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RF™ Radial Flow Gas Heat Exchangers. Compact design.

The radial geometry achieves uniformly distributed gas flow perpendicular to the exchanger tube banks. This results in effective use of all heat transfer surfaces.

Fewer tubes are required thus providing for smaller shell diameters. The RF™ exchanger is also offered in a SF™ Split Flow design. In most cases, RF™ exchangers can be shop fabricated, resulting in better quality control and reduced costs.

Ease of tube bundle fabrication.
Polygonal tube arrangements provide a compact tube bundle design that facilitates tubesheet lay out and fabrication. This reduces shop labour costs and fabrication duration.

Minimal differential thermal stress.
The symmetrical arrangement results in even flow distribution, minimising differential thermal expansion between tubes thus reducing tube and attendant tubesheet stress. The reduction in mechanical stress results in an extended service life.

Lower shell side pressure loss.
For a given gas flowrate, the radial flow layout results in a lower shell side pressure loss in comparison to equivalently sized segmental baffle exchanger designs. Reductions in the shell side pressure loss contributes to savings in blower operating cost and increases in blower capacity.

Freedom of nozzle orientation.
The radial flow layout permits 360 orientation nozzles on both the shell and tube side inlets and outlets. This facilitates the layout of ducting and matching of existing ducting in a retrofit application.

Effective control of tube and tubesheet temperatures.
The SF™ Split Flow option of the RF™ heat exchanger allows effective control of the tube and tubesheet temperature at the cold or hot end of the exchanger. The split flow design provides a small slip stream of hot shell side gas to be directed to the cold end tubes thus minimizing the possibility of condensation. For air preheater exchangers, the split flow radial design provides a small flow of shell side cold gas to cool the hot end of the exchanger thus reducing the thermal stresses in the hot end tube to tubesheet connection which is directly exposed to extremely high furnace gas temperatures.