Chilled water precision air conditioner and energy-conservation control method thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of air conditioning control, in particular to a chilled water precision air conditioner and an energy-saving control method thereof. Background technique [0002] Chilled water precision air-conditioning units are widely used in various medium and large data computer rooms. This type of data computer room generally uses screw chillers or centrifugal chillers to provide chilled water for the entire data center, and is equipped with chilled water precision air conditioners for each data computer room. Centralized cooling for servers or IT equipment to achieve high integration, centralized maintenance and management. Because this type of data center often has many computer rooms and more IT equipment, the number of chilled water precision air conditioners used in this type of data center is also very large. [0003] Due to the huge amount of heat generated by the data center and the large amount of data on the...

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a chilled water precision air conditioner and its energy-saving control method, aiming to solve the disadvantages of high energy consumption in the prior art and the problems of factors such as whether the water system is variable frequency or not. The problem of overdependence

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