Numerical Investigation On The Heat Transfer And Fluid Flow Of Wave-finned Tube And Air-cooled Condenser Unit

Fin tubes,worked as an important part of air-cooled condenser unit, which worked as part of power plant condenser,influent the heat transfer and fluid flow characteristic of condenser much.By study on the distribution of temperature and velocity field,base data can be obtained for engineering use.The air-side heat transfer and fluid flow of flat wave-finned tube are investigated numerically.The air velocity and temperature distributions are obtained at different flow velocities.The results show that the air-side heat transfer and flow characteristic change little when rectangle holes are placed on the fins,and that tri-angle disturbances change the heat transfer coefficient and pressure drop much.(Nu/Nu₀)/(f^1/3/f₀^1/3) is used to precise the flat wave-finned tube.The result indicate that 8-6-0.8 tube is the best when the flow velocity is less than 2.5 m/s,and that 5-10-1.2 is the best when the flow velocity is larger than 2.5 m/s.The flow characteristics and heat transfer characteristics of a condenser unit in direct air-cooled power plant which are influenced by crosswind velocity,platform height,and the crosswind direction are analyzed numerically.The results indicate that crosswind influence the velocity and temperature distribution much.The mass flow rate and effective pressure coefficient decrease,the radiator temperature and the coefficient of hot air recycled increase when the crosswind velocities increase.The effect of platform height is slight.The crosswind in Y way influences the condenser more than the crosswind in X way.The current results can not only provide instructions for the design and optimization of the finned-tubes,but also serve as the reference for designing and operation of direct air-cooled condenser.