The technique outlined in this SAE Recommended Practice was developed as part of an overall program for determining and evaluating fuel consumption of heavy-duty trucks and buses, but it is applicable to off highway vehicles as well.
It is recommended that the specific operating conditions be carefully reviewed on the basis of actual installation data. Cooling requirements are affected by all heat exchangers that are cooled by the fan drive system. These may include radiators, condensers, charge air coolers, oil coolers, and others.
Because of the variation in size, shape, configuration, and mountings available in cooling fans and fan drive systems, specific test devices have not been included.
Using known power/speed relationships for a given fan, this procedure can be used to calculate the fan drive system’s power consumption for engine cooling systems using fixed ratio, speed modulating, and on/off fan drives. This power consumption may then be used in determining engine net power per SAE J1349. For fan power/speed relationships, refer to SAE J1339.
Rationale
The rationale for this document is to provide a method for determining the power consumption of various types of fan drive systems.
The Cooling Systems Standards Committee is part of the Vehicle Engineering Systems Group and reports to the Motor Vehicle Council. The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to engine cooling systems and components for automobiles and light trucks, heavy duty on-and off-highway vehicles and industrial equipment. All standards reflect the latest technology and industry practice through advisement, consultation and cooperation with industry, government, educational institutions, the public, other standardizing bodies, and other SAE committees and members. Participants in the SAE Cooling Systems Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties, who assist the SAE Engineering Activity Board through the preparation and presentation of technical papers at national meetings and specialty conferences.
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Test Method for Determining Power Consumption of Engine Cooling Fan Drive Systems
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Test Method for Determining Power Consumption of Engine Cooling Fan Drive Systems
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