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

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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 150°F by heating 19,000 lb/hr of butyl alcohol from 100 to 157°F. A design coefficient UD = 85 was employed, but during initial operation a hot-liquid outlet temperature of 117°F was obtained. It' rose during operation at the average rate of 3°F per month. What dirt factor should have been specified for a 6-month cleaning cycle? 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 150°F by heating 19,000 lb/hr of butyl alcohol from 100 to 157°F. A design coefficient UD = 85 was employed, but during initial operation a hot-liquid outlet temperature of 117°F was obtained. It' rose during operation at the average rate of 3°F per month. What dirt factor should have been specified for a 6-month cleaning cycle?

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