Question: A double pipe exchanger was oversized because no data were available on the rate at which dirt accumulated. The exchanger was originally designed to

A double pipe exchanger was oversized because no data were available on the rate at which dirt accumulated.

A double pipe exchanger was oversized because no data were available on the rate at which dirt accumulated. The exchanger was originally designed to cool 13,000 lb/hr of 100 per cent acetic acid from 250 to 150F by heating 19,000 lb/hr of butyl alcohol from 100 to 157F. A design coefficient UD = 85 was employed, but during initial operation a hot-liquid outlet temperature of 117F was obtained. It' rose during operation at the average rate of 3F per month. What dirt factor should have been specified for a 6-month cleaning cycle?

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Evaluate each of the following, accurate to the nearest cent.

Evaluate the answers accurate to the cent.

Evaluate each of the following, accurate to the nearest cent.