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## Homework Statement

It is desired to heat 5130 kg/hr of cold benzene from 80 to 120℉ using hot toluene using double pipe heat exchanger. Toluene will be cooled from 160 to 100℉. The specific gravities at 68℉ are 0.88 and 0.87 respectively. A fouling factor of 0.001 should be provided for each stream, and the allowable pressure drop on each stream is 10 psi. A number of 9-ft hairpins of 3-by 2-in. IPS pipe are available. How many hairpins are required?

## Homework Equations

## The Attempt at a Solution

The calculated pressure drop is smaller than the allowable, so what changes to the original design can I implement. Should I consider reducing the flow area?

Attached Files contains my attempt at solving the problem whereas in the attached thumbnails contains the relevant figures and tables necessary to calculate the physical properties and heat transfer coefficients.[/B]