Before the widespread use of mechanical refrigeration, cooling was provided by ice, which was delivered by icemen and stored in an icebox. In a current application, blocks of ice at Tice = 32°F with a total mass of mice = 500 lbm are placed in a large food-storage icebox that is used to keep food at Tfood = 45°F on a day in which the outdoor temperature is Tamb = 78°F. The rate of heat loss through the walls of the ice box is Q = 2900 Btu/hr.a.) Estimate the amount of time the ice it will take this ice to melt.b.) Compare the rate of cooling provided in ton units to the mass of ice in tons.c.) Define and calculate efficiency for this process.d.) Determine the change in exergy of the ice in this process.e.) Calculate the Second-Law efficiency for this process.

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Before the widespread use of mechanical refrigeration, cooling was provided by ice, which was delivered by icemen and stored in an icebox. In a current application, blocks of ice at T_ice = 32°F with a total mass of m_ice = 500 lb_m are placed in a large food-storage icebox that is used to keep food at T_food = 45°F on a day in which the outdoor temperature is T_amb = 78°F. The rate of heat loss through the walls of the ice box is Q = 2900 Btu/hr.

a.) Estimate the amount of time the ice it will take this ice to melt.

b.) Compare the rate of cooling provided in ton units to the mass of ice in tons.

c.) Define and calculate efficiency for this process.

d.) Determine the change in exergy of the ice in this process.

e.) Calculate the Second-Law efficiency for this process.

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