The HFESS Solution
Introduction
Circle Energy’s Hybrid Flywheel Energy Storage System (HFESS) is a next-generation mechanical battery. It provides a significant competitive advantage by overcoming the limitations of conventional flywheels, chemical batteries and diesel generators. In contrast to these systems, HFESS delivers long-life, fire-safe, high-density energy storage that is logistically superior and strategically sustainable.
Differentiating Factors - The Why
Conventional flywheel energy storage solutions are typically used in applications requiring short-term, high power delivery such as uninterruptible power supply (UPS) or grid ancillary services, including smoothing power fluctuations and power quality improvement.
Unlike legacy technology, Circle Energy's HFESS is capable of storing a large amount of energy (over 1 MWh) and supply it over an extended period of time (multiple hours), effectively broadening its use cases to situations where chemical batteries or diesel gensets are usually used: medium to long-term energy storage in residential, commercial, industrial and military applications, remote microgrids and off-grid power, portable energy supply, EV charging, etc.
The HFESS furthers offer major advantages over chemical batteries in design, performance, and sustainability:
1) single, uniform design that's easy for personnel to become conversant with and operate.
2) lasts over 100,000 cycles with no performance degradation over time, even under full discharges
3) requires no maintenance for over 20 years and does not require frequent replacement
4) non-flammable and safe for all transport modes without restrictions, including air.
5) reliable performance across a wide temperature range and in harsh environments
6) no toxic materials, largely recyclable with none of the end-of-life issues associated with batteries
7) capable of high power output and fast recharge times
8) designed and built in Australia, no reliance on geopolitically-sensitive materialsupply chains
Core Features - The How
Flywheels can typically be categorised as two different types:
1) low inertia rotors made with fibre-reinforced polymers (FRP) that can withstand high rotational speeds
2) high inertia rotors made with metal that spin at relatively low speeds
In contrast, Circle Energy's HFESS features a hybrid construction combining the high density of metal with the strength of FRP, allowing the rotor to attain a high inertia without compromising on high rotational speed. As the energy capacity of a flywheel increases with both its inertia and rotational speed, the HFESS is able to store significantly more energy than either type of conventional flywheels.
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