Nowadays, the main goal of all modern heat exchangers is to increase performance and reduce costs. In typical applications such as Cooling Towers, Air Cooled Condensers and Process Air Coolers, axial fans play a key role in achieving these targets. As an example, recent Directive 2009/125/EC has defined a list of minimum efficiency requirements for each fan type. As a consequence, the improvement of fan efficiency and corresponding reduction in power consumption become the most important parameters in new airfoil development and solutions that can satisfy these requirements. Extensive research, the application of aerodynamic concepts to fan blades through Computational Fluid Dynamic analysis (CFD simulation) and laboratory tests have resulted in the development of a new innovative design: the Tandem Blade. Scope of the present study is to examine aerodynamic concepts which determine fan blade efficiency and then show how a new design can lead to improved fan performance by increasing lift and reducing vortexes generated by the blade.
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