Control strategy for ventilation system of sewage sludge solar dryer

Piotr Krawczyk


Control of low-temperature drying facilities using unprocessed air causes multiple difficulties due to major variability of ventilation
air properties, both daily and seasonal. This paper presents an analysis of operating parameters of a sludge solar drying
plant based on an approach that uses the concept of ventilation air drying potential. Formulas for the drying rate as a function
of temperature and humidity of the ventilation air are given. Analysis results are used to propose recommendations for control
strategy for such facilities aimed at improving efficiency and lowering power consumption. The analytical work was based on
experimental data collected during operation of a test solar sludge drying facility located at a waste water treatment plant in
Skar˙zysko-Kamienna (Central Poland).

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