Tubes or Plates

Tubes or plates in heat exchanger cores are engineered components that form the primary heat transfer surface, enabling thermal energy exchange between two or more fluid streams without mixing. Tubes are typically cylindrical conduits arranged in bundles, while plates are flat or corrugated sheets stacked with gaskets or welded. They maximize surface area for heat transfer while maintaining structural integrity under pressure, temperature, and corrosion conditions. Design variations include shell-and-tube, plate-and-frame, and plate-fin configurations, optimized for specific industrial applications like HVAC, chemical processing, or power generation.

Heat transfer occurs through conduction across the tube or plate wall, with fluids flowing on either side (e.g., hot fluid inside tubes, cold fluid outside). In tubes, heat flows radially through the tube wall; in plates, it flows through the thin plate material. Enhanced surfaces (e.g., fins, turbulators) increase turbulence and surface area, improving convective heat transfer coefficients. The principle relies on temperature gradients driving energy from hotter to cooler fluids, with efficiency dependent on material thermal conductivity, flow arrangement (counter-current, parallel), and cleanliness.