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Paper machine is a big water consumer, including white water system, sewage system, sealed water system, sprinkler system, clean water system, etc. Normally, it needs to use pipe network constant pressure water supply, but traditional pressure control is through bypass and The control valve is used, and the frequency converter is rarely used. However, due to the general lack of water resources in China, the application of frequency converters will save 10% of water and 30% of energy, which will inevitably reduce the daily operating costs of paper mills.

As a key energy-consuming equipment inside a building, the power consumption of the central air-conditioning system generally accounts for more than 40% of the power consumption of the entire building. The central air-conditioning unit is designed to meet the maximum cooling and heat of the place of use. In practical applications, when most users are in use, the cooling and heating load varies. Generally, there is a lot of difference between the maximum design cooling and heating. The big difference is that more than 90% of all parts of the system are running in a non-full load rated state. Traditional central air-conditioning water and air systems all use valve or damper opening to adjust the water and air volume. The disadvantage of this adjustment method is not only that it consumes a lot of energy, but also the adjustment quality is difficult to achieve the ideal state, resulting in poor air conditioning comfort .