Question

Heat flows through a wooden board 30mm thick at 0.0086 W/cm² when one of it's sides is 20°C warmer than the other. Determine the thermal conductivity of the wood.​

Answer 1

Answer:

We know that thermal conductivity is given by

Given the length of the two sides of the board L = 30 mm = 0.03 m

Heat flowing per sq cm of area = 0.0086 W/cm

Thus, Q/A = (0.086 ×3) W/cm² = (0.0086 × 10000 × 3) W/m² = 258 W/m²

Temperature difference ?T = 20°C = 20 K

Thus, the thermal conductivity of the wood

k = 0.387 W/mK