A 2 5 m diameter sphere contains a mixture of ice and water at 0C and is buried in a semi infinite medium having a thermal conductivity of 0 2 W m C The top surface of the medium is isothermal at 30C and the sphere centerline is at a depth of 8 5 m Calculate the heat lost by the sphere ...

A 2.5-m-diameter sphere contains a mixture of ice and water at 0C and is buried in a

Question:

A 2.5-m-diameter sphere contains a mixture of ice and water at 0ºC and is buried in a semi-infinite medium having a thermal conductivity of 0.2 W/m· ºC. The top surface of the medium is isothermal at 30ºC and the sphere centerline is at a depth of 8.5 m. Calculate the heat lost by the sphere.