Wireless sensor network-based central air-conditioning control system and method

Abstract

The invention discloses a wireless sensor network-based central air-conditioning control system and a wireless sensor network-based central air-conditioning control method. The system consists of a chilled-water control subsystem, a cooling-water control subsystem, and a wireless sensor network-based master control system. Due to the inherent hysteresis characteristic of the chilled (cooling) water system, the time synchronization processing is performed on the water outlet / return temperature; the rotating speeds of a water pump and a fan are adjusted by adopting the fuzzy feedback control; and the control quality and comfort of the system are improved. The real-time room temperature of an air-conditioning area is acquired based on a wireless sensor network; and an unoccupied room is detected by combining a Fresnel lens pyroelectric infrared sensor, namely, the feedforward control of the rotating speeds of the chilled (cooling) water pump and the fan is carried out according to a real-time load and a load change value of the air-conditioning, so that the comfort and energy consumption index of the central air-conditioning can be further improved. Based on rated temperature difference parameters of a domestic fan coil, an architecture for serially connecting the fan coil and a new fan unit is provided, and the energy conservation is realized according to the principle of cascade utilization of cold energy.

Description

technical field [0001] The invention belongs to the technical field of central air-conditioning control, and in particular relates to a central air-conditioning control system and method based on a wireless sensor network. Background technique [0002] With the advancement of my country's urbanization process, a large number of high-rise buildings and their supporting central air conditioners have emerged, and the energy consumption of central air conditioners accounts for more than 50% of the total energy consumption of buildings. Therefore, the business circles and academic circles have carried out extensive, in-depth and persistent research and practice on reducing the energy consumption of central air-conditioning. In view of the fact that the central air conditioner is designed according to the maximum load of 110% to 120%, and the actual load of the air conditioner is less than 50% of the design load 80% of the time, a solution is proposed that the cooling (heat) of th...

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Problems solved by technology

While increasing the temperature difference between supply and return water to reduce the energy consumption of the pump, it will lead to a decrease in the heat transfer efficiency of the fan coil unit

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