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Zoltek discusses carbon fibre opportunities in the energy storage flywheel applications market
10/2/2014 |
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Smithers Rapra spoke exclusively with Bill Regan, VP of Engineering and Technology at Zoltek Corporation in the lead up to his presentation at GOCarbonFibre
Q. Please briefly describe your background in composites.
I have over 30 years of experience in the composite industry designing and building composite structures in marine and industrial applications. Most recently my involvement in the composite industry has been directing advances in carbon fibre manufacturing operational efficiencies as Vice President of Engineering & Technology for Zoltek and directing new developments in intermediate carbon fibre products as General Manager of Entec Composite Machines.
Q. Your presentation will evaluate the market for energy storage flywheel applications - how significant an opportunity is this for carbon fibre?
There is a very large opportunity for flywheel energy storage systems in residential homes due to their compact size and very high efficiency. In transportation, KERS or kinetic energy recovery systems that use the moving vehicles braking system to recover kinetic energy have been used in race cars and now are starting to be developed for passenger vehicles. Industrial applications for storage systems in plants for off peak energy production offer significant opportunities for flywheels. The potential cumulative flywheel market over the next 15 years could be well over $65 billion in sales. The global flywheel energy storage market is currently forecasted to grow at a Compound Annual Growth Rate (CAGR) of around 12.35 percent. All these applications provide significant potential for carbon fibre due to the high energy density obtainable as a result of the very high rotation speeds attainable with carbon fibre composite rotors.
Q. What are the drivers for growth in this application, and what are the competing materials?
The biggest drivers are going to be acquisition costs and life time value. The ability of a flywheel to generate energy at higher speeds with less time makes it a reliable and an efficient source of energy with a small environmental footprint. Though they incur higher installation costs, flywheel energy storage systems require minimal maintenance; they run over a long life span (measured in decades) and are environmentally friendly. New developments in flywheel technology have driven energy storage costs to be very competitive with other energy storage methods however, very high efficiency, compact size and immediate response time to energy demands, make flywheel energy storage systems very attractive.
Q. What are the technical challenges for flywheel design and manufacture, and where does carbon fibre have an advantage?
The biggest challenge in designing composite rotors for flywheels is controlling radial stresses. Currently most composite flywheels are designed to enforce compressive stress through the thickness to prevent crack formation and composite failure during operation. The energy density of a flywheel rotor is largely determined by the strength and density of its constituent materials. For this reason, carbon fibre composite flywheels can spin at much higher RPMs than metal flywheels can due to their high strength and low weight. High-speed carbon fibre composite flywheels are a good solution for energy storage applications where high power is required for short durations with limited available space. Glass fibre is an alternative material that can be used for lower rotational speed flywheels and hybrid applications with carbon fibre.
Q. Finally, we are pleased to have you back at the conference again this year, what are you hoping to gain from your participation?
It is always a pleasure to see friends and colleagues and exchange ideas and information. It's a privilege to be a presenter at this GOCarbonFibre conference in Cologne. I look forward to hearing the other presentations and appreciate the opportunity to advance carbon fibre into new markets.
Bill Regan will be presenting "Energy storage flywheel applications - how significant an opportunity is this for carbon fibre?" on Conference day 1 Thursday 9 October |
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Related Exhibition:
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GOCarbonFibre 2014
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17th Annual GOCarbonFibre Conference
10/8/2014 - 10/10/2014
Venue: Hilton Cologne Hotel, Cologne, Germany
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