Unlike finned tube exchangers, in the round-tube plate-fin heat exchanger [RTPF] the fin is formed directly from a punched tape, cut and positioned one after the other according to a finning step; then, the tubes are interlaced to plates and mechanically expanded leading to maximum heat transfer.
The return U-bends and manifolds are welded according to a precise circuit, which allows the fluids to circulate inside the tubes in an optimal way. All coils are tested for leaks after completion. The materials used are chosen according to the applications: copper, steel or stainless steel for pipes, and copper, aluminum alloy, steel, or stainless steel for fins. The DAV SLIT pack exchangers are particularly recommended in refrigeration applications.
Also heating applications are possible with temperature up to 230 °C depending to selected materials. The high exchange surface of this type of exchangers favors the use of copper or aluminum fins because of their high thermal conductivity.