The present invention provides a ventilating assembly for a cooling tower comprising a hydropower device (l), a ventilating fan (2), a hub (3), a first fluid pipe
(a) and a pump (6). The hydropower device (1) is connected to the first fluid pipe (4)
whereby the water is driven to flow from the first fluid pipe (4) to the hydropower device (l) by the pump (6) which controls water pressure. The water flowing through
the hydropower device (1) in which a propeller is mounted to transmit power via the
hub (3) for rotating the ventilating fan (2). One end of the hub (3) is connected to the
hydropower device (1) and another end of the hub (3) having a shaft is connected to
the ventilating fan (2). The water which transmitted power to the ventilating tan (2)
and came out of the hydropower device (1) is then circulated into the heat transfer
process.