Brayton cycle turbine

https://www.youtube.com/watch?v=qj7m-sZRiaA http://www.jlankatech.com uses brayton cycle turbines. Ambient pressure, only air, no salts or batteries for backup. firebrick as thermal storage. http://www.traditionaloven.com/articles/84/firebricks-heavy-dense-fire-clay-bricks  (20min). http://www.dlr.de/vt/en/desktopdefault.aspx/tabid-5136 ,  https://foresternetwork.com/daily/energy/distributed-generation/microturbine-manufacturers-outline-the-benefits-of-distributed-energy/