• Line Justesen Pløger
  • Rasheed Fallah
4. term, Energy Engineering, Master (Master Programme)
Proton exchange membrane fuel cells (PEMFC’s) are gaining more popularity as an alternative power source for its simplicity and quick startup. They're commercialized for large number of applications ranging from automotive to stationary e.g powering telecom backup units. One of the problems regarding PEMFC's is the thermal management of the electrochemical reaction resulting in an overheat of the Ballard 1020 ACS air-cooled fuel cell stack at low current densities \SI{0.4}{A \per cm^2}. Researchers in Energy Department at Aalborg University found that the biggest problem in the thermal management is the heat transfer into the air inside the cathode channels. This study aims to solve the problem by placing square and honeycomb turbulence grids before the cathode inlet. The purpose of the turbulence grids is to induce turbulences in the cathode channels and thereby increase the mixing effect in order to improve heat transfer inside the channels. A computational fluid dynamic (CFD) model is build and assisted by experimental work. The CFD results showed an an improvement of the mixing effect in the cathode channels and a reduction of the channel wall temperature is obtained. The experiments have resulted in an increase of the performance by 10.42 %}and 2.75 %}for the square and honeycomb grid respectively.
SpecialisationThermal Energy and Process Engineering
Publication date1 Jun 2018
Number of pages99
ID: 280255186