This paper briefly analyzes the present situation of textile mill's air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill's air-conditioning system because of the influence of various factors such as the differences in seasons,regions,etc.,most air-conditioning equipment can not be controlled automatically. This paper suggests utilizing multi-function data acquisition card to collect the data about the temperature and humidity of a workshop,processing the data on a PC,comparing them with the expert database,and then using the 485 serial port expanding module to output the parameters,which are used to control the inverter,so that the purpose of adjusting the temperature and humidity of the workshop is achieved.
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