The exergy destruction during the combustion process decreases and increases as the various features are considered
due primarily to the increase and decrease of the combustion temperatures. Overall, as an example, exergy destruction was about 20.4% and about 24.0% for cases 1 and 5, respectively. The efficiencies were higher for case 5 compared to case 1 even though the exergy destruction during combustion was higher for case 5.