A copper pipe (k = 350 W/m K) having inner diameter of 1.75 cm and 2.0 cm outside diameter conveys water and the oil flows through the annular passage between this pipe and a steel pipe. On the water side, the film coefficient is 4600 W/m2 K and the fouling factor is 0.00034 m2 K/W. The corresponding values for the oil side are 1200 W/m2 K and 0.00086 m2 K/W. Estimate the overall heat transfer coefficient between the oil and water

A copper pipe (k = 350 W/m K) having inner diameter of 1.75 cm and 2.0

1.	A copper pipe (k = 350 W/m K) having inner diameter of 1.75 cm and 2.0 cm outside diameter conveys water and the oil flows through the annular passage between this pipe and a steel pipe. On the water side, the film coefficient is 4600 W/m2 K and the fouling factor is 0.00034 m2 K/W. The corresponding values for the oil side are 1200 W/m2 K and 0.00086 m2 K/W. Estimate the overall heat transfer coefficient between the oil and water
A.	235.16 W/m<sup>2 </sup>K
B.	335.16 W/m<sup>2 </sup>K
C.	435.16 W/m<sup>2 </sup>K
D.	535.16 W/m<sup>2 </sup>K
Answer» D. 535.16 W/m<sup>2 </sup>K

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