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Endoreversible Modeling of a Hydraulic Recuperation System.

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Summary

Hydraulic recuperation systems capture braking energy, reducing fuel use and emissions. Optimizing accumulator volume and hydraulic unit displacement significantly boosts energy savings in hybrid vehicles.

Keywords:
compressible fluidendoreversible thermodynamicsenergy recoveryhydraulic systemsnon-equilibrium thermodynamicspressure lossesvan der waals fluid

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Area of Science:

  • Mechanical Engineering
  • Thermodynamics
  • Sustainable Transportation

Background:

  • Hybrid drive systems offer reduced fuel consumption and emissions by recovering braking energy.
  • Hydraulic recuperation systems are ideal for commercial vehicles, especially those with existing hydraulic infrastructure.
  • Previous research focused on individual components or control strategies, neglecting thermodynamic impacts.

Purpose of the Study:

  • To investigate thermodynamic effects on the energy-saving potential of hydraulic recuperation systems.
  • To model the system using endoreversible thermodynamics for accurate energy saving estimations.
  • To analyze the influence of design and loss parameters on overall system efficiency.

Main Methods:

  • Utilizing endoreversible thermodynamics for system modeling.
  • Estimating dynamical behavior and energy savings with real vehicle data.
  • Performing sensitivity analysis by varying design parameters like accumulator volume and hydraulic unit displacement.

Main Results:

  • Predicted energy savings of approximately 10% during vehicle acceleration.
  • Estimated reduction of about 58% in energy transferred to conventional disc brakes.
  • Identified accumulator volume and hydraulic unit displacement as key parameters influencing energy savings, more so than heat transfer coefficients or pipe diameter.

Conclusions:

  • Thermodynamic analysis is crucial for optimizing hydraulic recuperation systems.
  • System design parameters, particularly accumulator volume and hydraulic unit displacement, critically impact energy recovery efficiency.
  • The study provides a framework for enhancing energy efficiency in hybrid commercial vehicles.