A styrofoam box used to keep drinks cold at a picnic has a total wall area (including the lid) of 0.80m^2 and wall thickness of 2.0cm. it is filled with ice, water and cans of cola at 0 degrees celcius.(a) what is the rate of heat flow into the box if the temperature of the outside wall is 30 degrees celcius? (b)how much ice melts in one day ?

Question

A styrofoam box used to keep drinks cold at a picnic has a total wall area (including the lid) of 0.80m^2  and wall thickness of 2.0cm. it is filled with ice, water and cans of cola at 0 degrees celcius.(a) what is the rate of heat flow into the box if the temperature of the outside wall is 30 degrees celcius? (b)how much ice melts in one day ?

ganpat · Answer

1.  Q = -(K)A (dt/dx)

Q = -K (0.8) (30-0)/ (0.02) .... 

i dont know, K (co-efficient of conduction) for styrofoam box..