A1-mm-thick copper plate (k 386 W/m · °C) is sandwiched
between two 5-mm-thick epoxy boards (k 0.26
W/m · °C) that are 15 cm
20 cm in size. If the thermal contact
conductance on both sides of the copper plate is estimated
to be 6000 W/m · °C, determine the error involved in the total
thermal resistance of the plate if the thermal contact conductances
are ignored.