There’s news today about another compressed air storage project, called ‘SustainX’. It’s aim is to store energy as compressed air for later use.
From the article:
A key part of SustainX’s approach, Hunt said, is to capture the heat released during compression in a water-foam mixture, then use it to reheat the air when the time comes to use it. They claim their isothermal (unchanged temperature) approach is 95 percent thermally efficient.
You can read the full article here:
And here is their website: http://www.sustainx.com/