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Energy-saving central air conditioner automatic control system

An automatic control system, central air conditioning technology, applied in air conditioning systems, heating and ventilation control systems, control inputs involving air characteristics, etc. Effect

Inactive Publication Date: 2017-07-07
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to various reasons, a large part of the motors using frequency converters are open-loop and manual, which still cannot achieve the desired power-saving effect

Method used

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  • Energy-saving central air conditioner automatic control system
  • Energy-saving central air conditioner automatic control system
  • Energy-saving central air conditioner automatic control system

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Embodiment Construction

[0019] The central air-conditioning control system proposed by the present invention involves control loop instruments including: chilled water temperature sensor, terminal room temperature sensor, cooling water temperature sensor, chilled water flow sensor, cooling water flow sensor, controller (based on PID control realized by PLC controller or advanced algorithm controller based on industrial computer), motor frequency converter, etc. The specific implementation method is as follows: (1) In the automatic control circuit of chilled water temperature, the return water temperature detection value is compared with the set value (this value can be given by an optimization algorithm), and then sent to the controller. Before the control loop is put into automatic operation, the parameters of the PID controller are designed according to the model obtained from system identification. In the debugging and running stage of the control loop, the controller parameters are corrected and ...

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Abstract

The invention belongs to the technical field of air conditioner automatic control and particularly discloses an energy-saving central air conditioner automatic control system. A central air conditioner system comprises the four subsystems of a host system, a freeze water circulation system, a tail end temperature system and a cooling water circulation system. The central air conditioner automatic control system further adopts a PLC, a frequency converter, certain special instruments and conventional instruments in evaporation and condensation and is provided with a PID adjusting function controller, the following closed-loop control loops, with a dynamic feedback function, is formed, of (1) a freeze water temperature automatic control loop, (2) a tail end room temperature automatic control loop, and (3) a cooling water temperature automatic control loop. When the load of the central air conditioner system changes, through the closed-loop control loops with the dynamic feedback function, on the premise that the tail end room refrigeration temperature requirement is met, the energy-saving target can be achieved by automatically adjusting the work state of the equipment.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning automatic control, and in particular relates to a central air-conditioning automatic control system. Background technique [0002] Central air-conditioning systems have been widely used in industrial and civil fields, such as hotels, hotels, office buildings, shopping malls, hospitals, modern industrial plants, etc. Compared with petrochemical, electric power, steel and other process industries, central air-conditioning control technology still has room for substantial improvement. For a long time, most of the central air-conditioning systems are still operating in the traditional mode. When the ambient temperature and the actual use area of ​​the air-conditioning change, the motors are fixed at the power frequency and run at full speed, causing a lot of energy waste. In recent years, this problem has attracted extensive attention from the domestic and foreign refrigeration industry and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F3/00F24F11/00
CPCF24F3/00F24F11/30F24F11/62F24F11/83F24F2110/00F24F11/63F24F11/85Y02P20/10
Inventor 汪兴轩孙德敏
Owner FUDAN UNIV
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