Energy-saving frequency conversion control method for water pump of central air conditioner

Abstract

The invention discloses an energy-saving frequency conversion control method for a water pump of a central air conditioner. The energy-saving frequency conversion control method comprises the following steps: monitoring the total water supply temperature and the total water return temperature of chilled water after a system runs to obtain a water supply and return temperature difference delta T, and when the delta T is equal to a set value delta T0, indicating that the running state of the water pump does not need to be changed; when deltaT is smaller than deltaT0, indicating that the tail end load demand of the using side of an air conditioning system is reduced, calculating the flow Gdown needing to be reduced of chilled water, and carrying out frequency conversion adjustment on the water pump on the premise that the flow of the chilled water is reduced, wherein the final optimization target is the comprehensive minimum water pump shaft power; and when delta T is larger than delta T0, indicating that the tail end load requirement of the using side of the air conditioning system is increased and decreased, calculating the increased and decreased flow Gup of chilled water, carrying out frequency conversion adjustment on the water pump on the premise that the increased flow of the chilled water is guaranteed, wherein the final optimization target is the comprehensive minimum water pump shaft power. Thus, the purpose of further reducing energy consumption under variable-frequency regulation control of the water pump is achieved.

Description

technical field [0001] The invention relates to the field of HVAC equipment control, in particular to an energy-saving frequency conversion control method for a central air-conditioning water pump. Background technique [0002] The water pump is the power equipment of the central air-conditioning water circulation system, which is used to transport the cold and hot water of the air-conditioning system in the air-conditioning system. In practical engineering applications, in order to meet the demand for large flow of air-conditioning water, multiple water pumps are often connected in parallel to run in the pipeline system. Multiple water pumps connected in parallel can be of the same model or of different models. [0003] The selection of central air-conditioning system equipment is based on the conditions of the maximum operating conditions of the project. However, the system actually operates at partial load most of the time, and the energy consumption of the air-conditio...

AI Technical Summary

Problems solved by technology

[0007] When the frequency conversion of the water pump adjusts the air-conditioning water flow to meet the change of the end load of the air-conditioning system, if multiple water pumps operate in parallel, on the premise of matching the total flow of air-conditioning water, it cannot Precisely adjust the appropriate operating frequency for each pump to achieve the optimal chilled water delivery coefficient

The actual approach is to adjust the running parallel pumps one by one or synchronously, especially in the case of parallel connection of different types of pumps, there is still room for further improvement in the energy consumption of the pumps.

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