首页|Airside thermal-hydraulic and fouling performances of economizers with integrally-molded spiral finned tubes for residual heat recovery
Airside thermal-hydraulic and fouling performances of economizers with integrally-molded spiral finned tubes for residual heat recovery
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NSTL
Elsevier
Without defects inherent in conventional welded finned tubes， nonwelded integrally-molded spiral finned (IMSF) tubes proposed here have “zero” contact thermal resistance and high joint strength out of trapezoidal cross-section of the fin， and thus greatly improve thermal performances and service life of economizers for residual heat recovery。 To guide the applications of this new economizer， a three-dimensional physical-numerical model is established to study airside thermal-hydraulic and fouling performances of the economizer with IMSF-tubes。 We investigate the effects of longitudinal and transverse pitches of finned tube bundles on the airside thermal-hydraulic and fouling performances of IMSF-tubes at various Reynolds numbers。 The results show that a longitudinal pitch more than 80 mm is suggested for economizer design to avoid working instability of boiler systems due to high pressure drop at small longitudinal pitch， and as compromised， a transverse pitch of an economizer may be more than 100 mm since a small transverse pitch improves thermal-hydraulic performance， but worsens fouling and raises pressure drop。 We also put forward new correlations of the Colburn and Fanning friction factors for the IMSF-tube economizer。 Compared with other finned tubes， IMSF-tubes improve not only mechanics but also thermal-hydraulic performances of heat exchangers。 Our research work may contribute to applications of IMSF-tube economizers for residual heat recovery。
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO2 Utilization and Reduction Technology Department of Energy and Power Engineering Tsinghua University
School of Low-carbon Energy and Power Engineering China University of Mining and Technology
NSTL
Elsevier
