AVOIDABLE AND UNAVOIDABLE EXERGY DESTRUCTIONS AND THE ASSOCIATED INVESTMENT COST FOR EVALUATING THE PERFORMANCE OF A GAS TURBINE CYCLE
Keywords:
KEYWORDS: Thermoeconomic; exergoeconomic factor, effectiveness, avoidable exergy destruction; unavoidable exergy destructionAbstract
ABSTRACT
The objective of the current work is to provide a deeper awareness about the thermodynamic performance and cost effectiveness of thermal systems. To seek the potential for improvement, the avoidable part of the exergy destruction and the avoidable investment cost must be identified. The exergy destruction and the associated investment cost are split into avoidable and unavoidable parts. Modified exergatic efficiency (effectiveness) and a modified exergoeconomic factor are introduced and compared with the corresponding conventional effectiveness and exergoeconomic factor.
A simple gas turbine cycle is taken as an example to explore the advantages of such approach to give a rational judgment of the performance of thermal systems. The results show that, for the whole plant the conventional exergoeconomic factor is calculated as 16.15% and the conventional effectiveness as 24.67%, while the modified exergoeconomic factor is calculated as 36.85%, and the modified effectiveness as 40.14%.
