Chapter 10, Problem 10.8P

The heat transfer coefficient of a copper tube (1.9-cm II) and 2.3-em OD) is ${\text{500 W/m}}^{\text{2}}\text{K}$ on the inside and ${\text{120 W/m}}^{\text{2}}\text{K}$ on the outside, but a deposit with a fouling factor of $\text{0}{\text{.009 m}}^{\text{2}}\text{K/W}$ (based on the tube outside diameter) has built up over time. Estimate the percentage increase in the overall heat transfer coefficient if the deposit were removed.