Group control method and equipment for chilled water system of central air conditioner

Abstract

The invention discloses a group control method and equipment for a chilled water system of a central air conditioner. The group control method comprises the steps that a target control value ST and an allowable deviation value DT of the chilled water system are set; all Q compressors which are not locked are found out from the M compressors, a compressor Ck with the shortest running time is found out, a host Uk of the Ck serves as a target control unit, and a water pump Pk of the host Uk is started; the total return water temperature or the total outlet water temperature of the chilled water system is obtained, and a metering value CT is obtained according to the total return water temperature or the total outlet water temperature; and according to the numerical relationship between the metering value CT and the target control value ST as well as the deviation value DT, the Q compressors are determined to be loaded or deloaded. According to the numerical relation between the metering value CT and the target control value ST and the deviation value DT, loading or unloading is conducted on the compressors in the system, so that group control automation of the central air conditioner chilled water system is achieved, balanced operation between the compressors and balanced operation between the water pumps are guaranteed, and the operation stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of central air-conditioning group control, and in particular relates to a group control method and equipment for a central air-conditioning chilled water system. Background technique [0002] The central air-conditioning group control system enables the building system to have the ability to sense the temperature of the human body, and it can realize the control of group-controlled cold (hot) water units based on different temperatures, time and needs. In the central air-conditioning system, the capacity of the refrigeration main unit, chilled water pump, cooling water pump, cooling tower fan and terminal equipment is selected according to the maximum load of the building, and a margin of 10% to 15% is left, so that in a year During the four seasons, the system works under the fixed maximum water flow and maximum air volume for a long time. However, due to changes in seasons, day and night, and user loads, ...

AI Technical Summary

Problems solved by technology

However, manual adjustments are often not timely and accurate enough to keep the air conditioning unit running in an efficient and energy-saving manner, and the group control efficiency is low

With the development of technology, there is also a method to realize the stable and energy-saving operation of the group control system by adjusting the balanced operation of the compressors, but this method does not take into account the operating conditions of the water pumps, so that the water pumps are in operation. Frequent failure events

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