Abstract: A system and method are provided for cooling transformers utilizing a fluid to air heat exchanger to cool dielectric fluid flowing through the transformer. The system includes multiple vertical cooling tubes in fluid communication with the transformer to cool the dielectric fluid. The tubes are configured to create vertical air passages such that the system utilizes natural convection air flow and thermal siphoning to cool the fluid.

Abstract: An air cooler for an enclosed frame motor wherein two air-to-air heat exchangers are located in an enclosure mounted above an opening in the frame. The heat exchangers are disposed so that the heat exchanger coolant tubes extend transversely to the longitudinal axis of the motor drive shaft. The heat exchangers are positioned at opposed ends of the motor and inclined toward one another in an A-shaped configuration. The enclosure forms an enclosed region with the frame, isolating motor air inside the region from ambient air outside the region. An intake plenum is coupled with the enclosure on one side to direct ambient air into the interior of the heat exchanger coolant tubes at one end, whereby the ambient air exits from the tubes at the other end. Motor air surrounding the motor is heated during operation and circulated by an internal fan among the heat exchangers.