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Consider a carton of milk that is refrigerated to a temperature of TL = 5°C. The temperature in the kitchen on a hot summer day is T∞ = 30°C. With the four side walls of the box with dimensions L = 200 mm (height) and w = 100 mm (width), determine the heat transferred to the milk carton while it is on the kitchen counter for periods of t = 10 s, 60 s and 300 s before being replaced on the refrigerator. The convective coefficient associated with natural convection on the sides of the box is h = 10 W/(m²K). The emissivity of these surfaces is 0.90. Consider that the the temperature of the milk carton remains at 5°C during the proce

Consider a carton of milk that is refrigerated to a temperature of TL = 5°C. The temperature in the kitchen on a hot summer day is T∞ = 30°C. With the four side walls of the box with dimensions L = 200 mm (height) and w = 100 mm (width), determine the heat transferred to the milk carton while it is on the kitchen counter for periods of t = 10 s, 60 s and 300 s before being replaced on the refrigerator. The convective coefficient associated with natural convection on the sides of the box is h = 10 W/(m²K). The emissivity of these surfaces is 0.90. Consider that the the temperature of the milk carton remains at 5°C during the proce

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Consider a carton of milk that is refrigerated to a temperature of
TL = 5°C. The temperature in the kitchen on a hot summer day is T∞ = 30°C. With the four side walls of the box with dimensions L = 200 mm (height) and w = 100 mm (width), determine the heat transferred to the milk carton while it is on the kitchen counter for periods of t = 10 s, 60 s and 300 s before being replaced on the refrigerator.

The convective coefficient associated with natural convection on the sides of the box is h = 10 W/(m²K). The emissivity of these surfaces is 0.90. Consider that the the temperature of the milk carton remains at 5°C during the process.

q"conv Air q"rad T. = 30°C h = 10 W/m2-K L= 200 mm T, = 5°C m. ɛ= 0.90 w= 100 mm Milk
Transcribed Image Text:q"conv Air q"rad T. = 30°C h = 10 W/m2-K L= 200 mm T, = 5°C m. ɛ= 0.90 w= 100 mm Milk
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