Discussion Forum
Que.  Heat is transferred from a hot fluid to a cold one through a plane wall of thickness (δ), surface area (A) and thermal conductivity (k). The thermal resistance is 
a.  1/A (1/h₁ + δ/k + 1/h₂) 
b.  A (1/h₁ + δ/k + 1/h₂) 
c.  1/A (h₁ + δ/k + h₂) 
d.  A (1/h₁ + δ/k + 1/h₂) 
Correct Answer:1/A (1/h₁ + δ/k + 1/h₂)
