Intelligent cluster control system of central air-conditioning

Abstract

The invention discloses a central air-conditioning intelligent group control system, comprising a host, a cooling tower, a cooling pump, a central processor, and a data collector, a cooling reflux output temperature sensor, a freezing reflux output temperature sensor, a freezing reflux output pressure sensor, a controller connected with the central processor for reading the parameters of a frequency changer via on-site bus, and a network gate between the host and the controller. The sensor is connected with the data collector which can transmit the signal of sensor to the central processor. The invention uses several parameters to group control to fully utilize frequency change technique to reduce the abundant refrigeration most. And the invention uses the controller to on-time memory the data of air conditioner, to show variable power curvatures, watched and modified by user.

Description

technical field [0001] The invention relates to the technical field of automatic control of air conditioners, in particular to an intelligent group control system for central air conditioners. Background technique [0002] The existing central air-conditioning system is generally composed of multiple hosts, multiple refrigeration pumps, and multiple cooling towers connected in parallel. One host is equipped with one refrigeration pump, cooling pump, and cooling tower. The control methods mainly include the following types: 1. Direct power frequency valve control; 2. Direct frequency conversion control; 3. Pressure difference frequency conversion control; 4. Temperature difference frequency conversion control; 5. Return water temperature control. The above five control methods all use the control of cooling water flow, chilled water flow and cooling tower air volume and the automatic optimization of the main engine to achieve the effect of energy saving. The first control me...

AI Technical Summary

Problems solved by technology

The first control method is power frequency control, which has the worst energy-saving effect; the other four are frequency conversion control, which has improved energy-saving effect and control accuracy, but still fails to make the air-conditioning system work at the lowest energy consumption state

[0003] At present, when using frequency conversion technology to save energy, the host, refrigeration pump, cooling pump, and cooling tower are artificially turned on, and the pump and tower are closed-loop frequency conversion control, and the host is automatically optimized. However, there are two major drawbacks in this way. First, when a set of configurations is not enough When one or two sets of configurations are used too much, it is necessary to manually start or stop the second set of configurations. The accuracy of the artificial operation method is limited after all, which may easily lead to insufficient or too much cooling capacity of the air conditioning system, resulting in high or low ambient temperature. , there is a phenomenon of sometimes cold and sometimes hot; second, even if a system is sufficient, the existing air conditioning control system has not fully utilized the power-saving technology of frequency conversion, that is, the flow and frequency (that is, the speed of the fan) Proportional, power is proportional to the cube of the frequency, so energy consumption minimization cannot be achieved

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