This paper demonstrates the response of a prototype sCO2 Brayton
cycle under transient operating conditions similar to that experienced
in a typical solar plant with a direct receiver. While the
operating conditions of temperature and pressure for the experiments
are lower than that desired for high-efficiency operation,
this data serves to validate modeling efforts that can be used to
evaluate higher-temperature systems. A discussion of primary
mechanical and thermal losses is provided as well as areas of
advancement required for adoption of sCO2 Brayton turbomachinery
for solar applications.