Energy-saving control method for central air-conditioning chilled water system

Abstract

The invention relates to an energy-saving control method for a central air-conditioning chilled water system. The method includes the steps: (A) acquiring the temperature and the humidity of air at an inlet and an outlet of each end device in a central air-conditioning system and calculating cold energy consumed by each end device in a plurality of previous time periods; (B) predicting the cold energy consumed by each end device in a next time period by taking measured value time sequence of the cold energy consumed by each end device as historical data; (C) accumulating predicted values of the cold energy consumed by all the end devices in the central air-conditioning system in the next time period, and taking the volume flow of the chilled water system calculated by accumulated values as a control target of the central air-conditioning chilled water system; (D) circularly executing the steps (A), (B) and (C) and continuously updating the measured value time sequence and predicted value time sequence by a shift operation method to control the volume flow of the central air-conditioning chilled water system. The energy-saving control method is low in operational energy consumption and fine in users' comfort.

Description

technical field [0001] The invention relates to air conditioning, in particular to a central air conditioning chilled water system. Background technique [0002] At present, the energy-saving optimization control strategies of central air-conditioning systems widely used have a common deficiency: that is, they basically use the concentration and hysteresis effect of the user's current load as the control basis, which cannot well reflect the actual situation of user load changes and ensure that all users comfort; the defect of the control mode has become a technical bottleneck to further reduce the energy consumption of central air-conditioning; with the development of network control technology, there is no technical obstacle to obtain the operating parameters, user information and environmental parameters of the central air-conditioning system terminal equipment. Therefore, it would be a more reasonable way to realize “on-demand adjustment” if the user load demand can be dy...

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Problems solved by technology

[0002] At present, the energy-saving optimization control strategies of central air-conditioning systems widely used have a common deficiency: that is, basically using the concentration and hysteresis effect of the user's current load as the control basis, which cannot well reflect the actual situation of user load changes and ensure that all users comfort; the defect of the control mode has become a technical bottleneck to further reduce the energy consumption of central air-conditioning; with the development of network control technology, there is no technical obstacle to obtain the operating parameters, user information and environmental parameters of the central air-conditioning system terminal equipment

However, the "constant pressure difference" and "constant flow" modes are also based on the concentration effect of user loads, and there are still obvious defects that cannot guarantee the comfort requirements of all end users and the energy-saving effect is restricted.

[0006] From the perspective of energy saving, adjusting the load of the air-conditioning cold source system according to the actual demand of the load has the best effect. Based on the temperature, pressure, flow and other information of the chilled water main pipe, fuzzy control and other methods are used to control the frequency converter; since the information based on this method is still not the actual load demand of the user, it is still based on the concentrated load of the user. Based on the energy-saving effect, it cannot fundamentally improve the comfort requirements of all end users, nor can it fundamentally improve the obvious defect that the energy-saving effect is restricted

[0007] The previous analysis shows that the current energy-saving control mode of the central air-conditioning system has a common deficiency: that is, the centralized effect of user load is used as the control basis, which cannot well reflect the actual situation of user load changes and ensure the comfort of all users. , that is, the defect of the control strategy has become the main factor affecting the energy-saving operation effect of the central air-conditioning system

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