Low-resistance mixed ventilation cooling system and control method

By installing axial flow fans and wind-blocking roller shutters on the cooling tower, and combining them with a controller to achieve free switching between natural ventilation and mechanical ventilation, the problem of insufficient cooling system capacity of generator sets at low load and peak conditions is solved, the environmental adaptability and operational control flexibility of the cooling system are improved, and the cooling tower's resistance to strong winds and antifreeze is enhanced.

CN121804256APending Publication Date: 2026-04-07NORTHWEST ELECTRIC POWER DESIGN INST OF CHINA POWER ENG CONSULTING GRP
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Patent Information

Application Number
CN202511966000.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

The existing generator sets have a large margin in the cooling system under low load conditions, but insufficient output of the cooling system at peak conditions, which affects the load adjustment response speed and stability, especially showing a weakness in insufficient output under severe weather conditions.

Method used

A low-resistance hybrid ventilation and cooling system is designed. By installing an axial flow fan, a wind-blocking roller shutter, and a cooling triangle on the cooling tower, and combining them with a controller, the system can freely switch between natural ventilation and mechanical ventilation. The operation and maintenance parameters are used to control the start and stop of the axial flow fan and the wind-blocking roller shutter, thereby optimizing the operation mode of the cooling system.

Benefits of technology

It improves the environmental adaptability and operational control flexibility of the cooling system, enabling timely matching of condenser cooling capacity, suppression of back pressure fluctuations, enhancement of cooling tower's resistance to strong winds and winter freeze protection, extension of fan service life, and reduction of maintenance costs.

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Abstract

The low-resistance mixed ventilation cooling system comprises an axial flow fan arranged on a cooling tower, wind shielding roller shutters are arranged on the portions, located on the two sides of the axial flow fan, of the cooling tower correspondingly, and the end faces of the sides, away from the axial flow fan, of the two wind shielding roller shutters are connected to a cooling triangle through wind guiding walls; the cooling triangle is connected with a cooling working medium conveying assembly; an electric winding and unwinding device is arranged on the wind shielding roller shutter, and the electric winding and unwinding device and a start-stop controller of the axial flow fan are in communication connection with a controller. The controller controls the axial flow fan and the wind shielding roller shutter to be started and stopped based on the obtained operation and maintenance parameters. Switching of the axial flow fan and the wind shielding roller shutter is controlled through operation and maintenance parameters, output of the cooling system is controlled by rapidly switching operation modes, the cooling capacity of the condenser is matched in time, back pressure fluctuation is effectively restrained, and unit peak regulation is adapted; meanwhile, the size of a conventional air cooling tower is reduced, and strong wind resistance and winter anti-freezing capacity of the cooling tower are improved.
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