A large thick layer of ice is initially at a uniform temperature of 20C If the surface temperature is suddenly raised to 1C, calculate the time required for the temperature at a depth of 1 5 cm to reach 11C The properties of ice are 57 lbm ft3, cp 0 46 Btu lbm F, k 1 28 Btu h ft F, 0 048 ft2 h ...

A large thick layer of ice is initially at a uniform temperature of 20C. If the surface

Question:

A large thick layer of ice is initially at a uniform temperature of −20ºC. If the surface temperature is suddenly raised to −1ºC, calculate the time required for the temperature at a depth of 1.5 cm to reach −11ºC. The properties of ice are ρ = 57 lbm/ft3, cp = 0.46 Btu/lbm · ºF, k = 1.28 Btu/h · ft · ºF, α = 0.048 ft2/h.