THERMODYNAMIC OPTIMIZATION OF TUBULAR HEAT EXCHANGERS BASED ON MINIMUM IRREVERSIBILITY CRITERIA

Autor/autori: As. drd. ing. Adina GHEORGHIAN, Prof. dr. ing. Alexandru DOBROVICESCU, As. drd. ing. Andreea MARIN, S.l. dr. ing. Claudia IONITA

Abstract: Forced convection heat transfer inside circular tubes was analyzed having as starting pointthe equation of entropy generation per unit volume. The entropy generation function profile was derived assuming Poiseuille flow conditions and considering velocity and temperature profiles. It was shown that this can be expressed as a sum of two terms: heat transfer across finite temperature differences and viscos flow within tubes. A nondimensional form of entropy generation function was developed expressing the local entropy generation number per unit volume. Entropy generation rate per unit length was determined by integration across tube length. Finally, an expression of optimum tube diameter was determined based on minimum irreversibility criteria

Keywords: Entropy generation; Thermodynamic optimization; Tubular heat exchanger, Minimum irreversibility criteria.

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