The Type dimension of Double Pipe Type Internal Heat Exchanger (IHX) segmentation classifies units by flow arrangement and pass configuration. Single‑pass exchangers, wherein the process fluid traverses the inner tube once, dominate low‑capacity niche markets due to their simplicity and reduced pressure drop, contributing roughly 20% of total market revenue. Multi‑pass designs, featuring two or more traversals of the inner conduit, enhance heat transfer efficiency and are favored in medium‑scale operations, accounting for about 30% of sales. Counter‑current configurations, where the shell and tube streams move oppositely, deliver the highest thermal effectiveness and thus capture the largest share—approximately 35%—driven by demand in high‑temperature, high‑pressure sectors. Finally, Co‑current exchangers, with parallel flow directions, serve specialized processes requiring uniform temperature profiles, representing the remaining 15% of the market. Each subtype’s share reflects its alignment with process intensity, capital investment thresholds, and performance criteria across end‑users.