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March 23, 2026

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Fouling in Heat Exchangers

Comparison diagram of clean heat exchanger versus fouled exchanger showing difference between clean U and dirty U
PPI March 19, 2026 0

Clean U vs Dirty U – How Plants Actually Operate – The Gap Between Design Assumptions and Operating Reality

In heat exchanger design, calculations almost always begin with a clean U. In plant operation, equipment almost always runs with a dirty U. This gap between clean and dirty conditions…

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Recent Posts

  • Why Average Temperature Difference Is Misleading – When a Useful Shortcut Starts Hiding Real Plant Behavior
  • Clean U vs Dirty U – How Plants Actually Operate – The Gap Between Design Assumptions and Operating Reality
  • Why U Is a Result, Not a Design Input – The Root Cause of Many Fragile Heat Exchanger Designs
  • Why U Values from Books Fail in Plants – Because Real Heat Transfer Is Messier Than Any Table Can Capture
  • Temperature Profiles in Equipment – Why Heat Transfer Is Never Uniform Inside Real Process Equipment

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