Volume 23, Issue 14 pp. 1277-1291
Research Article

The contact factor for dryer performance and design

S. K. Chou

Corresponding Author

S. K. Chou

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, SingaporeSearch for more papers by this author
M. N. A. Hawlader

M. N. A. Hawlader

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

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J. C. Ho

J. C. Ho

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

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K. J. Chua

K. J. Chua

Department of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

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Abstract

We describe an approach using the contact factor (CF) as the dryer performance and design parameter. The CF is calculated using known drying variables with a view to minimizing the drying costs. An algorithm to obtain the ‘economic’ CF for drying is presented. Besides being a design parameter of single-stage dryers, the CF is a useful parameter in determining the schedule of cascade dryers in multi-stage drying. We demonstrate the dryer component selection process using a set of design charts for heat pump dryers. Copyright © 1999 John Wiley & Sons, Ltd.

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