Design a shell$-$and$-$tube exchanger for the following duty: $30,000k\frac{g}{h}$ of kerosene $(42\frac{A}{P}$I $)$ leaves the base of a kerosene side$-$stripping column at $200C$ and is to be cooled to $90C$ by exchange with $80,000k\frac{g}{h}$ light crude oil $)$ coming from storage at $40C.$ The kerosene enters the exchanger at a pressure of $5$ bar and the crude oil at $6\mathrm{.}5$ bar. A pressure drop of $0\mathrm{.}8$ bar is permissible on both streams. Allowance should be made for fouling on the crude stream and on the kerosene stream.