Danfoss SONDEX®

Heat Exchangers

Free Flow plates

What does that mean for you?

The deep and wide channels provide ample room for hard-to-handle media to flow effortlessly, ensuring gentle treatment of the output product and leading to sustainable quality improvements.

Since there is only line contact between the plates, even long and sticky particles will not get stuck and clog the heat exchanger.

The Free Flow plates are also well-suited for media that tend to cause fouling, and are designed with the fouling factor in mind. The channels allow for efficient heat transfer and an ideal flow regardless of the accumulated fouling. Because of this, cleaning can be postponed and you achieve longer operational uptime.

This enables a sugar producer, for example, to operate at full capacity throughout an entire campaign without losing valuable production time and product output.


Features and benefits

  • Ensures an unimpeded flow due to the deep channels and limited contact points between the plates. The large plate gap is designed to handle media that cause fouling and clog regular heat exchangers.
  • Extended operational uptime with no cleaning needed, regardless of the media’s viscosity, fouling tendency, and particle contents.
  • Asymmetric patterns are available for applications with big flow rate differences. Taking the flow rate differences into account eliminates problems with air pockets, media maldistribution and low turbulence.

“Our SONDEX® Free Flow pattern is designed to treat media that is unsuitable for regular heat exchangers due to high viscosity, fiber and particle contents, or considerable risk of fouling.

Free Flow plates

How does a SONDEX® plate heat exchanger work?


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?

Our heat exchangers are approved and certified according to industry standards and requirements. For specific details, please reach out to your local SONDEX® brand sales representative.

Where can I get a price list?

Please contact your local SONDEX® brand sales responsible.

How can I get a quotation?

Please contact your local SONDEX® brand sales office. For the most accurate quotation, please prepare the following data:

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


What would you like to know more about? We offer a wide range of informative content relating to our products. You can find general information about our products in brochures, technical specifications on data sheets, and various instructions in operating and maintenance guides.

Want to know more?

Please get in touch with your local contact person for more information and learn how Danfoss can help improve your business. Additionally, please feel free to send us a mail.

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