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Chapter 14: Q22CQ (page 502)
When watching a daytime circus in a large, dark-coloured tent, you sense significant heat transfer from the tent. Explain why this occurs.
During the day, the sun's radiation will heat the tent, and you will receive heat from the tent via convection.
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When heat transfers into a system, is the energy stored as heat? Explain briefly.
If you place \({{\rm{0}}^{\rm{o}}}{\rm{C}}\) ice into \({{\rm{0}}^{\rm{o}}}{\rm{C}}\) water in an insulated container, what will happen? Will some ice melt, will more water freeze, or will neither take place?
In very humid climates where there are numerous bodies of water, such as in Florida, it is unusual for temperatures to rise above about 35o.C (95o)F In deserts, however, temperatures can rise far above this. Explain how the evaporation of water helps limit high temperatures in humid climates.
Consider a person outdoors on a cold night. Construct a problem in which you calculate the rate of heat transfer from the person by all three heat transfer methods. Make the initial circumstances such that at rest the person will have a net heat transfer and then decide how much physical activity of a chosen type is necessary to balance the rate of heat transfer. Among the things to consider are the size of the person, type of clothing, initial metabolic rate, sky conditions, amount of water evaporated, and volume of air breathed. Of course, there are many other factors to consider and your instructor may wish to guide you in the assumptions made as well as the detail of analysis and method of presenting your results.
(a) Cherry-red embers in a fireplace are at 850ºC and have an exposed area of\({\bf{0}}{\bf{.200}}\;{{\bf{m}}^{\bf{2}}}\)and an emissivity of 0.980. The surrounding room has a temperature of 18.0ºC. If 50% of the radiant energy enters the room, what is the net rate of radiant heat transfer in kilowatts? (b) Does your answer support the contention that most of the heat transfer into a room by a fireplace comes from infrared radiation?
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