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Research Papers

Effect of Regeneration Section Angle on the Performance of a Rotary Desiccant Wheel

[+] Author and Article Information
Selvaraji Muthu

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: muthu.selji@gmail.com

Prabal Talukdar

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: prabal@mech.iitd.ac.in

Sanjeev Jain

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
New Delhi 110016, India
e-mail: sanjeevj@iitd.ac.in

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 30, 2014; final manuscript received June 10, 2015; published online November 11, 2015. Assoc. Editor: P. K. Das.

J. Thermal Sci. Eng. Appl 8(1), 011013 (Nov 11, 2015) (9 pages) Paper No: TSEA-14-1107; doi: 10.1115/1.4030966 History: Received April 30, 2014

In this work, the governing equations of coupled heat and mass transfer are developed based on the conservation of energy and moisture in air and desiccant layer of a rotary desiccant wheel in order to consider both the solid-side resistance (SSR) and gas-side resistance (GSR). The simulations are done for composite desiccant and conventional silica gel. The properties of air and desiccant are taken as function of temperature in the adsorption and regeneration sections. The governing partial differential equations are discretized using the finite-volume method with fully implicit scheme and the resulting system of algebraic equations is solved using the Gauss–Seidel method. The model is validated for the moisture removal capacity and relative moisture removal efficiency by comparing the present results with the literature data. The parametric simulations are performed by varying one parameter at a time with the angle of regeneration section kept in a range from 60 deg to 300 deg. The selection of regeneration section angle and temperature of regeneration air is discussed for operating the rotary desiccant wheel at its optimum performance for the range of operating conditions.

Copyright © 2016 by ASME
Topics: Temperature , Wheels , Heat
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References

Figures

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Fig. 2

Schematic of honeycomb channel

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Fig. 1

Schematic of a desiccant wheel

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Fig. 3

Schematic of channels in radial and angular directions

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Fig. 4

Control volume size independency check

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Fig. 5

Time-step independency check

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Fig. 6

Rotary desiccant wheel simulation results comparison with Narayanan and experimental results for the conventional silica gel desiccant

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Fig. 7

Rotary desiccant wheel simulation results comparison with Narayanan and experimental results for the conventional silica gel desiccant

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Fig. 8

Validation of simulation results of moisture removal capacity with literature for the composite silica gel desiccant

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Fig. 9

Effect of moisture content of process air at inlet in terms of moisture removal capacity

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Fig. 17

Effect of moisture content of regeneration air at inlet in terms of average process air outlet temperature

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Fig. 21

Effect of adjustable regeneration section angle

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Fig. 10

Effect of moisture content of process air at inlet in terms of moisture removal efficiency

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Fig. 11

Effect of moisture content of process air at inlet in terms of average process air outlet temperature

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Fig. 12

Effect of temperature of process air at inlet in terms of moisture removal capacity

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Fig. 13

Effect of temperature of process air at inlet in terms of moisture removal efficiency

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Fig. 14

Effect of temperature of process air at inlet in terms of average process air outlet temperature

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Fig. 15

Effect of moisture content of regeneration air at inlet in terms of moisture removal capacity

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Fig. 16

Effect of moisture content of regeneration air at inlet in terms of moisture removal efficiency

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Fig. 18

Effect of temperature of regeneration air at inlet in terms of moisture removal capacity

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Fig. 19

Effect of temperature of regeneration air at inlet in terms of moisture removal efficiency

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Fig. 20

Effect of temperature of regeneration air at inlet in terms of average process air outlet temperature

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Fig. 22

Effect of adjustable regeneration section angle

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