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10. Internationales Fluidtechnisches

8. - 10. März | 2016
in Dresden

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16:25   ics       Saal 4

Hydraulic Energy Recovery System Utilizing a Thermally Regenerative Hydraulic Accumulator Implemented to a Reach Truck

First author:
Henri Hänninen, Aalto University, Finland

The implementation of an energy recovery system for retreiving otherways wasted
energy is an effective method for reducing the overall energy consumption of a mobile
machine. In a fork lift, there are two subsystems that can be effectively modified for
recovering energy. These are the driveline and the lift/lower function of the mast. This
study focuses on the latter by studying a recovery system whose main component is a
hydraulic transformer consisting of a hydraulic motor, a variable displacement pump and
an induction motor. Since the flow rate/pressure -ratio can be modified, the utilization of
the hydraulic transformer enables downsizing of the accumulator volume. However, the
decrease of the gas volume leads to an increase in the compression ratio of the
accumulator, which in terms leads to higher gas temperatures after charging and
consequently to higher thermal losses during holding phase. In order to reduce these
losses, a thermally regenerative unit was implemented to the gas volume of an
accumulator to reduce the temperature build up during charging. In this study, the effect
of improving the thermal characteristics of the accumulator to the efficiency of the whole
energy recovery system is investigated by means of measurements.