Central air-conditioning energy-saving control system and control strategy thereof

Abstract

The invention discloses a central air-conditioning energy-saving control system and a control strategy thereof. The control system comprises a room load analysis module, an air volume control module, a chilled water flow control module, a cooling water flow control module, a cooling tower control module, an indoor temperature sensor group, a chilled water temperature sensor group, a cooling water temperature sensor group, an outdoor temperature/humidity sensor, a chilled water system terminal device, a cooling water system terminal device, an air system terminal device, connecting devices between various devices and a control cabinet for storing various data processing control modules. The control strategy directly directs regulation and control of the system according to room load change, involving calculating room load fluctuation according to room temperature change and converting the room load fluctuation into a real-time air volume regulating variable, a real-time chilled water flow regulating variable and a real-time cooling water flow adjusting variable. A water supply/return temperature distance control mode is a monitoring way for maintaining normal operation of the system. The system of the present invention is compact in structure, high in automation degree, high in intelligence degree, and stable and reliable in operation.

Description

technical field [0001] The invention belongs to the field of air conditioners, and in particular relates to a centralized air conditioner energy-saving control system and a control strategy thereof. Background technique [0002] With the rapid development of my country's economy, the pace of urbanization has gradually accelerated in recent years, and building energy consumption has accounted for the largest proportion of my country's energy consumption. According to incomplete statistics, as of 2014, my country's public building area has exceeded 10 billion square meters, and the annual energy consumption level of large public buildings is 1-3 times that of ordinary public buildings and 3-4 times that of residential buildings. A considerable part of energy consumption in large public buildings comes from centralized air-conditioning systems, so how to reduce air-conditioning energy consumption in public buildings will be an important part of my country's energy-saving and em...

AI Technical Summary

Problems solved by technology

However, there are several points to be improved in this device. One is the lack of intelligent control of the air system, that is, the air volume cannot be adjusted to adapt to changes in the indoor load, and the energy saving of the air system cannot be realized; the other is that the patent does not propose load changes and adjustment parameters. The correlation between the two, that is, only a simple hardware composition of intelligent control system is proposed, but there is no innovation in control strategy

[0004] In other similar intelligent control systems, regarding the adjustment of the water pump, only rely on the temperature difference between the supply and return water to guide the water volume adjustment and the frequency conversion of the water pump. There is considerable hysteresis in the process, and this hysteresis is more obvious in large-scale centralized air-conditioning systems, which greatly reduces the effect of water volume control guided by the temperature difference between supply and return water; in addition, the adjustment of chilled water volume occurs after the temperature difference between supply and return water. It will affect the cooling capacity and cannot meet the real-time load requirements of the room

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