Seven specification mistakes in heat exchanger projects
Most heat exchanger issues don’ t originate in fabrication or installation, but in the early decisions that define the project. This article explores how small gaps in specification can cascade into major technical, financial, and operational risks, and how a more structured approach can prevent them.
By Musa Smakaj, CEO, ZILEX GmbH, and Prof. Dr. rer. nat. Mads Kyed, Flensburg University of Applied Sciences
Heat exchanger projects rarely go wrong on the shop floor. The problems almost always start much earlier – in the specification. Vague details, unstated assumptions, and conflicting data create ripple effects: vendors ask endless clarifying questions, designs get padded with unnecessary margins, bids become impossible to compare, and commissioning throws up expensive surprises. Heat exchangers feel familiar, so teams often treat them like standard parts. But they’ re not. Every installation is shaped by its specific process conditions, mechanical constraints, and operating environment – and a weak specification fails to capture any of that. This article looks at the problem from two angles: a practitioner’ s view from industry( CEO perspective) and an analytical view from engineering research( professor perspective). Both reach the same conclusion: getting the specification right isn’ t paperwork – it’ s one of the most effective ways to control cost, schedule, and risk on a project.
Why specification problems are so costly CEO perspective: The problem usually isn’ t that engineers make careless mistakes. It’ s that heat exchangers get treated as commodity items when they’ re anything but. Time pressure, unclear ownership, and fragmented teams mean that assumptions go unstated and gaps go unnoticed – until they surface later as cost overruns, schedule delays, or performance shortfalls. Professor perspective: Heat exchanger design is more complex than it looks. Thermal and hydraulic behaviour are closely linked, and the calculations involve nonlinear equations built on empirical correlations that only hold within specific ranges. On top of that, finding a good design usually means evaluating many combinations of geometry and operating parameters – which makes both
16 Heat Exchanger World May 2026 www. heat-exchanger-world. com