Examples, Brayton cycle with reheat, intercooling, and regeneration

Brayton cycle with reheat and intercooling only

1.  
2. w_comp,1=117 kJ/kg,w_comp,2=117 kJ/kg, q_intercool=117 kJ/kg
3. w_turb,1=374 kJ/kg,w_turb,2=374 kJ/kg, q_reheat=374 kJ/kg
4. η=38.1%! It has gone down from original cycle! (Note that q_in is both q_in to high pressure heat exchanger [979 kJ/kg] and q_reheat)

Brayton cycle with reheat, intercooling and ideal regneration

1.  
2. w_comp,1=117 kJ/kg,w_comp,2=117 kJ/kg, q_intercool=117 kJ/kg
3. w_turb,1=374 kJ/kg,w_turb,2=374 kJ/kg, q_reheat=374 kJ/kg
4. η=68.9%! It has gone way, way up! (Note that q_in is both q_in to high pressure heat exchanger and q_reheat as before, but now with the regeneration q_in to high pressure heat exchanger is only 374 kJ/kg too!)