Tag: FINNED TUBES

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CS-24 Shellside Mixture Condensation on Low-finned Tubes in Vacuum Conditions

January 24, 2024

This report describes an assessment of the accuracy of HTRI predictions of mixture condensation on low-finned tubes under vacuum conditions. Tests were conducted on a 19.05-mm OD low-finned tube bundle in the Low Pressure Condensation Unit (LPCU) over a range of vacuum pressures (5.75– 93.7 kPa) and inlet vapor Reynolds numbers...
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• VACUUM
• SHELLSIDE
• FINNED TUBES
• CONDENSATION

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AC-19 Mixed Convection Heat Transfer Outside High-finned Tube Bundles in Low Airflow

June 23, 2022

Modeling natural-draft air coolers requires accurate prediction of airside heat transfer coefficients at low airflow rates. HTRI has collected additional data from the Air-cooled Unit (ACU) to develop a correlation for mixed convection that predicts low airflow heat transfer. The improved correlation, based on Rayleigh and Reynolds numbers, results in an...
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• FINNED TUBES
• CONVECTION
• AIR COOLED

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TT-15 Condensing heat transfer across inline low-finned tube bundles in cross flow

January 26, 2017

Component: Xace, Xist Date posted: 22 May 2012 Last updated: 7 August 2024 Externally finned tube bundles can be specified for condensing applications where the outside heat transfer coefficient is less than the inside coefficient and where the shellside thermal resistance dominates. Although condensing applications with inline low-finned tubes are rare,...
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• CROSSFLOW
• FINNED TUBES
• SINGLE-PHASE

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PFE-3 Prandtl Number Effect on Offset-strip Plate Fin via CFD

January 16, 2017

Using CFD simulations of laminar flow in an offset-strip fin geometry validated with experimental data, we have confirmed that the Colburn j-factor can be substantially overpredicted for fluids whose Prandtl number is significantly greater than that of air. In addition, we determined that the j-factor varies inversely with a Prandtl number...
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• FINNED TUBES
• CFD

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Research Update: Crossflow Mixed Convection Heat Transfer for Horizontal Tube Banks

January 16, 2017

This webinar reviews measurement of mixed convection heat transfer using liquids in crossflow over ideal horizontal plain and low-finned tube banks. We identify when natural convection may enhance or penalize crossflow heat transfer and recommend new calculations to improve HTRI software predictions....
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• CONVECTION
• CROSSFLOW
• FINNED TUBES
• RESEARCH

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Research Update: Applications of Crossflow Boiling Model to Low-finned Tube Bundles

January 16, 2017

This webinar reviews HTRI and literature boiling data outside low-finned tubes, compares HTRI flow boiling data across plan and low-finned tube bundles, examines and evaluates HTRI’s current boiling model, and describe a more simple and more accurate boiling model....
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• BOILING
• CROSSFLOW
• FINNED TUBES
• RESEARCH

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Is My Design OK? Selecting Finned-Tube Bundles

January 16, 2017

Are you using Xchanger Suite® to model finned-tube bundles? This webinar provides an overview of finned tubes and the various types of finned tubes that Xchanger Suite models. In addition to guidance on when to select each type, the session highlights important, high-level mechanical design aspects of finned tubes....
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• DESIGN
• FINNED TUBES
• XACE
• XIST

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Research Update: Single-Phase Crossflow Methods

January 16, 2017

HTRI continues to improve its single-phase crossflow methods. We have completed a thorough review of heat transfer and pressure drop correlations for single-phase flow outside banks of plain- and low-finned tubes. This webinar highlights some of our findings and summarizes the performance of the improvements we are proposing for our correlations....
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• CROSSFLOW
• FINNED TUBES
• PLAIN TUBE
• PRESSURE DROP
• RESEARCH
• SINGLE-PHASE

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AC-14 Longitudinal Pitch Effect on Pressure Drop and Heat Transfer in High-Finned Tubes

January 16, 2017

When increasing longitudinal pitch, methods for both pressure drop and heat transfer predictions for inline and staggered high-finned tube bundles are evaluated. When we compare the behavior simulated through computational fluid dynamics (CFD) to results from Xace and ESCOA for a characteristic tube geometry, the CFD results show that the effect...
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• FINNED TUBES
• CFD

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