Which heat exchanger uses tubes that are composed of two sections pressed together to form a hollow flat tube?

• A. Harrison Strut-Type
• B. Shell and Tube
• C. Plate Type
• D. Tubular Twin-Type

Answer: (A)

The main idea here is recognizing how the tubes are made in different heat exchanger designs. The description—tubes formed by pressing two sections together to create a hollow flat tube—is a hallmark feature of the Harrison Strut-Type heat exchanger. In this design, two sheet-metal pieces are pressed and joined to form a single hollow, flat-tube channel, which is then arranged in a strut-like bundle to provide structural support and a compact heat-transfer area.

This is distinct from other common types: shell and tube use round tubes; plate-type relies on flat plates forming flow passages rather than hollow tubes; and tubular twin-type involves tubular elements that aren’t built from two pressed halves to form a flat channel. So the two-halves-pressed-to-a-flat-tube construction best identifies the Harrison Strut-Type.