Rotary-wheel dehumidification system and control method thereof

The invention discloses a rotary-wheel dehumidification system and a control method thereof. The rotary-wheel dehumidification system comprises a first-stage cooling unit, a fan, a second-stage cooling unit, a rotary wheel and a third-stage cooling unit which are sequentially arranged in the air inlet and outlet direction; the rotary-wheel dehumidification system further comprises a heating unit,a cold and hot water unit and a control device; regenerated air of the rotary wheel is heated through the heating unit and then input into the rotary wheel; the cold and hot water unit provides cold water or hot water for the first-stage cooling unit, the second-stage cooling unit, the third-stage cooling unit and the heating unit; and the fan, the rotary wheel and the cold and hot water unit areelectrically connected with the control device. According to the rotary-wheel dehumidification system, cooling of fresh air and heating of regenerated inlet air can be achieved through just the cold and hot water unit, the str