Abstract
A numerical study has been conducted to investigate turbulent mixed-convection air cooling of vertical stacks of heat-generating blocks in a three-dimensional domain simulating a valve hall in a DC/AC converter station. The simulation results include detailed streamline plots of the flow structure, iso-volume plots of the temperature, the magnitude of the net flow in all tower gaps and the maximum temperature in each gap. A parametric study was conducted to explore the effects of geometry and inlet parameters on the cooling effectiveness. These results demonstrate that significant enhancements in the cooling effectiveness can be achieved by simple modifications of the angle of injection of the inlet air jet, the area of the inlet air jet, or the inlet air mass flow rate.
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