A box ,total surface area 2.20m² and a wall thickness 6cm is made of an insulating material.10 W electric heater inside the box maintains the inside temperature at 20°C above the outside temperature. thermal conductivity of the insulating material?

1 Answer
Nov 30, 2015

Answer:

#kappa=0.0136"W/(m.K)"#

Explanation:

Thermal conductivity can be thought of as a the flux of heat (energy per unit area per unit time) divided by the temperature gradient(temperature difference per unit length).

The expression is:

#kappa=(DeltaQ)/(Deltat).(1)/(A).(x)/(T)#

Putting in the values:

#kappa=10xx1/2.2xx(0.06)/(20)#

#:.kappa=0.0316"W/(m.K)"#