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Thermodynamic analysis of an automobile brake system

Ahmet Mavi, Abide Banu Gündüz Altıokka, Oğuz Arslan


Energy and exergy analyses of an automobile's air-ducted disc brake system were performed in the current study. The experimental system consisted of the brake disc, calliper, linings, the electric motor to drive the brake disc, and a hydraulic pump to provide the oil pressure required to activate the brake unit. To simulate the braking process, the force is applied to the rotating brake disc at different brake pressures and the temperature change on the disc due to the braking action was measured. The braking system was evaluated thermodynamically by using these measurements obtained. The ideal brake force values were found around 200oC when continuous braking was adopted in the brake test. It was also noted that the brake force was decreased, and the braking process was weakened at the temperature of 250oC and above. Exergy destructions by the braking process were also calculated.

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