater submerged in 30-kg water is turned on and kept on for 10 min....Problem 145P:
A cold bottled drink (m=2.5kg,cp=4200J/kg.K) at 5oC is left on a table in a room. The average...Problem 147P:
Air enters a 12-m-long, 7-cm-diameter pipe at 50oC at a rate of 0.06 kg/s. The air is cooled at an...Problem 149P:
Steady heat conduction occurs through a 0.3-m-thick,9-m3-m composite wall at a rate of 1.2 kW. If...Problem 150P:
Heat is lost through a brick wall (k=0.72W/m.K), which is 4 m long, 3 wide, and 25 cm thick at a...Problem 152P:
A 40-cm-long, 0.4-cm-diameter electric resistance wire submerged in water is used to determine the...Problem 155P:
Over 90 percent of the energy dissipated by an incandescent lightbulb is in the form of heat, not...Problem 156P:
On a still, cleat night, the sky appears to be a blackbody with an equivalent temperature of 250 K....Problem 159P:
A persons head can be approximated as a 25-cm-diameter sphere at 35oC with an emissivity of 0.95....Problem 160P:
A person standing in a room loses heat to the air in the room by convection and to the surrounding...Problem 161P:
Write an essay on how microwave ovens work, and explain how they cook much faster than conventional...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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