In this study, a heat transfer and pressure drop correlation are determined for helically I- and U-shaped finned tubes as well as for solid I-finned tubes at constant transverse and longitudinal spacing. In the heat transfer correlation, the influence of the number of tube rows arranged in flow direction is taken into consideration. A detailed description of the test rig and the data reduction procedure is presented. A thorough uncertainty analysis was performed to validate the results. The investigation has shown that the influence of the fin geometry on the heat transfer of the helically segmented I- and U-shaped tubes can be disregarded. The heat transfer correlation, which is valid for the helically segmented I- and U-shaped tubes in a staggered arrangement, can describe 90% of all measurement data within ±15%. All measurements are performed for constant transverse and longitudinal spacing. For the pressure drop coefficient, two new correlations, which are only valid for helically segmented U shaped finned tubes in a staggered arrangement, show an average deviation of approximately ±13% for 90% of all measurement results. All new correlations are compared with correlations from open and established literature for industrial boiler applications. The new heat transfer and pressure drop correlations show a relative deviation of ±20% in comparison with correlations in open literature. The new pressure drop correlations show the same characteristic as most correlations in the open literature.
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December 2012
Research-Article
Experimental and Numerical Investigation of the Gas Side Heat Transfer and Pressure Drop of Finned Tubes—Part I: Experimental Analysis
Heimo Walter
Heimo Walter
Mem. ASME
Vienna University of Technology,
e-mail: heimo.walter@tuwien.ac.at
Institute for Energy Systems and Thermodynamics
,Vienna University of Technology,
Getreidemarkt 9, A-1060 Vienna
, Austria
e-mail: heimo.walter@tuwien.ac.at
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Rene Hofmann
Heimo Walter
Mem. ASME
Vienna University of Technology,
e-mail: heimo.walter@tuwien.ac.at
Institute for Energy Systems and Thermodynamics
,Vienna University of Technology,
Getreidemarkt 9, A-1060 Vienna
, Austria
e-mail: heimo.walter@tuwien.ac.at
Manuscript received February 27, 2012; final manuscript received June 16, 2012; published online October 17, 2012. Assoc. Editor: Larry Swanson.
J. Thermal Sci. Eng. Appl. Dec 2012, 4(4): 041007 (11 pages)
Published Online: October 17, 2012
Article history
Received:
February 27, 2012
Revision Received:
June 16, 2012
Citation
Hofmann, R., and Walter, H. (October 17, 2012). "Experimental and Numerical Investigation of the Gas Side Heat Transfer and Pressure Drop of Finned Tubes—Part I: Experimental Analysis." ASME. J. Thermal Sci. Eng. Appl. December 2012; 4(4): 041007. https://doi.org/10.1115/1.4007124
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