A thermodynamic model of a hydraulic circuit has been developed that describes the influence of viscosity and pressure on the oil temperature in different parts of the circuit. We have compared the predictions of this model with actual fluid temperature measurements in two circuits equipped with a medium and a high pressure vane pump respectively. Maximum efficiency is attained when the viscosity of the hydraulic fluid is optimized for the final equilibrium operating temperature. High viscosity index fluids contribute effectively to the control of oil temperature increase.
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