Solution of the mathematical model of their defrostation adapted to the pulse blocks

In the Russian Federation, there is a need for biologically active vitamin and antioxidant complexes of natural origin. At the present stage, it is possible to single out a promising universal bioactive composition, such as the carotenoid pigment complex lycopene (E-160d). From the recommended technological scheme for obtaining lycopene, two operations that are most energy-intensive and determine the quality of fi products can be distinguished, such as defrosting watermelon pulp, as well as drying the prescription mixture. In the case of defrosting watermelon pulp, which has a small block size, for example, in comparison with a sprat block, it is advisable to use air defrosting. When using a clean air environment for defrosting a block of watermelon pulp, the energy consumption for this process will obviously decrease in relation to steam-air defrosting. In addition, when saturated steam is used under atmospheric conditions (100 °C) in combination with air, the block with watermelon pulp will come into contact with the vapor-air environment at elevated temperatures, which is unacceptable in the lycopene technology, due to its possible destruction. In this case, it is reasonable to use room temperature air. The object of the study was blocks of pulp of ripe watermelons, provided their red color scale, which has a positive effect on the extraction of lycopene. The aim of the study is to determine the duration of the process of defrosting blocks of watermelon pulp within the temperature and technological limitations. To achieve this goal, temperature and technological limitations were identifi during the defrosting process; block freezing watermelon pulp, built and solved a mathematical model of mass transfer during defrosting by the fi difference method. The developed operating parameters for defrosting watermelon pulp in a chamber-type defroster, which include: the temperature of the air supplied to the defroster - 25±1 °C; air speed in the working chamber - 4±1 m/s; frozen briquette size - 0.15×0.15× 0.05 m can be used for process design.