The invention discloses a
chilled water precision air conditioner and an energy-conservation control method thereof, wherein the
chilled water precision air conditioner comprises a
chilled water precision air conditioner unit, a control cabinet connected to the chilled water precision air conditioner unit, a return-
air temperature sensor arranged in the chilled water precision air conditioner unit, a speed-adjustable draught fan, chilled water valves, a chilled water coil
pipe, a chilled water pipeline connected to the chilled water precision air conditioner unit and a chilled water pump. When the
cooling capacity demand is increased, the bigger chilled water valve is controlled to open firstly by the control cabinet, and secondly the revolving speed of the speed-adjustable draught fan is improved; when the
cooling capacity demand is decreased, the revolving speed of the speed-adjustable draught fan is lowered firstly, and the small chilled water valve is closed secondly. The chilled water precision air conditioner and the energy-conservation control method thereof have the advantages that the defects that the
energy conservation of the whole
system entirely depends on whether the frequency of a chilled water
system of a user is
convertible or not and the resistance change of the water pipeline exerts influence on the whole water
system energy conservation when the open of the water valves changes in a traditional method of adjusting the open of the water valves only are overcome, and error control and inaccuracy from
discharge variation to
differential pressure variation are avoided furthermore.