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Extra resources for Heat Transfer: A Practical Approach (2nd Edition)
1–9 T1 OPAQUE SOLID T2 1 mode Conduction T1 GAS T2 Radiation 2 modes Conduction or convection T1 VACUUM Radiation T2 1 mode FIGURE 1–38 Although there are three mechanisms of heat transfer, a medium may involve only two of them simultaneously. ■ SIMULTANEOUS HEAT TRANSFER MECHANISMS We mentioned that there are three mechanisms of heat transfer, but not all three can exist simultaneously in a medium. For example, heat transfer is only by conduction in opaque solids, but by conduction and radiation in semitransparent solids.
00196 m2)(15°C) Discussion Perhaps you are wondering if we really need to use two samples in the apparatus, since the measurements on the second sample do not give any additional information. It seems like we can replace the second sample by insulation. Indeed, we do not need the second sample; however, it enables us to verify the temperature measurements on the first sample and provides thermal symmetry, which reduces experimental error. EXAMPLE 1–7 Conversion between SI and English Units An engineer who is working on the heat transfer analysis of a brick building in English units needs the thermal conductivity of brick.
A cold canned drink in a warm room, for example, eventually warms up to the room temperature as a result of heat transfer from the room to the drink through the aluminum can by conduction. The rate of heat conduction through a medium depends on the geometry of the medium, its thickness, and the material of the medium, as well as the temperature difference across the medium. We know that wrapping a hot water tank with glass wool (an insulating material) reduces the rate of heat loss from the tank.