Solutions
Which heat exchanger technology for your duty?
Nexson Group builds eight heat exchanger technologies. Together they span −253 °C to 1,000 °C, from full vacuum to 1,400 bar, and 1 m² to 25,000 m² of heat transfer surface but no single one covers all of it.
One constraint decides, and the rest is sized around it: particle size, viscosity, pressure, temperature, phase change or corrosion. The table below starts from each of them.
At a glance
| If your duty involves… | Model | Operating envelope |
|---|---|---|
| Spiral plate — GREENSPIRAL™ | ||
| liquid-to-liquid fouling duties, particles up to 14 mm | Type 1 L/L | −100 °C to 450 °C, full vacuum to 25 bar. 1 m² to 700 m². Approach down to 3 °C. Up to 3× more thermally efficient than a shell-and-tube; one unit can replace three. |
| the same duties, at high pressure, particles up to 14 mm | Type 1 HP | −100 °C to 500 °C, full vacuum to 100 bar. 1 m² to 700 m². Approach down to 3 °C. Oil & gas, refining, chemicals. |
| sludge and biosolids, free-flow channels, particles up to 14 mm | Type 1 BB / BW | Up to 150 °C and 8 bar. 1 m² to 100 m². BB: free flow both sides, two independently openable channels. BW: free flow on the biosolids side, one channel opens without dismantling the pipework. |
| condensing, evaporation, near-vacuum service, particles up to 14 mm | Type 2 | −100 °C to 450 °C, full vacuum to 25 bar. 1 m² to 700 m². Pressure drop down to 0.015 psi (0.1 kPa). Mountable directly on a distillation column. |
| large condensing duties, particles up to 14 mm | Type 2 Column | −100 °C to 450 °C, full vacuum to 25 bar. 1 m² to 3,000 m². Several spiral exchangers welded in series inside one shell. |
| steam heating of a fouling or viscous medium, particles up to 14 mm | Type 3 | −100 °C to 450 °C, full vacuum to 25 bar. 1 m² to 700 m². Approach down to 3 °C. Steam crossflow in a fully open channel; inert gases easily removed. |
| Tube - GREENTUBE™ | ||
| wastewater and biosolids, particles up to 30 mm on both sides | RT – rectangular tube | Up to 150 °C and 8 bar. Up to 60 m² per module, in series or parallel. Pressure drop below 1 bar. Fully welded, openable version available. |
| high viscosity, up to 1,000 cP | TT - tube-in-tube | −20 °C to 200 °C. Above 50 bar depending on configuration. Modules up to 6 m. Pressure drop below 1 bar. Inner tubes cleaned without full disassembly. |
| very large duty, cryogenic service, or several fluids in one unit | CW - coil wound | −250 °C to 650 °C. Up to 300 bar shell side, 1,400 bar tube side. Up to 25,000 m² in a single shell, against roughly 3,000 m² for a shell-and-tube. Up to 8 media simultaneously, 6× the transfer coefficient, one tenth of the footprint, approach below 5 °C. |
| Welded plate - GREENBOX™ | ||
| clean media, compact footprint, close approach | Type S | −46 °C to 400 °C, full vacuum to 50 bar. 2 m² to 400 m². Designed to API 662. Patented corner design, removable side panels, interchangeable core. |
| clean media at very high pressure and temperature, thermal shock | Type W | −200 °C to 400 °C, full vacuum to 130 bar. 1 m² to 500 m². Circular shell, multi-channel with adjustable baffles. |
| Plate & shell - GREEN P&S | ||
| corrosive or high-pressure duty, with mechanical cleaning access | Type O - openable | −196 °C to 500 °C, full vacuum to 120 bar. 2 m² to 2,000 m². DN25 to DN300. Plate pack removable from the shell. |
| corrosive or high-pressure duty, fully welded, no gaskets | Type W - welded | −196 °C to 500 °C, full vacuum to 150 bar. 2 m² to 2,000 m². DN25 to DN300. Plate pack and shell welded but independent, allowing free expansion. |
| flooded evaporation, ammonia refrigeration, heat pumps, ORC | Type K - kettle | −196 °C to 500 °C, full vacuum to 120 bar. 2 m² to 2,000 m². Three-stage separation, expansion zone, dynamic stage, demister, against liquid carry-over to compressors. |
| Printed circuit - PCHE | extreme pressure or temperature, hydrogen, supercritical CO₂, minimal footprint | PCHE | −253 °C to 1,000 °C, up to 1,000 bar. Diffusion-bonded, no gaskets and no welds. Channels 0.1 to 2 mm, surface density up to 6,000 m²/m³, 85 to 90 % smaller and lighter than a shell-and-tube for the same duty. |
| Gasketed, semi-welded and double wall plate - thermoline™ of thermowave | ||
| standard HVAC and process duties | ECO | Gasketed and double wall. Full vacuum to 16 bar. Plate pack reconfigurable to change the thermal programme. |
| cooling of food, process fluids, premises and buildings | VARIO | Gasketed, semi-welded and double wall. Full vacuum to up to 30 bar depending on frame. Capacity adjusted by adding or removing plates. |
| food and beverage, pasteurisation | PURE | Gasketed, semi-welded and double wall. Full vacuum to 22–25 bar depending on frame. Heat recovery up to 96 %. Food-contact materials, aseptic and dairy connections. |
| industrial refrigeration with natural refrigerants CO₂ and NH₃, in cascade | PLUS | Gasketed, semi-welded and double wall, laser-welded modules. Up to 63 bar module side. Cleaning possible at 50 bar. Six frame types. |

