Research On Flow And Heat Transfer Of Finned Heat Exchanger Of Direct-Cooled Condenser And Flow Characteristic Of Condenser Unit

The world energy short situation is now more and more serious. Moreover, the energy production is influenced inevitably by economy and environmental protection and so on. The direct-cooled condenser obtained the more and more widespread application in the air cooled power plant system because of its economy, the environmental protection and the good heat transfer performance. In the paper, the numerical simulation of the 3-D coupled convective heat transfer in the finned radiator of direct-cooled condenser was performed systematically, the computed results of heat transfer and pressure drop were analyzed with combination of the experimental data, and the corresponding dimensionless criterion relationship of heat transfer was derived, which was provided with the scientific basis for the engineering design.On the other hand, because of the complexity of the geometrical structure and flow structure and so on, the experiment researches on the direct-cooled condenser interior flow field were very difficult. By employing the numerical simulation, the distribution and variation of thermal parameters such as pressure, temperature, velocity and so on in the direct-cooled condenser can be conducted in detail, on the basis of which, we can optimize the geometry structure, shorten the design period. The effect of different front surface wind velocity, the length of fin on the heat transfer and flow performance of single row condenser, and the effect of the different crosswind velocity, the air blower rotational speed, the ambient temperature, the air blower blade angle of setting on the flow performance of direct-cooled condenser unit were studied. The study results showed that:a. Numerical analysis was used to simulate the coupled convective heat transfer of the finned radiator of direct-cooled condenser, the computed results showed well consistency with the experimental result, which proved that the numerical analysis and method is feasible.b. The numerical computations revealed that heat transfer coefficient and the pressure drop to the air side of finned radiator increase with the front surface velocity increase; Under the same front surface velocity, heat transfer coefficient reduces gradually along with the increase of the fin length, and the pressure drop increases gradually. Based on the analog data regression analysis, the dimensionless heat transfer...