What are the 4 types of heat exchange?

While classifications vary, the four major types of heat exchangers by construction are Shell and Tube, Plate & Frame, Double Pipe, and Finned Tube (Air Cooled), used for transferring heat between fluids, with different designs suited for different applications like industrial processes, HVAC, or refrigeration.
Here are the common types:
Shell and Tube Heat Exchanger: A robust design with tubes inside a large shell, ideal for high-pressure, high-temperature industrial applications, separating fluids with tubes or plates.
Plate Heat Exchanger (Plate & Frame): Uses thin, corrugated plates to create large surface areas for efficient heat transfer, often found in food processing and HVAC.
Double Pipe Heat Exchanger: A simpler design with one pipe inside another, great for smaller flows and viscous fluids, including variations like hairpin exchangers.
Finned Tube Heat Exchanger (Air Cooled): Features fins attached to tubes to increase surface area for heat exchange with air, common in air conditioners and radiators.
Other important types include Spiral, Regenerative, and specific functional types like Condensers or Evaporators.