Authors: E.Yu. Pudov, K.K. Zang, E.G. Kuzin, V.N. Shakhmanov, A.E. Krivenko

Title of the article: Influence of ambient temperature and type of working fluid on thermodynamic equilibrium of hydraulic system of excavators

Year: 2021, Issue: 1, Pages: 45-50

Branch of knowledge: 05.05.06 Mining machines

Index UDK: 622.23

DOI: 10.26730/1816-4528-2021-1-45-50

Abstract: The portion of the power representing the losses in the hydraulic system during operation will be converted into heat to heat the working fluid. Simultaneously with the process of heating the working fluid, heat is transferred from this system to the environment. Thermodynamic equilibrium of the hydraulic system in open-pit mining machines is achieved when the amount of energy loss, converted into heat in the hydraulic system, becomes equal to the value of the heat flux released to the environment from this system. Thermodynamic equilibrium of the hydraulic system significantly affects the efficiency of operation, reliability and frequency of hydraulic system failures, service life of the working fluid and hydraulic elements. When thermal equilibrium is established, the temperature of the working fluid becomes stable and maximum for a given operating mode of the hydraulic system. The thermodynamic equilibrium of a hydraulic system can change due to the influence of many factors, two of which are the ambient temperature (external factor) and the type of working fluid (internal factor). The article presents the results of a study of the influence of these two factors on the change in thermal equilibrium, as well as the maximum operating temperature of the working fluid in the hydraulic system of a mining excavator.

Key words: hydraulic excavator hydraulic system viscous friction power loss hydraulic fluid temperature thermodynamic balance heat transfer natural convection forced convection infrared thermography

Receiving date: 16.11.2020

Publication date: 29.04.2021

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