$90,000$ lb$/$h of benzene will be heated from $75$ F to $145$ F by cooling a stream of or tho$-$ toluidine from $230$F to $150$F$.$ Inlet pressures are $45$ psia for ortho$-$toluidine and $50$ psia for benzene. A maximum pressure drop of $10$psi is specified for each stream. Properties of ortho$-$toluidine at $190$F are given below. Develop an initial configuration for a shell$-$and$-$tube heat exchanger to meet this ser vice.