Danfoss SONDEX®

Heat Exchangers

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Welded Heat Exchangers

SONDEX® spiral heat exchangers

Our SONDEX® Exceptionally well-suited for sludges, slurries, waste water, fouling, liquids with high viscosity, and liquids that contain fibers and solids, our SONDEX® spiral heat exchangers are the definitive solution for applications that require treatment of challenging fluids. The design allows for a countercurrent flow that makes it possible to achieve very close temperature approaches.

Product description

SONDEX® spiral heat exchangers

Designed and custom made to handle sludges, slurries, waste water, wood pulps, hydrocarbons with high viscosity, and fouling liquids that contain fibers and solids, our SONDEX® spiral heat exchangers are the ultimate solution for even the most challenging, high-viscosity media. Since we use coiled metal sheets instead of tube bundles, we can achieve very high thermal performance without sacrificing the plate gap that lets the media flow unimpeded.

What does that mean for you?

The core of our spiral heat exchangers is the concentric spiral plate coils nested in the shell. The coils form two completely separated channels with a countercurrent flow arrangement that allows the heat exchanger to achieve very close temperature approaches, making our spiral units excellent for heat recovery applications.

To maintain the plate gap, we weld spacer studs onto the coils. Besides supporting the plate gap, the studs also greatly contribute to the turbulent flow. Our Free Flow option for spiral heat exchangers is stud-less, sacrificing some turbulence in exchange for a much larger plate gap for the most challenging media. These options enable us to efficient handle any duty and we offer you a choice of regular or Free Flow channels on both sides, or a combination of the two.

No application or duty is the same for a spiral heat exchanger, which is why we customize every single one of our units from the ground up according to your specifications. We are dedicated to providing you with an individually optimized solution designed for maximal uptime and reliable operation.

Easy maintenance and cleaning

The spiral coil itself also contributes to the turbulent flow, and the single-channel design helps alleviate fouling with a “self-cleaning” mechanism. Accumulated deposits create local increases in velocity, creating a scrubbing effect that is enough to loosen the build-up in fouling in most cases. This allows our SONDEX® spiral heat exchangers to operate in very long sessions without maintenance or cleaning.

Some media, however, are so challenging that the heat exchanger requires more frequent maintenance and cleaning. With this in mind, we have designed hinged covers that are sealed with C-clamps, creating a swing door that is very easy to open and close without any special tools required, letting you access the entire coil for inspection and cleaning.

Features and benefits

  • Single-channel design that generates high shear rates which contribute to a self-cleaning effect, preventing clogging of the unit. Spiral heat exchangers are the perfect solution for challenging, high-viscosity media.
  • The channel size is selected to fit the flow and qualities of the media. The many variations in diameters and widths of the spiral coil allow for many different combinations, which mean that we can create the optimal solution for every duty.
  • Designed to handle a very aggressive temperature program and with a wide range of materials and plate thicknesses available, we customize each spiral heat exchanger to match the requirements of any application.
  • Limited need for maintenance and cleaning ensures extended operational uptime. If the need for cleaning arises due to particularly difficult media, the hinged covers provide easy access to the entire heat transfer surface.
  • Very compact solutions, our spiral heat exchangers have minimal space requirements. Despite their small stature, the long, curved flow paths allow for very high heat transfer coefficients up to twice as high as their shell and tube counterparts.

 

Faq

What kind of heat exchanger is right for me?

The choice of heat exchanger depends on many factors. Our skilled sales engineers design the heat exchanger with the appropriate dimensions and correct specifications based on your input and requirements, to ensure that you receive a quality solution that performs optimally.

Which certificates are available for the heat exchangers?

Please refer to (Name of certificate page) for a complete list of our certificates. (Link to certificate page)

Where can I get a price list?

As each heat exchanger is individually designed, the price will vary according to the specifications. Please contact your local sales responsible or department for a quotation. (Link to contact page)

How can I get a quotation?

Please fill out our inquiry form (Link to inquiry form), contact your local sales office (Link to contact page). To receive a correct quotation you will need the following data:

  • Duty
  • Type of media
  • Pressure drop
  • Flow rate
  • Working pressure
  • Thermodynamic properties
  • Temperature
  • Working temperature

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