Published 8 issues per year
ISSN Print: 1065-5131
ISSN Online: 1563-5074
Indexed in
Enhancement to Condensing Heat Transfer-New Developments
ABSTRACT
Most effective fin shapes for enhancing the heat transfer in in-tube, shell-and-tube and plate-fin condensers of refrigerants are discussed using dimensionless expressions for heat transfer coefficients. As for in-tube condensation, micro-fin tubes with trapezoid fins improve the heat transfer coefficient by twice or more as compared with smooth tubes. The enhancement factor of the local heat transfer coefficient and the penalty factor of the frictional resistance are also discussed. Optimally designed low-fin tubes in shell-and-tube condensers ensure ten times or more enhancement of heat transfer coefficients. The local and average Nusselt numbers for a vertical plate-fin condenser with serrated-fins are also presented. The Nusselt numbers are larger than those for plane plate condensers by about ten times.
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