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Variable-Mass Thermodynamic Analysis of Drying Process

[+] Author Affiliations
Yingbai Xie, Hang Su, Xuedong Zhang, Zhouxuan Xu

North China Electric Power University, Baoding, Hebei, China

Paper No. IMECE2008-67293, pp. 869-874; 6 pages
doi:10.1115/IMECE2008-67293
From:
  • ASME 2008 International Mechanical Engineering Congress and Exposition
  • Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C
  • Boston, Massachusetts, USA, October 31–November 6, 2008
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4871-5 | eISBN: 978-0-7918-3840-2
  • Copyright © 2008 by ASME

abstract

Drying is the complex process which involving simultaneous heat, mass and momentum transfer phenomena. The variable-mass thermodynamic viewpoint is introduced to analysis the drying process. For a closure heat pump drying equipment, variable-mass thermodynamic models based on the first law are constructed. Calculations on the rate of moisture removal and supply airflow are done based on the values of experimental data. The efficiency of drying process is calculated with the variable-mass and the classical thermodynamic method; the two methods have the same result. And the variable-mass thermodynamic analysis reveals that only under the rigorous conditions, drying can be treated as isenthalpic process.

Copyright © 2008 by ASME
Topics: Drying

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