A 2-nom sch 40S stainless steel pipe (k = 16.5 W/m-K) is being used in a heat

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A 2½-nom sch 40S stainless steel pipe (k = 16.5 W/m-K) is being used in a heat exchanger application. The pipe is 1-m long. The convective heat transfer coefficients on the inside and outside of the pipe are 1,590 W/m2-K and 1,980 W/m2-K, respectively.
The fouling factor on each side of the pipe is 0.0002 m2-K/W. Determine the UA product for the pipe under the following conditions,

a. When it is first put into service (i.e., clean)

b. After being in service for one year without maintenance (i.e., fouled)

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