To understand the effect of fin structure on heat transfer and resistance

numerical simulation and validation experiments were performed on super slit finned tube heat exchangers with different fin pitches Pf and slit heights Sh. When Re was less than 7200

heat transfer and resistance performance was improved with Pf increase. When Re was greater than 7200

heat transfer was improved but resistance was declined with Pf decrease. In case of Sh increase

heat transfer declined first and enhanced later

whereas resistance showed an opposite trend. With regard to five super slit finned tube heat exchangers with different fin structures

the comprehensive flow and heat transfer performance were improved while the actual heat transfer area was decreased with Pf increase

which a consideration of all factors should be required. A good agreement was observed between the numerical simulation and experimental results when Re was in the range of 2734-6712

indicating that the numerical simulation method could predict the heat transfer and resistance characteristics of super slit finned tube heat exchangers. These results would set a basis for optimization between structure and performance of these heat exchangers.