<P> Closed - cycle gas turbines hold promise for use with future high temperature solar power and fusion power generation . </P> <P> They have also been proposed as a technology for use in long - term space exploration . </P> <P> Supercritical carbon dioxide closed - cycle gas turbines are under development; "The main advantage of the supercritical CO cycle is comparable efficiency with the helium Brayton cycle at significantly lower temperature" (550 ° C vs. 850 ° C), but with the disadvantage of higher pressure (20 MPa vs. 8 MPa). </P>

Difference between open cycle gas turbine and closed cycle gas turbine