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Available with design pressures of up to 100 barg, Alfa Laval SHEs are designed to meet all your application needs, from dirty fluids to vacuum condensation and reboiling duties. Although Alfa Laval offers standardized versions, many customers request the customized solutions of our SHEs shown on these pages.

Applications

  • Gases: pure vapour and mixtures with inert gases.
  • Vapour/liquid: Top condensers, reflux condensers, vacuum condensers, vent condensers, reboilers with fouling fluids, gas coolers.

 

Benefits

  • Low-pressure drop is ideal for vacuum condensation
  • Reliable operation, maximum uptime
  • Low maintenance costs
  • Compact and easy to install.

The channel with the fluid being condensed or evaporated is usually open at each end so, unlike in  Type 1, the fluid flows across the spiral rather than following the spiral. The liquid on the other circuit, whether heating or cooling, flows along the spiral similar to the Type 1 and this channel is seal welded at each end. Thus, the fluid is completely enclosed and the channel is not accessible for cleaning (therefore the liquid must be clean).

The Type 2 spiral is always cross-flow rather than countercurrent flow. This means that it is thermally less efficient than the Type 1. Generally, there is a very low-pressure drop on the condensing circuit so it is very well suited to vacuum condensation duties. There are many different configurations of Type 2, the two most simple and common are as shown.

Performance data

Temperature: –100°C to 400°C
Design pressure: Full vacuum to 100 barg
Diff. pressure: Up to 80 barg
Heat transfer area (max): 2,500 sqm