Flywheel Energy Storage Systems (FESS) rely on a mechanical working principle: An electric motor is used to spin a rotor of high inertia up to 20,000-50,000 rpm. Electrical energy is thus converted to kinetic energy for storage. For discharging, the motor acts as a generator, braking the rotor to produce electricity.
As shown in Fig. 1, a typical flywheel energy storage system (FESS) consists of a flywheel, motor/generator (hereinafter referred to as the “motor”), bearings, sealed chamber, inverter, and auxiliary equipment such as vacuum and cooling devices.
The reason is the total heat transfer rate decreased, causing heat to accumulate in the housing and transfer axially. Fig. 21. Distribution & comparison of FESS components exergy destruction rate. 5.4. Thermal characteristics prediction for 500 kW flywheel energy storage system
This will reduce motor power and affect the normal operation of the system. For vertical flywheel energy storage systems, most of the exergy loss in the heat transfer process is concentrated in the motor stator, casing, and cooling water. As the power increases, the proportion of exergy loss in the stator decreases.
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