Patent ID: 9431948
Filing Date: 2016-08-30
CPC Classification: F04D,F28B,F28D,F28F,H02P,Y02B,Y10S

Claim Text:
1. An industrial air-cooled heat exchanger for cooling liquids used in an industrial process, comprising: a support structure; a tube bundle supported by the support structure, the tube bundle being configured to receive liquids to be cooled; a motor comprising a rotatable shaft, a stator and bearings that locate and support the rotatable shaft; a fan connected to the rotatable shaft of the motor such that rotation of the rotatable shaft causes rotation of the fan which causes an airflow that cools the liquids flowing through the tube bundle; wherein the support structure positions the tube bundle, the fan and the motor at a predetermined height above ground level; sensors to measure vibrations of the bearings and output signals representing the measured vibrations; and a variable motor-speed control device to generate electrical signals that cause rotation of the rotatable shaft of the motor at a predetermined rotational speed in order to rotate the fan, the variable motor-speed control device having an input for receiving control signals representing the predetermined rotational speed of the motor.