Estudo numérico de um secador solar de exposição direta.

Abstract

Drying is a practice used in food preservation that still suffers many losses related to high temperatures, long periods of drying, among other factors, requiring equipment that will minimize these losses and provide increasingly smaller costs of the process, and the solar dryer addition to using clean energy, is a great technology for regions with high levels of solar radiation. Thus, this and many other processes can be easily simulated using commercial software available that aim to optimize and control the process. This paper aims to numerically evaluate the behavior of termofluidodinâmica in a solar dryer of direct exposure, helping the development of more efficient solar dryers to obtain final products with higher quality. Therefore, the numerical solutions were obtained using the commercial software ANSYS CFX, where they were presented and analyzed in the fields of temperature and pressure and air flow lines. In the results, it was observed that the temperature of the air within the direct exposure to solar dryer increases as it approaches the surface of glass and to lower air velocities there is a tendency for air to heat more intensely, due to its higher stay inside the solar dryer.