Vipertex® enhanced surfaces, either in a tube or flat rolled configuration, can be used in a variety of applications. These engineered surfaces are rolled into coils of metal, promoting repeatability, volume production and cost efficiency.

Vipertex® makes it possible to incorporate enhanced surfaces into heat exchanger designs with greater flexibility and scalability, helping you optimize a solution for your project.

Whether you are retrofitting an existing installation or building new, let us help you determine the economic value of using Vipertex®. To begin a conversation with the Vipertex® team, click here.

Operating Conditions

Heat exchangers using Vipertex® tubes and/or flat goods can be substantially more efficient than those produced with conventional materials. Various operating conditions need to be considered so that the appropriateness of Vipertex® can be determined and optional strategies can be considered before making final design decisions. An example of an optional strategy is the fact that the Vipertex® heat transfer efficiency curve is not linear. In the case of the Vipertex® 1EHT, the same heat transfer can be achieved at a much lower flow rate, which can inform optimization decisions about pumping power, size of the overall unit, footage and diameter of tubing required, etc. It may be helpful to read Evaluation of Heat Exchanger Designs Using Enhanced Heat Transfer Tubes, which was presented at the 2017 American Society of Thermal and Fluids Engineers (ASTFE) Conference and 4th International Workshop on Heat Transfer (IWHT).

The complexity of real world installations suggests that a conversation take place early in the design process with the Vipertex® team to evaluate the applicability of Vipertex® tubing and flat sheets in a given design for a heat exchanger installation or manufactured product. More can be learned by reading Comparison of Heat Exchanger Designs Using Vipertex® 1EHT Enhanced Heat Transfer Tubes, presented at the 22nd International Congress of Chemical and Process Engineering CHISA 2016 and the 19th Conference on Process Integration, Modeling and Optimisation for Energy Saving and Pollution Reduction PRES 2016.

HTRI® members can take advantage of a calculation tool that plugs into HTRI® Xchanger Suite software to help them optimize installations using Vipertex® tubing.

Operating Condition Parameters

While an early conversation with the Vipertex® team is clearly the best route, the following topics are covered in order to provide a degree of insight into the potential for Vipertex® in the context of various operating condition parameters.


Pressure Applications

Vipertex® tubes can be applied to exchangers operating at various pressure levels. Different alloy systems, wall thicknesses and processing specifications contribute to the achievement of various pressure ratings.

Burst and collapse tests of welded Vipertex® tubes confirm higher ratings than their smooth, welded tube counterparts. It is apparent that the enhanced surface pattern serves to create a stronger, more rigid tube.

To begin a conversation with the Vipertex® team about your application, click here.

The intersection of lines A and B shows the maximum heat transfer for the Vipertex® enhanced 1EHT tube. In order to obtain the same amount of heat transfer at the point of maximum heat transfer in the 1EHT tube (shown by the intersection of lines A and C), it would require roughly twenty times the flow in a smooth tube. At higher flow rates, there is a 90-100% increase in heat transfer.

Flow Rate

Vipertex® optimal performances produce a more than 500% improvement at Reynolds numbers at 1000. At other flow rates, performance enhancement values of 90-100% are seen. It is very interesting to note that there is an opportunity to reduce flow rate in your design to take advantage of this high-efficiency at the lower rate to reduce pumping power. For instance, you may be able to provide less pumping power to accomplish the same result.

For more information, read Geometric Optimization for Thermal-hydraulic Performance of Dimpled Enhanced Tubes for Single Phase Flow, a paper published in Applied Thermal Engineering, detailing the results of Vipertex® 1EHT tubes.

To begin a conversation with the Vipertex® team about your application, click here.

Two Phase Applications

Vipertex® tubes work extraordinarily well in single phase processes, but also enhance two phase applications. For more information, read Geometric Optimization for Thermal-hydraulic Performance of Dimpled Enhanced Tubes for Single Phase Flow, a paper published in Applied Thermal Engineering, detailing the results of Vipertex® 1EHT tubes.

Vipertex® is available in various surface texture options that may, based on other operating conditions, be more appropriate for particular functions, such as evaporators or condensers. More information can be obtained by reading Condensation and Evaporation Characteristics of Flows Inside Three Dimensional Vipertex® Enhanced Heat Transfer Tubes.

To begin a conversation with the Vipertex® team about your application, click here.

Fouling

Vipertex® enhanced surfaces have heat transfer anti-fouling characteristics for many conditions. Studies have been performed in crude, and once through water. Results show the design of the Vipertex® surface produces a wall shear that cleans the tube surface, allowing less debris to form on the surface. For many applications involving fouling, Vipertex® designs produce more heat transfer and less fouling than other tubes (smooth and other enhanced tubes). In a recent crude oil fouling evaluation, it was shown that a heat duty increase (when compared to other tubes) of up to 19% was achieved when using Vipertex® tubes. Additionally results have shown that in order to achieve the same heat duties, a flow rate reduction of up to 30% could be utilized. More can be learned by reading the following papers:

  • Fouling Results of Vipertex® 1EHT Tubes in Crude, presented at HTRI Global Conference 2017.
  • Heat Transfer Performance Evaluation Criteria Applied to a Textured Tube Surface for Crude Oil
  • Development and Evaluation of Vipertex® Enhanced Heat Transfer Tubes For Use In Fouling Conditions

  • It is important to consider what substances come in contact with the enhanced surfaces in your heat exchanger. As the leader in metal surface engineering, Rigidized® Metals has other surface designs like hydrophobic stainless steel and titanium finishes that may further enhance the anti-fouling performance of Vipertex® tubes in certain applications.

    The Vipertex® team is at your disposal to help you determine the best solution for your application. Click here to begin a conversation.

    Charging Substance

    Since Vipertex® tubes are produced in a variety of alloy systems, optimization is possible to accommodate a wide variety of charging substances. It is important to consider what substances come in contact with the enhanced surfaces in your heat exchanger. This is helpful in determining a suitable alloy, as well as a suitable enhanced heat transfer pattern.

    The increased thermal efficiency of a Vipertex® installation can reduce the amount of charging substance required, which provides the following benefits:

  • Less cost to charge
  • Less environmental liability in the case of a spill
  • Less cost in maintaining a supply of substances that decay through use
  • Reduced space required

  • To begin a conversation with the Vipertex® team about your application, click here.

    Temperature Range

    Vipertex® enhanced surfaces can be produced in a number of alloy systems that can be optimized for operating temperatures ranging from high temperature to cryogenic, allowing the use of Vipertex® products in a wide variety of conditions.

    To begin a conversation with the Vipertex® team about your application, click here.