Number 2 A piece of beef steak 5 cm thick will be frozen in the freezer room -30 ° C. This product has a moisture content of 73%, a density of 970 kg / m3, and a thermal conductivity (frozen) of 1.1 W / (m K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75 ° C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 10 W/ (m2 K). identify : a. tf = Answer in hour
Number 2 A piece of beef steak 5 cm thick will be frozen in the freezer room -30 ° C. This product has a moisture content of 73%, a density of 970 kg / m3, and a thermal conductivity (frozen) of 1.1 W / (m K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75 ° C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 10 W/ (m2 K). identify : a. tf = Answer in hour
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Transcribed Image Text:Number 2
A piece of beef steak 5 cm thick will be frozen in the freezer room -30 ° C. This product has a moisture content of
73%, a density of 970 kg / m³, and a thermal conductivity (frozen) of 1.1 W/ (m K). Estimate the freezing time.
using the Plank equation. This product has an initial freezing temperature of -1.75 ° C, and the movement of air in
the freezing room gives a convective heat transfer coefficient of 10 W / (m² K). identify :
a. tf = Answer in hour
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