Air enters the compressor of a regenerative gas turbine engine at 100 kPa and 290 K, where

Question:

Air enters the compressor of a regenerative gas turbine engine at 100 kPa and 290 K, where it is compressed to 750 kPa and 550 K. The regenerator has an effectiveness of 70%, and the air enters the turbine at 1200 K. For a turbine efficiency of 80%, determine
(a) The amount of heat transfer (q) in the regenerator and
(b) The thermal efficiency (ηth) of the cycle. Assume variable specific heats of air.