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The Zik-Zak Corporation recently bought a heat exchanger to cool 1000 lb/h of a light oil...

The Zik-Zak Corporation recently bought a heat exchanger to cool 1000 lb/h of a light oil (Cp = 0.5 Btu/lbm?F°) from 210°F to 60°F using chilled water (Cp = 1 Btu/lbm?F°) available at 50°F. The exchanger operates in countercurrent flow and has an area A0= 20 ft2. When it was new, the exchanger could operate with a water rate such that the exit temperature of the water was 80°F; after several months of operation, the water exit temperature has to be lowered to 55°F to obtain the required heat transfer rate.

               a.            What is the heat transfer rate in the exchanger?

               b.           What was U0 for the new exchanger?

c.            What was the fouling coefficient after several months of operation?

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