US Patent 12130083 Heat pump closed loop process drying

Methods, apparatuses, and systems for a closed loop product drying process are disclosed. Heated dry air enters a drying chamber, extracts moisture from a product to be dried, and exits the drying chamber, cooler and wetter. A heat pump air handler dries and warms the air from the drying chamber exhaust, and returns it to the drying chamber, in a closed air loop. The heat pump air handler includes a dehumidifier means in the closed air loop flow path. The dehumidifier means removes entrained moisture from wet air exiting the drying chamber, reheats the air, and returns it to the drying chamber.