Headers

Headers are critical components in heating and cooling coil assemblies that serve as fluid distribution manifolds. They connect to the main supply and return lines, then branch out to multiple parallel tubes within the coil. Headers ensure uniform flow distribution across all tubes, preventing maldistribution that could reduce heat transfer efficiency. They are typically cylindrical or rectangular chambers with multiple outlet ports precisely aligned with coil tube ends.

Headers operate on fluid distribution principles where pressurized fluid enters through a single inlet, then divides evenly into multiple parallel flow paths through outlet ports. The header's internal geometry and port sizing create balanced pressure drops to ensure equal flow distribution to all coil tubes. This uniform distribution maximizes heat transfer surface utilization and prevents localized hot/cold spots.