Rejected heat at the evaporator, gained at the internal condenser
and input energy at the heater. The rejected heat at the
evaporator gained at the internal condenser and the input energy
at the heater could also be calculated from the inlet mass flow rate
of drying medium and the enthalpy changes within the drying time
as also shown in Eq. (22). The mass and energy flow in the control
volume of evaporator, internal condenser and heater is shown in
Fig. 1.