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Tag Archive for: Vipertex

Beth Neel

Vipertex® Presentation at Heat Exchanger World 2024

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Rigidized® Metals’ Vipertex® team exhibited, as well as gave a presentation, at Heat Exchanger World, held in Houston, Texas, October 16-17. The presentation: Increasing Energy Production Using Enhanced Surfaced Hydrophobic Tubes for Condensation Heat Transfer Applications is available for download, here.

Increasing energy use and the production of greenhouse gases (as the result of using many sources of energy) has created environmental problems that must be addressed in present and future designs.  Carbon neutrality is an important goal when considering energy use; countries are exploring ways to optimize energy use and minimize carbon use.   Enhancing heat transfer and increasing the efficiency of heat exchangers are essential in trying to achieve carbon neutral designs.

Condensing heat exchangers are widely used in various process engineering applications and the methods to improve energy efficiency are an objective in most designs. Typically the most effective way to enhance condensation is to thin the liquid film.  In order to enhance droplet condensation, the use of hydrophobic structures is an important method to consider when wanting to enhance droplet condensation designs; this is accomplished by producing a low free energy surface- this is accomplished by using micro- and nanostructured surfaces.

Experimental results of condensation heat transfer enhancement using hydrophobic stainless steel tubes are presented.

Beth Neel

Welded Carbon Steel Tubes for Energy Efficiency

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A new ASTM International standard covers welded carbon steel tubes that will help to enhance the efficiency of heat transfer in industrial plants and heating vacuum and air-conditioning (HVAC) systems. Rigidized® Metals’ Vipertex® enhanced heat transfer tubes are produced according to this standard. Learn more, below:

https://sn.astm.org/?q=update/welded-carbon-steel-tubes-energy-efficiency-jf22.html

 

Learn about our Vipertex® enhanced heat transfer tubes, here.

Beth Neel

Two-Phase Heat Transfer of R410A in Annuli Outside Enhanced Tubes With Micro-Fin and Dimple

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An experimental study of two-phase heat transfer using R410A in the annuli outside tube-in-tube heat exchanger was performed using several enhanced tubes; performance was compared to the performance of a smooth tube. Condensation experiments (using R410A) were conducted at a saturated temperature of 45 °C. Mass flux ranged from 75 to 225 kg m-2 s-1; with inlet vapor quality of 0.8 and outlet quality of 0.2. Evaporation experiments were conducted at saturated temperature of 6 °C using R410A; with a mass flux ranging from 75 to 225 kg m-2 s-1; inlet vapor quality of 0.2 and outlet quality of 0.8. The heat transfer coefficients of condensation and evaporation outside the smooth tube were compared with the existing correlations. The major conclusions are summarized as follows:

  1. Evaporation heat transfer characteristics of the enhanced tubes tested show that as mass velocity increases, the heat transfer coefficients also increase; the EHT HB-D tube produces the best thermal performance; its heat transfer coefficients are 1.54 to 2.23 times higher than that of the smooth tube.
  2. In a comparison of condensation heat transfer performance of the HB tube to the DIM/HB tube lower performance is observed in the DIM/HB tube at low mass flux rates; as the mass flux is increased, the dimple structure gradually changes from obstructing heat transfer to enhancing heat transfer. As the mass flow rate increases, the disturbance caused by the dimple structure circulates the retained refrigerant and enhances the heat transfer.  The EHT HB-D tube has the best heat transfer performance (especially at high mass flow rates).

The complete publication can be found, here.

Tag Archive for: Vipertex

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