This paper aimed to explore the emphasis law of structure parameter on flow and heat transfer characteristics of the direct air-cooling heat exchanger elements and put forward guiding references for optimization design for air-cooling condensers.The thermodynamic performance of single-row-tube direct aircooling heat exchanger elements with different structural parameters was experimentally studied in laboratory scale.The results show that

the heat transfer coefficient and the air resistance increased with the facing velocity.On the premise of the elements structural parameters were basically the same

with a constant facing velocity

the air resistance decreased and the heat transfer coefficient increased with the decreasing fin thickness.Thus

the flow and heat transfer characteristics of the air-cooling elements of single-row-tube and double-row tube were compared.It finds that

within the range of facing velocity that engineering design commonly used

the heat transfer coefficient of the above two types of elements was almost equivalent

while the air resistance of the single-row-tube air-cooling elements was significantly smaller than that of the double-row-tube air-cooling elements.