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Compressed Air Approach for Wind
are developing a localized compressed air approach for
storing excess energy from off-shore wind turbines to
dramatically alleviate power supply and demand imbalances
during the day. This will also make availability of wind
energy more reliable, predictable and less disruptive to the
In our approach, energy is stored prior to electricity generation in high pressure compressed air vessel, and an efficient compressor/expander with enhanced heat transfer that operates nearly isothermally is used directly for energy storage and extraction. This approach avoids losses associated with multiple conversions and allows the electrical generator and the transmission lines to be substantially down-sized. An open accumulator configuration is used to maintain system pressure so that efficiency and power density can be maintained regardless of how much compressed air is present in the accumulator. A hybrid hydraulic-pneumatic power transmission and storage approach to achieve high power density, high energy density and control functions.
This project is a multi-disciplinary collaboration between the University of Minnesota, the University of Virginia, and Lightsail Energy Inc.
* A video introduction
* A one-page project overview is here.
* A two-page project overview is here
* An even longer project overview is here.
- Mohsen Saadat presented the paper, "Combined Optimal Design and Control of A Near-Isothermal Liquid Piston Air Compressor/Expander for a Compressed Air Energy Storage (CAES) System for Wind Turbines" at the 2015 ASME Dynamic Systems and Control Conference (DSCC) in Columbus, OH. The paper was selected as one of 3 finalists for the Best Energy Systems papers presented at the conference. Congratulations, Mohsen.
- Doctoral student Mohsen Saadat won 2nd prize ($2500) for the Dow Sustainability Innovation Student Challenge Award (SISCA).
- Bo Yan (ME, UMN) successfully passed his M.S. defense. Congratulations, Bo. He will be working at Cummins in Indiana.
- NSF EFRI Grantee conference 3.8.2012 was held in Arlington VA where we presented a poster.
- All hands workshop 3.9.2012 was held at the University of Virginia, Charlotteville, VA. Thirteen of the team attended. Here are some photos (Pict1, Picts2)
- We had a successful all-hands workshop on November, 11, 2011 at the University of Minnesota. About 20 investigators, researchers and students attended.
- Andrew Rice graduated with his M.S. Congratulations.
- Andrew Rice presented a paper entitled: Optimal Efficiency-Power Tradeoff for an Air Motor/Compressor with Volume Varying Heat Transfer Capability" at the Joint 2011 ASME DSCC and Bath Symposium on PTMC.
- Prof. J. Van de Ven and student Shawn Willheim joined the University of Minnesota. Welcome Jim and Shawn!
- Perry Li, Eric Loth, Moshen Saadat, Chao Zhang and Chri QIn attended the 2011 NSF-EFRI Grantee Meeting in Arlington, VA.
- NSF-EFRI Project kick off meeting at Lightsail Energy, Oakland, CA. The project PIs together with Andrew Rice (UMN) and Shawn Willheim (WPI) attended.
- Our team is one of the four awardees (out of 84 entries) for the NSF EFRI-RESTOR awards. See the press release.
Funding:The project is funded by the National Science Foundation's Emerging Frontier in Research and Innovation Program (NSF-EFRI #1038294) under the 2010 topic of Renewable Energy Storage (RESTOR); the University of Minnesota's Institute of Renewable Energy and the Environment (IREE Grant# RE-0027-11); and the NSF Center for Compact and Efficient Fluid Power (CCEFP).
|Contacts: Prof. Perry Y. Li
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