Supercritical closed Brayton power cycles using carbon

Chapter 9, Problem 9.11D

(choose chapter or problem)

Supercritical closed Brayton power cycles using carbon dioxide as the working substance currently are under active consideration. Figure P9.11D provides the schematic of such a cycle and an accompanying T–s diagram with state data. In this cycle the main flow is split at state 8 and merged at state 3 after two stages of compression. The fractions of the total flow at various locations are indicated in parentheses on the figure as (1), (y), and (1 - y). If the cycle develops net work at a rate of 85.5 kJ per kg of carbon dioxide flowing through the turbine, determine the thermal efficiency, back work ratio, isentropic efficiency of each compressor stage, and isentropic turbine efficiency. Also conduct an Internet search for important applications of supercritical closed Brayton power cycles using carbon dioxide. Prepare a poster presentation of your findings suitable for your class in thermodynamics.