Hybrid solar-electric dryer with wide temperature range and continuous operation

Abstract

The hybrid solar dryer has been designed for continuous use under optimum energy consumption conditions, with control of temperature, humidity and air flow. The dryer enables efficient drying while preserving product quality. The operating temperature range varies from ambient to 300°C. The solar collector is powered both by solar radiation and by the combustion of drying air below the absorber. At its outlet, the collector is equipped with electric resistors with power ranging from 1 to 6 kW. The dryer is equipped with an on-board controller that monitors and controls temperature, humidity and drying air flow. The controller is linked to the temperature, humidity and airflow sensor, as well as to weather data for precise regulation of the drying process.