TurbuGrid is the name of a small plastic grid of approximately 16 x 16 cm that can greatly increase the efficiency of an air-cooled stack of fuel cells. Tests by AAU researchers show an increase in efficiency of at least 33.5 percent, but this can be even greater if the network is added to completely new fuel cells. The increase is due to the fact that the grid adds turbulence to the air that flows into the channels in the stack. Turbulence has a significant effect on the heat transfer that occurs in fuel cells, and this has important implications on how high a power density can be achieved from fuel cells.
We would like the fuel cell to work at approximately 50-60 degrees because the reaction between oxygen and hydrogen has the best conditions at that temperature. So, we need an effective method of transferring the waste heat that is produced inside the fuel cell so that the battery does not overheat, says Torsten Berning, an associate professor in the Department of Energy Technology at Aalborg University.