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Design of TETHYS: A Greenhouse Plant-Smart Water Harvesting and Air-Cleaning System
Summary
Researchers designed the TETHYS system — a greenhouse water harvesting and air cleaning unit that uses a desiccant wheel to extract water from indoor air while simultaneously capturing airborne pesticides and microplastics from exhaust airflow, maintaining optimal crop conditions via sensor-driven control.
A framework to formulate a multiscale model based on the “speaking plant” approach is proposed. It is composed of a network of sensors to assess plant physiological conditions and a desiccant dehumidification and air-cleaning system directly interconnected with a greenhouse exhaust fan system. The system, namely TETHYS is a water production unit that extracts water from greenhouse indoor air using a desiccant wheel and simultaneously minimizes the outflow of airborne pesticides and microplastics, thus protecting human health and the environment. For maintaining optimum crop conditions, the model directly monitors and evaluates plant responses to their environment on a real-time basis and signals the greenhouse exhaust fan motor to ramp up. Considering TETHYS advantages over programmable greenhouse climate time-based controller devices, it is a powerful “green tool” that can be used in greenhouses.