Exergo-economic criteria for performance evaluation of enhanced heat transfer duct with constant wall temperature

Abstract Combining the first and second laws of thermodynamics with the exergo-economic theory, the exergy-economic performance of enhanced duct in comparison with reference smooth duct subjected to constant wall temperature have been examined comprehensively under three design constraints. Extended exergo-economic performance evaluation criteria formulas, i.e., the net profit per unit transferred heat load ( η p ) and the total cost per unit transferred heat load ( η c ) have been obtained from the perspectives of exergy recovery and exergy destruction respectively, accounting for all potential factors such as heat transfer, flow and investment costs. The application of exergo-economic performance evaluation based on η p and η c is illustrated by selecting a spirally corrugated duct as an example. The results for different design constraints show that the exergo-economic performance of enhanced duct is largely determined by Reynolds number ( Re a ) and dimensionless inlet temperature difference ( θ ). There exist critical values of Re a and θ exceeding which η p of enhanced and smooth ducts would be less than zero, showing no engineering significance; however, η c of enhanced and smooth ducts is unconditionally greater than zero due to their specific physical meaning. For all the three design constraints, better exergo-economic performance for enhanced duct can be achieved provided that Re a and θ are in the desirable ranges.

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