Summary
The wave-finned flat tube heat exchangers are widely used in air-cooled condensers of a power plant. Due to the oblique arrangement of the wavy fins on the A-frame tube bundles of the air-cooled condenser, the finned tube is prone to fouling thus the thermo-flow performances of air-cooled condensers are likely to become deteriorated. A new configuration of wave-finned flat tube, in which the fin surface rotates to be perpendicular, is proposed in this paper to prevent the fouling from gathering on the finned tube. The physical and mathematical models for the fluid and heat flows of the cooling air through the present and proposed wave-finned flat tube bundles are setup, and the thermoflow characteristics are compared. For the proposed finned tube, the influences of the fin pitch, height and the Reynolds number on the flow and heat transfer performances are investigated, and the correlations of the friction factor and Nusselt number are recommended. The results show that the buoyancy effect should be taken into account for the correlation of the friction factor at low Reynolds numbers, but this buoyancy force can be ignored for the Nusselt number.
Details
- Original title: Thermal-flow characteristics of the new wave-finned flat tube bundles in air-cooled condensers.
- Record ID : 30006241
- Languages: English
- Source: International Journal of thermal Sciences - vol. 53
- Publication date: 2012/03
- DOI: http://dx.doi.org/10.1016/j.ijthermalsci.2011.11.002
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Indexing
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Themes:
Evaporators, condensers and other heat exchangers;
Heat transfer - Keywords: Finned tube; CFD; Heat transfer; Air; Flow; Condenser
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- Date : 2018/07/09
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- Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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- Author(s) : KUMLUTAS D., KARADENIZ Z. H., KURU F.
- Date : 2013/03
- Languages : English
- Source: Applied Thermal Engineering - vol. 51 - n. 1-2
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Compensation of airflow maldistribution in fin-...
- Author(s) : KAERN M. R., TIEDEMANN T.
- Date : 2012/07/16
- Languages : English
- Source: 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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A new generation of ammonia unit coolers.
- Author(s) : FILIPPINI S., MERLO U.
- Date : 2009/05/07
- Languages : English
- Source: 3th Conference on Ammonia Refrigeration Technology. Proceedings: Ohrid, North Macedonia, May 7-9, 2009.
- Formats : PDF
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- Author(s) : FILIPPINI S., MERLO U.
- Date : 2010/06
- Languages : Spanish
- Source: IIF-IIR/Frío Calor Aire acond. - vol. 38 - n. 426
- Formats : PDF
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