Control method of multi-machine-head variable-frequency centrifugal central air conditioning unit

Abstract

The invention relates to the field of air conditioners, in particular to a control method of a multi-machine-head variable-frequency centrifugal central air conditioning unit. The method includes the following steps that target temperature is set when freezing water flows out; refrigerating total amount is acquired; initial water inflow temperature is acquired; a compressor with the largest refrigerating amount in the central air conditioning unit is started, the difference between the initial water inflow temperature and current water inflow temperature is recorded, the difference between the initial water inflow temperature and the target temperature is recorded, and refrigerating demand amount of a whole system is made; remaining load is calculated, and when the remaining load is larger than the refrigerating amount of a remaining compressor in the optimal energy efficiency state, the second largest compressor is started so that the compressor can run in the optimal energy efficiency; when the remaining load is smaller than the refrigerating amount of the remaining compressor in the optimal energy efficiency state, a compressor with the refrigerating amount close to that of the remaining compressor is started, so that the remaining compressor achieves the optimal energy efficiency state sequentially; water outflow temperature of the freezing water is detected and compared with the target temperature; whether the air conditioner meets the machine stop condition is judged.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a control method for a multi-head variable frequency centrifugal central air-conditioning unit, which achieves relatively ideal energy-saving and cooling effects during the operation of the entire unit. Background technique [0002] With the society's demand for energy conservation, building energy conservation accounts for a large proportion, and in building energy conservation, air conditioning accounts for the largest proportion. In air conditioners, especially central air conditioners, many new energy-saving technologies have emerged, but the most advanced one is the application of magnetic levitation technology, and frequency conversion magnetic levitation centrifugal central air conditioners have been widely used in the market. [0003] Frequency conversion magnetic levitation centrifugal central air-conditioning unit, which is a central air-conditioning unit, its compressor...

AI Technical Summary

Problems solved by technology

When the actual temperature is higher than the target temperature, the cooling capacity of the compressor can be increased by increasing the frequency of the compressor motor, but the variable frequency compressor can not achieve the best energy-saving effect at any frequency, especially when multiple sets of compressor heads are combined , can not play the highest energy efficiency of each compressor

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