Modeling of the process of solar drying of grapes in indirect type installations with natural air convection

Abstract

Abstract The paper models the process of natural convection of an indirect type dryer mathematically for the accumulation and absorption of heat which uses water. The data from the experiment conducted by the authors of the work is used as the initial data. The Reynolds equations and the temperature distribution equations are used for the mathematical model considering the Boussinesq hypothesis. The SIMPLE control volume method is used in the paper for the difference approximation of the initial equations. The temperature and velocity fields in the drying chamber are determined. It is revealed that the maximum speed in this mode is reached in the upper part of the dryer and it will be equal to 0.02-0.03 m/s.