METHOD OF CONTROLLING AIR FLOW IN VENTILATION UNIT AND DEVICE FOR IMPLEMENTATION THEREOF Russian patent published in 2024 - IPC F24F11/63 F24F7/00 

FIELD: physics.

SUBSTANCE: proposed solutions relate to automatic correction of operating mode of fan frequency converter depending on changes of physical parameters of air flow at provision of specified speed. In the air flow control method in the ventilation unit, the air flow parameters of the ventilation unit are determined, for which the reference air flow voltage Uref, air flow temperature in the air duct, its static and dynamic pressure are measured, based on which the air flow rate is determined, converted to DC voltage Uv, the obtained Uv is compared with Uref and according to the results generating the output electric signal supplied to the DC voltage converter to the frequency of control and supply of the asynchronous motor of the fan in the air duct for automatic correction of the operating mode of the fan, wherein the air flow control device in the ventilation plant comprises an air flow rate to DC voltage converter, reference voltage source and voltage difference amplifier, temperature sensor and dynamic pressure sensor.

EFFECT: solutions provide higher reliability and accuracy of accounting for changes in physical parameters of air flow to maintain specified air flow rate, which is proportional to mass flow rate, which allows reducing power consumption while maintaining normalized air flow.

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