Combined dryer with high efficiency for drying high-moist agricultural products

The article discusses a two-chamber solar-fuel drying plant for drying various agricultural products, a distinctive feature of which is the presence of a water jacket and a rubble heat accumulator. Two electric heaters are recommended as heat sources of the dryer: the first is the main one and the second is intermediate. It was found that during daytime operation, solar radiation enters the surface of the drying chambers, and it heats the water in the jacket from 30 ° C to 65 ° C. The latter, in turn, through the chamber wall gives up its heat to the air flow circulating in the chamber space. At night, some of the heat is compensated by the heat accumulated in the water jacket and in the rubble heat accumulator. For rational and energy-saving operation of the drying plant, the modes of power regulation of electric heaters by means of a thyristor regulator have been substantiated. This can save up to 30% of the main power consumption. The paper provides a detailed analysis of the thermal and technical calculations of a rubble heat accumulator and a water jacket, and also determines the charging and discharging times of heat storage devices.

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