This work presents thermodynamic criteria for optimization of work-assisted drying operations and compares these criteria with those conventional drying operations in sequential systems. For the work-assisted operations, which run jointly with thermal machines, such as heat pumps, total power input is minimized at constrains which describe dynamics of energy and mass exchange. Finite-rate models take into account irreducible consumption of the classical exergy caused by lossy elements in the system. Optimal work functions, which incorporate a residual entropy production, are found in terms of end states, duration and (in discrete processes) number of stages. Mathematical analogies between entropy production expressions in work-assisted and conventional operations are helpful to formulate optimization criteria of the former.
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