Brazed plate heat exchanger, dual-flow LD235-240L-2S-DN80SS (connections: 6 stainless steel flanges) 0255-0430

Application and performance in demanding conditions

This two-pass brazed plate heat exchanger, built using copper brazing technology, is a solution dedicated to installations requiring high thermal power while maintaining compact dimensions. Thanks to the specific shaping of the flow channels, the device achieves a high heat exchange coefficient while maintaining low hydraulic resistance. This is crucial in systems where flow is limited or where rapid heating of large water masses is necessary. It performs particularly well in liquid-to-liquid heating and cooling circuits, operating stably even at flow temperatures reaching 230 °C and under a working pressure of 30 bar.

The "two-pass" design (designation 2S) is not just a change in the connection scheme – it allows for more efficient use of the heat exchange surface in situations where the temperature differences between the primary and secondary media are small or when high efficiency is required under specific operating parameters. This allows the device to handle large thermal loads without the need to use significantly larger and more expensive single-pass models.

Construction, material, and resistance to operating conditions

The entire unit is made of stainless steel, ensuring high corrosion resistance and durability in aggressive chemical environments. The vacuum furnace brazing process guarantees a permanent bond of all plates, eliminating the risk of leakage resulting from mechanical play or seal aging – they simply do not exist here. This structural tightness translates directly into operational safety and the lack of need for regular service or replacement of sealing elements.

The exchanger is equipped with six stainless steel flanges with a nominal diameter of DN 80 on both sides (primary and secondary). Such large connections allow for the transfer of large quantities of medium without an excessive increase in flow velocity, which minimizes the risk of erosion and noise in the installation. It is worth noting that despite the impressive pressure and temperature parameters and high exchange capacity, the device maintains relatively small external dimensions (height 788 mm, width 310 mm), which facilitates its installation in tight boiler rooms or technological cabinets.

Installation and system compatibility

The installation of this model is simple thanks to standard DN80 flange connections and the ability to adapt to existing insulation – the design has been engineered to fit ready-made insulation covers. For the installer, this means fewer additional operations (e.g., manual insulation) and faster commissioning of the installation. The device meets rigorous safety standards, including PED (Pressure Equipment Directive), ASME, and UL, which is essential during the acceptance of industrial or municipal investments.

Several key operational aspects of this device are worth noting:

• High operating temperature up to 230 °C allows for application in heating circuits with very high thermal parameters.
• Pressure resistance of 30 bar guarantees safety even in systems with a large dynamic pressure drop.
• The set of 6 DN80 flanges made of stainless steel simplifies integration with main pipelines without the need for additional reductions or material transitions.
• The two-pass configuration increases heat exchange efficiency where classic single-pass solutions would require a significantly larger plate contact surface.
• The use of stainless steel eliminates the need for additional anti-corrosion protection when in contact with aggressive cooling or heating agents.
• Compact dimensions (788 mm height and 310 mm width) enable installation in areas with limited technical space while simultaneously maintaining high thermal power.

Thanks to this combination of material strength, precise channel geometry, and installationflexibility, this exchanger provides a solid foundation for modern HVACR systems and technological installations requiring reliability over many years of continuous operation.