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.

This content is only available via PDF.
You do not currently have access to this content.