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150A+Section+Handout+Week+13 (1)

150A+Section+Handout+Week+13 (1) - safe temperature to...

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ChE150A Section handout week 13 Example 1 – cooking and cooling a hot dog a) If you were to boil a hot dog that was initially at 5°C, how long would it take for the center of the hot dog to reach 80°C? Assume that the boiling water is at 100°C and the heat transfer coefficient to the hot dog is 90 W/m 2 K. What is the error associated with assuming that the hot dog is an infinite cylinder? b) After the hot dog is cooked, how long should you let it cool before it reaches a
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Unformatted text preview: safe temperature to eat (let’s say 65°C)? Assume that the hot dog is around 80°C when removed from the boiling water and is exposed to air at room temperature. The heat transfer coefficient between the hot dog and the air is 10 W/m 2 K. Hot dog properties: d = 0.02m, L=0.18m, c p = 2500 J/kg*K, ρ = 800 kg/m 3 and k=0.6 W/mK. Example 2...
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