Since 1940, Rigidized® Metals Corporation has been the leader of producing engineered metal surfaces and panels. The metal texturing process adds strength, durability and beauty to any project.

Beth Neel

Experimental Comparison of the Evaporation and Condensation Heat Transfer Coefficients on the Outside of Enhanced Surface Tubes with Different Outer Diameters

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Publication date
2019/10/30
Journal
Chemical Engineering Transactions
Volume 76
Description
An experimental investigation was performed, and results are presented here for an evaporation and condensation heat transfer study that took place using enhanced heat transfer (1EHT) tubes of different outside diameters. Results were compared to the performance of a smooth surface copper tube. The equivalent outer diameter of the horizontal copper tubes considered were 12.7 mm (0.5 in) and 19.05 mm (0.75 in). The test apparatus included a straight horizontal test section with an active length heated by water. Constant heat flux was maintained and refrigerant quality varied.
Beth Neel

Condensation Heat Transfer in Horizontal Three Dimensional Two-Layer Two-Side Enhanced Tubes

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Condensation heat transfer characteristics of near-azeotropic refrigerant R410A inside the horizontal copper and stainless steel EHT series tubes were measured. All three dimensional two-layer two-side enhanced tubes have deep-textured surface structures.  Tests were conducted at an average saturation temperature of 45 °C; over a mass flux range of 100–450 kg/(m2·s); with an inlet quality of 0.8 and outlet quality of 0.2. Condensation heat transfer coefficient of the copper 1EHT tube is about 39–47% higher than that of a stainless steel one, showing a beneficial effect of high thermal conductivity material.

 

Full article can be found here: https://www.sciencedirect.com/science/article/abs/pii/S0017931018314996?via%3Dihub

Beth Neel

Condensation and Evaporation Characteristics of Flows Inside Vipertex® 1EHT and 4EHT Small Diameter Enhanced Heat Transfer Tubes

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Presented at Chemical Engineering Transactions (CET); Vol 70, pg 13

 

https://doi.org/10.3303/CET1870003

 

 

Results are presented here from an experimental investigation on tubeside condensation and evaporation heat transfer that took place in three Vipertex® stainless steel enhanced heat transfer tubes (1EHT-2, 2EHT-2 and 4EHT). Equivalent outer diameter of the tube was 9.52 mm (0.375 in) and the inner diameter was 8.32 mm (0.3276 in).

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