Breakthrough in Energy Storage: Isentropic EnergyFeb 23, 2010 - Eric Wesoff - greentechmedia.com Isentropic Energy’s pumped-heat electrical energy storage could disrupt the large-scale electrical energy storage market. It's almost cliche to claim that large-scale energy storage is the holy grail or missing link of renewable energy. (That will not stop me from using that bromide a bit longer, however.) Today, the only economical method of storing energy at a large scale is pumped hydro (pumped hydro accounts for almost all large-scale electricity storage) or Compressed Air Energy Storage (CAES). Unfortunately, both of those technologies require easy access to an immense airtight underground cavern or a couple of large reservoirs. Pumped Heat Electricity Storage The start-up claims that its reversible engine/heat-pump boasts three critical features:
Isentropic's innovations include using aircraft engineering techniques to reduce piston weight and cost, designing new valving to eliminate pressure losses, and using a new sealing technology. The design is intended for "small utility scale." Howes is targeting 2-megawatt 8-hour systems (16MW-hrs), although he claims that the systems can scale up and down. The firm is in the early stage and has built a "proof of ignorance prototype," followed by a technology demonstrator. Design of prototype three is now completed and has been built to demonstrate reliability. Hopefully, this start-up can get the job done and we can finally retire that "energy storage as holy grail" cliche.
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