to 25-fold) when MWVD was used for finish drying of hot air pre-dried berries (Fig. 2c). Drying rate of berries under MWVD conditions differed significantly from drying rates under HACD and HACD + MWVD conditions (Fig. 2c). MWVD was divided into constant and falling rate periods. During MWVD, the initial drying rate was 4.4 102 min1
. The drying rate remained constant until the moisture content decreased below 3.49 ± 0.02 kg H2O kg1 DM. Across the analysed range of moisture content, higher drying rate was observed during MWVD than HACD of berries. The changes in the temperature were significantly different under HACD and MWVD conditions. The temperature of berries dried by HACD began to rise immediately until the achievement of dry-bulb temperature. In contrast, the temperature of berries dried by MWVD remained constant at about 45 C for 35 min (constant drying rate), and gradually increased up to around
90 C at the end of MWVD (second drying rate) (Fig. 2d).