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Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m³, c, = 3010 J/kg°C, and k 0.490 W/m°C, determine; (a) the center = temperature of the apple in 30 minutes, (b) the actual amount of heat

Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m³, c, = 3010 J/kg°C, and k 0.490 W/m°C, determine; (a) the center = temperature of the apple in 30 minutes, (b) the actual amount of heat

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m3, cp = 3010 J/kg-°C, and k = 0.490 W/m°C, determine; (a) the center temperature of the apple in 30 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.
Transcribed Image Text:Q) An apple has been put into a freezer at (-13°C) to be cooled. Initially, the apple is at a uniform temperature of 23°C. The convection heat transfer coefficient on its surface is 7 W/m2.°C. Assuming the apple as a sphere having a diameter of 6.5-cm and taking its properties as p = 930 kg/m3, cp = 3010 J/kg-°C, and k = 0.490 W/m°C, determine; (a) the center temperature of the apple in 30 minutes, (b) the actual amount of heat transfer from the apple, and (c) the final equilibrium temperature of the apple. Hint: consider the temperature is a function of location and time.
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