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April 11, 2026

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Heat Exchanger Performance

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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Illustration showing temperature gradients in heat exchangers, pipelines, and vessels across length and wall thickness
PPI March 15, 2026 0

Temperature Profiles in Equipment – Why Heat Transfer Is Never Uniform Inside Real Process Equipment

In process plants, temperature is often treated as a single value: inlet temperature, outlet temperature, or operating temperature. In reality, temperature varies continuously inside equipment. Heat transfer does not occur…

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why convection controls most equipment in process plants
PPI March 1, 2026 0

Why Convection Controls Most Equipment – The Hidden Limitation Behind Everyday Plant Performance

In process plants, most equipment is designed with sufficient surface area, adequate materials, and appropriate utilities. Yet performance still varies widely with operating conditions. The reason is not usually a…

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what controls overall heat transfer coefficient in heat exchangers
PPI February 12, 2026 0

What Really Controls Heat Transfer Coefficient in Exchangers – Why U Is Not a Value You “Pick” But a Value the Plant Creates

Series Context: This article is part of the Heat Transfer in Process Plantsseries, which explains how overall heat transfer performance is governed inreal process exchangers. It builds directly on the…

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Recent Posts

  • Entropy Explained Using Real Process Equipment – Understanding a Difficult Concept Through What Happens in Plants Every Day
  • Why Insulation Never Stops Heat Loss Completely – The Common Expectation vs the Physical Reality
  • Equilibrium vs Steady State – Common Plant Misunderstanding – Two Words That Sound Similar but Mean Very Different Things
  • Why Increasing Area Often Beats Improving U – The Most Reliable Way to Make Heat Exchangers Work in Real Plants
  • Why Heat Transfer Knowledge Separates Operators from Engineers – The Difference Is Not the Job Title — It Is How Problems Are Seen

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