Air (use the IG model) enters the compressor of an ideal air standard Brayton cycle at 100 kPa, 290 K (atmospheric conditions) and a mass flow rate (m⋅) of 6 kg/s. The compressor pressure ratio is 10. The turbine inlet temperature is 1500 K. A regenerator with an effectiveness of 70% is incorporated in the cycle. If the heat addition can be assumed to take place from a reservoir at 1800 K,
(a) Perform an energy inventory and draw an energy flow diagram for the cycle. Determine (b) The thermal efficiency (ηth,Brayton) and
(c) The exegetic efficiency.
(d) Calculate the rate of energy destruction (I⋅) in the regenerator.
Analysis