Abstract
Expensive fan wrecks and down time occurs when couplings break or gearboxes self-destruct. A viable alternative eliminates shaft, coupling, and gearbox moving motor to ground level, driving a hydraulic pump transmitting fluid under pressure. A hydraulic motor directly drives fan. Microprocessor controllers provide inexpensive energy conservation control. The energy conservation aspect alone pays for retrofit.
Miller, G. (1985). Air Movers of the Eighties. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from
https : / /hdl .handle .net /1969 .1 /93410.