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TECHNICAL PAPERS: Gas Turbines: Heat Transfer

Effects of Pore Size Variations on Regenerative Wheel Performance

[+] Author and Article Information
Wei Shang, Robert W. Besant

Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon SK S7N 5A9, Canada

J. Eng. Gas Turbines Power 127(1), 121-135 (Feb 09, 2005) (15 pages) doi:10.1115/1.1804539 History: Received April 02, 2003; Revised September 01, 2003; Online February 09, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic of airflow for air-to-air heat/energy exchangers
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(a) A typical energy wheel with desiccant coating, (b) corrugated channels for the same energy wheel with flow through each pore
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Number of wheel matrix pores versus pore hydraulic diameter for a Guassian distribution of diameters
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Pressure drop ratio for parallel surface wheel with random variations in pore sizes to one without versus the standard deviation in pore hydraulic diameters with respect to the mean value
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Effectiveness versus mass flow rate under the ARI Std 1060 test conditions based on the correlations of Simonson and Besant (see Ref. 17) for a desiccant coated energy wheel for ventilation air heat and moisture exchange (wheel width 229.5 mm, wheel diameter 638.5 mm, wheel rotational speed 27.6 rpm, and silica gel desiccant coating)
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Ratio of effectiveness for a parallel surface wheel with a random variation in pore sizes to one without versus standard deviation in pore hydraulic diameters with respect to the mean value
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Pressure drop ratio for a regenerative wheel with a matrix containing symmetrical cylinder pores with random variations in pore sizes to one without versus the standard deviation in pore hydraulic diameters with respect to the mean value
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Ratio of effectiveness for a regenerative wheel with a matrix containing symmetrical cylinder pores with a random variation in pore sizes to one without versus standard deviation in pore hydraulic diameters with respect to the mean value
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Schematic of a corrugated shaped matrix channel for a regenerative wheel
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Kf versus aspect ratio η for a corrugated channel
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Kp versus aspect ratio η for a corrugated channel
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K versus Δη/η0 for a corrugated pore geometry with η0 as a parameter
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D/2a versus aspect ratio η for a corrugated channel
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Modified pressure drop ratio for a corrugated matrix energy wheel versus standard deviation divided by mean value of hydraulic diameter
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Modified effectiveness ratio for a corrugated matrix energy wheel versus standard deviation divided by mean value of hydraulic diameter
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Modified effectiveness ratio for a corrugated matrix energy wheel versus standard deviation divided by mean value of hydraulic diameter ∂εm=−0.3
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A schematic of the optical system used to measure pore geometries
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Photos of the matrices for four different energy wheels
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A schematic diagram showing the optical measure position Pij on an energy wheel face
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A chi squared analysis of the characteristic dimension distributions of the four wheels; (a) parallel surface wheel (D/2), (b) hexagonal honeycomb wheel (D), (c) corrugated aluminum wheel (2b), and (d) corrugated paper wheel (2b) each compared with a Gaussian distribution line

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