Exergy and exergoeconomic analysis of a shell and spirally coiled tube heat exchanger based on coupled CFD and thermodynamic simulations

Autor: Salar Zeinali, Elaheh Neshat
Rok vydání: 2021
Předmět:
Zdroj: Journal of Thermal Analysis and Calorimetry. 147:7899-7915
ISSN: 1588-2926
1388-6150
DOI: 10.1007/s10973-021-11069-7
Popis: In this study, exergy and exergoeconomic analysis of a shell and spirally coiled tube heat exchanger is presented. The realizable k–e turbulent model is used to numerically evaluate the primary sources of the irreversibility in the shell and spirally coiled tube heat exchangers. The accuracy of the employed numerical solution is validated by the previously published experimental and theoretical studies. The effects of the non-dimensional temperature difference ratio ( $$R_{{\text{T}}}$$ ) and mass flow ratio ( $$R_{{\text{m}}}$$ ) (defined as the ratio of the tube-side mass flow rate to the shell side one) on the exergy efficiency, the total irreversibility, the ratio of the irreversibility to the heat transfer rate, and purchased equipment cost (PEC) are investigated. It is found that the exergetic performance is more sensitive to the variation in the inlet temperature of the shell side rather than to the inlet temperature of the tube-side. Also, with the rise of the mass flow ratio, the irreversibility rate decreases while the exergy efficiency increases. The trend of increase in the exergy efficiency with the mass flow ratios within 1–2 was more severe. Moreover, the obtained results indicated that the PEC value is affected mainly by $$R_{{\text{m}}}$$ compared to $$R_{{\text{T}}}$$ .
Databáze: OpenAIRE
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