Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5 cm
Question:
Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5 cm thick, for reinforcement. If the total cross-sectional area of the nails is 0.5% of the wall area, determine the unit thermal conductance of the composite wall and the percent of the total heat flow that passes through the nails when the temperature difference across the wall is 25°C. Neglect contact resistance between the wood layers.
GIVEN
Wood wall
Two layers 0.025 m thick each
Nail cross sectional area of nails = 0.5% of wall area
Temperature difference (???T) = 25°C
ASSUMPTIONS
One dimensional heat transfer through the wall
Steady state prevails
Contact resistance between the wall layers isnegligible
Step by Step Answer:
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn