A 5-cm-thick beef steak is being frozen in a -30°C room. The product has 73% moisture content, density of 970 kg/m³, and thermal conductivity (frozen) of 1.1 W/(m K). Estimate the freezing time using Plank's equation. The product has an initial freezing temperature of – 1.75°C, and the movement of air in the freezing room provides a convective heat-transfer coefficient of 5 W/(m² K).

A 5-cm-thick beef steak is being frozen in a -30°C room. The product has 73% moisture content, density of 970 kg/m³, and thermal conductivity (frozen) of 1.1 W/(m K). Estimate the freezing time using Plank's equation. The product has an initial freezing temperature of – 1.75°C, and the movement of air in the freezing room provides a convective heat-transfer coefficient of 5 W/(m² K).

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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Question

7.3 A 5-cm-thick beef steak is being frozen in a -30°C room.
The product has 73% moisture content, density of 970 kg/m,
and thermal conductivity (frozen) of 1.1 W/(m K). Estimate
the freezing time using Plank's equation. The product has an
initial freezing temperature of -1.75°C, and the movement of
air in the freezing room provides a convective heat-transfer
coefficient of 5 W/(m K).

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