Fruit is impeded from ripening when it reaches high temperatures (>32°C). Farmer Joe is worried that Deleware's summer heat wave will affect the ripening of his ground cherries. The spherical fruit (1 cm in diameter) is surrounded by a spherical papery husk (λhusk = 0.3 W/m K) with an inner diameter of 2 cm and an outer diameter of 2.1 cm. The air in between the fruit and the husk is stagnant (λair = 0.03 W/m K). On a calm day in July, the deleware air (outside of the husk) is very warm, with a temperature of ~38°C and a heat transfer coefficient of h deleware,calm = 10 W/m 2K. (a) Sketch the system, labeling all temperatures, dimensions, and proportionality constants. (b) sketch the electrical analogy tothis system, labeling all temperatures, resistances, and heat flows (c) what is the overall resistance to heat transfer from the air in Deleware to the fruit?
Fruit is impeded from ripening when it reaches high temperatures (>32°C). Farmer Joe is
worried that Deleware's summer heat wave will affect the ripening of his ground cherries.
The spherical fruit (1 cm in diameter) is surrounded by a spherical papery husk (λhusk = 0.3
W/m K) with an inner diameter of 2 cm and an outer diameter of 2.1 cm. The air in between
the fruit and the husk is stagnant (λair = 0.03 W/m K). On a calm day in July, the deleware
air (outside of the husk) is very warm, with a temperature of ~38°C and a heat transfer
coefficient of h deleware,calm = 10 W/m 2K.
(a) Sketch the system, labeling all temperatures, dimensions, and proportionality constants.
(b) sketch the electrical analogy tothis system, labeling all temperatures, resistances, and heat flows
(c) what is the overall resistance to heat transfer from the air in Deleware to the fruit?
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