Control method of fixed frequency plus variable frequency compressor for industrial cooler
A variable frequency compressor and control method technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of difficult to achieve temperature control accuracy, increase compressor power consumption, etc., so as to alleviate the impact of the power grid and prolong the service life , The effect of improving the temperature control accuracy
Active Publication Date: 2015-07-29
广东吉荣空调有限公司
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Problems solved by technology
[0002] Traditional fixed-frequency compressors are difficult to achieve the temperature control accuracy required by users, and increase the power consumption of the compressor
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[0009] Refer to attached figure 1 , a control method for fixed frequency and variable frequency compressors of industrial coolers, the main control object is the variable frequency compressors, setting the starting temperature point of the variable frequency compressor, the starting temperature point of the fixed frequency compressor, the stop temperature point of the variable frequency compressor, the fixed frequency The stop temperature point of the compressor, the minimum frequency of the variable frequency compressor, the maximum frequency of the variable frequency compressor, and the frequency to be executed by the variable frequency compressor are F n+1 and the last frequency F that the inverter compressor has performed n , the control method is: when the water pump starts, if the outlet water temperature is higher than the set temperature, then start the variable frequency compressor, the initial start frequency is F 0 , F 0 Usually it is set to 80Hz. After the invert...
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The invention relates to a method adopted for controlling an air conditioning unit provided with a fixed-frequency compressor and an inverter compressor. After a water pump is started, the inverter compressor is started if the outlet water temperature is higher than a set temperature; after the inverter compressor is started, the outlet water temperature is detected; when the outlet water temperature is high than a set temperature +t, the operation frequency of the inverter compressor is F[n+1], F[n+1]=F[n]+ / -K[t], the frequency K[t] is added to the last executed frequency F[n] of an inverter, and circulation is carried out in this way till the inverter compressor operates to reach the largest frequency. When the outlet water temperature is lower than the set temperature, the frequency K[t] is subtracted from the last executed frequency F[n] of the inverter, and circulation is carried out in this way till the inverter compressor operates to reach the smallest frequency. When the -t value reaches -T value, the inverter compressor is shut down, wherein T is the control accuracy value; after the inverter compressor is shut down, a control program for starting the inverter compressor is executed again if the outlet water temperature rises to reach the set temperature. The method has the advantages that the fixed-frequency compressor and the inverter compressor will not start and stop frequently, and thus the service life of the compressors is prolonged; the method is high in control accuracy, and energy is saved.
Description
technical field [0001] The invention relates to a control method adopted by an air-conditioning unit equipped with a fixed-frequency compressor and a variable-frequency compressor. Background technique [0002] Traditional fixed-frequency compressors are difficult to achieve the temperature control accuracy required by users, and increase the power consumption of the compressor. For some specific fields, the temperature control accuracy of the air-conditioning unit is required to be within ±0.1-0.5°C, and high control accuracy cannot be achieved by on-off control or segmented control of the fixed-frequency compressor. Even in the field of industrial air-conditioning, the compressor power It is relatively large, and it is necessary to use compressor frequency conversion technology to achieve relatively high temperature control accuracy. Contents of the invention [0003] The object of the present invention is to provide a control method for a fixed-frequency plus variable...
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IPC IPC(8): F25B49/02
Inventor 陈锐群郑泽顺刘庆瑜黄培炫郑洁波李炼鹏
Owner 广东吉荣空调有限公司