A diagram of Sandia National Laboratories’ simple closed-loop Brayton cycle test loop. The working fluid being compressed, heated and expanded to produce power is supercritical carbon dioxide.

KIER's new technology relies on something called the "reverse-Brayton cycle," which uses air to compress a gas into a low-temperature gas. "Due to environmental regulations, refrigeration systems ...

During the charging cycle, most of the cylinders operate as argon compressors at a peak pressure of 200 bar and, in the discharging cycle, they act as expanders by returning pressure energy back ...