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January 29, 2015

January 29, 2015

Posted by **Joy** on Saturday, August 24, 2013 at 7:13pm.

Calculate heat flux (J/ (sec m squared) at the walls.

- Material Science -
**Damon**, Saturday, August 24, 2013 at 7:36pmT within wall = 0 deg C

T outside wall = 30 deg C

wall thickness = .04 m

Heat power flux in Watts per m^2 = .06 W/m deg (30 deg)/.04 m = 45 Watts/m^2

since a Watt is a Joule per second, that is the answer.

Now the real question, which should be part B, is how long until the ice is melted :)

45 Watts/m^2 * 2400 *10^-4 m^2 = 10.8 Watts pouring out through the walls of the box

how many Joules to melt the ice?

3 kg *334000 J/kg = 10^6 Joules

so

10.8 Joules/second * T = 10^6 Joules

T = 92778 seconds to melt

or

92777/3600 = 26 hours to melt

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