A heat exchanger to preheat oil for a furnace was designed without considering the possibility of scale formation, and the overall heat transfer coefficient based on the fuel oil side was 3200 k J/m2 hr degree. What would be the corrected coefficient of heat transfer if a fouling factor of 0.00025 m2 hr degree/k J for the fuel oil is taken into account?

A heat exchanger to preheat oil for a furnace was designed without con

1.	A heat exchanger to preheat oil for a furnace was designed without considering the possibility of scale formation, and the overall heat transfer coefficient based on the fuel oil side was 3200 k J/m2 hr degree. What would be the corrected coefficient of heat transfer if a fouling factor of 0.00025 m2 hr degree/k J for the fuel oil is taken into account?
A.	1777.78 k J/m<sup>2</sup> hr degree
B.	1666.78 k J/m<sup>2</sup> hr degree
C.	1555.78 k J/m<sup>2</sup> hr degree
D.	1444.78 k J/m<sup>2</sup> hr degree
Answer» B. 1666.78 k J/m<sup>2</sup> hr degree

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