(Solution) - The heat transfer coefficient on the inside of a copper -(2025 Original AI-Free Solution)

Paper Details

The heat transfer coefficient on the inside of a copper tube (1.9 cm ID and 2.3 cm OD) is 500 W/(m2 K) and 120 W/(m2 K) on the outside, but a deposit with a fouling factor of 0.009 (m2 K)/W (based on the tube outside diameter) has built up over time. Estimate the percent increase in the overall heat transfer coefficient if the deposit were removed.
GIVEN
Heat transfer through a copper tube
Heat transfer coefficients
Inside (hi) = 500 W/(m2 K)
Outside (ho) = 120 W/(m2 K)
Tube diameters
Inside (Di) = 1.9 cm = 0.019 m
Outside (Do) = 2.3 cm = 0.023 m
Fouling factor (Rd) = 0.009 (m2 K)/W
ASSUMPTIONS
Constant thermal conductivity properties
The copper ispure