Tube Bundles Of Shell Tube Heat Exchanger

A tube bundle is the core heat transfer component of a shell-and-tube heat exchanger-the most widely used heat transfer device in industries like oil and gas, power generation, chemical processing, refrigeration, and HVAC. It consists of a set of parallel tubes (the primary heat transfer surfaces) arranged in a pattern, supported by baffles, and fixed to tube sheets.

The tube bundle enables heat exchange between two separate fluids (no direct mixing):

Tube-side fluid: Flows inside the tubes (e.g., cooling water, refrigerant).
Shell-side fluid: Flows outside the tubes (e.g., hot oil, steam, process fluid).

Heat transfers through the tube walls:

Hot fluid releases heat to the tube wall (convection + conduction).
Heat conducts through the tube wall (depends on tube material thickness).
Heat transfers from the tube wall to the cold fluid (convection).

Baffles play a critical role here: they force the shell-side fluid to flow perpendicularly or diagonally across the tubes (instead of parallel), which disrupts boundary layers and significantly boosts heat transfer efficiency (vs. parallel flow).