Cr and Zr/Cr nitride CAE-PVD coated aluminum bipolar plates for polymer electrolyte membrane fuel cells

Barranco, J.; Barreras, Félix; Lozano, Antonio; López, Ana M.; Roda, Vicente; Martı́n, Jesús; Maza, Mario; Fuentes, G. G.; Almandoz, Eluxka

doi:10.1016/j.ijhydene.2010.05.050

Cited by 74 publications

(25 citation statements)

References 38 publications

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“…In literature, quite a few studies are available on contact resistance properties of metallic BPPs with various coatings. Specifically, TiN [35e41], CrN [23,25,29,31,42e46] and ZrN [47,48] coated stainless steels have been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Contact resistance characteristics of coated metallic bipolar plates for PEM fuel cells – investigations on the effect of manufacturing

Turan¹,

Cora

Koç

2012

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Contact resistance characteristics of coated metallic bipolar plates for PEM fuel cells – investigations on the effect of manufacturing

Turan¹,

Cora

Koç

2012

International Journal of Hydrogen Energy

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“…To reduce the weight of the stack it will be constructed with monopolar aluminum plates, coated with chromium nitride by physical vapor deposition to protect them from corrosion [43,44]. Compared to graphite elements, the use of metallic plates improves the heat transfer process and simplifies the cooling system.…”

Section: Fuel Cell Stackmentioning

confidence: 99%

Experimental determination of the heat transfer coefficient for the optimal design of the cooling system of a PEM fuel cell placed inside the fuselage of an UAV

Barroso

Renau

Lozano

et al. 2015

Applied Thermal Engineering

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h i g h l i g h t sHeat transfer coefficients to refrigerate a HT-PEMFC stack are calculated. Experiments are performed in 2 wind tunnels, for 3 form factors and real conditions. The calculated heat transfer coefficient varies from 8 to 44 W m À2 K À1 . Results at sea level are suitably extrapolated for a target altitude of 10 km. Flow area is optimized as a function of the power required to cool the stack down. a b s t r a c tThe objective of this research is to calculate the heat transfer coefficients needed for the further design of the optimal cooling system of a high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stack that will be incorporated to the powerplant of a light unmanned aerial vehicle (UAV) capable of reaching an altitude of 10,000 m. Experiments are performed in two rectangular tunnels, for three different form factors, in experimental conditions as close as possible to the actual ones in the HT-PEMFC stack. For the calculations, all the relevant thermal processes are considered (i.e., convection and radiation). Different parameters are measured, such as air mass flow rate, inlet and outlet air temperatures, and wall temperatures for bipolar plates and endplates. Different numerical models are fitted revealing the influence of the diverse relevant non-dimensional groups on the Nusselt number. Heat transfer coefficients calculated for the air cooling flow vary from 8 to 44 W m À2 K À1 . Results obtained at sea level are extrapolated for a flight ceiling of 10 km. The flow section is optimized as a function of the power required to cool the stack down to the temperature recommended by the membrane-electrode assembly (MEA) manufacturer using a numerical code specifically developed for this purpose.

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“…To lighten the stack, it will be constructed with monopolar aluminum plates, coated with chromium nitride by physical vapor deposition [9,10]. With these elements, the total stack mass is 3.86 kg.…”

Section: Fuel Cell Stackmentioning

confidence: 99%

Use of fuel cell stacks to achieve high altitudes in light unmanned aerial vehicles

Renau

Lozano

Barroso

et al. 2015

International Journal of Hydrogen Energy

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A study is presented to determine if substituting an internal combustion engine (ICE) by an electric motor powered by a fuel cell stack can be a viable option to increase the service ceiling of an available light unmanned aerial vehicle (UAV), extending it to 10,000 m. As a first condition, the stack has to be capable of supplying the minimum power required for horizontal leveled flight at this altitude, which is a function of the UAV total mass. A second step examines if the UAV can transport the energy required to reach the desired service ceiling without exceeding the maximum mass that can be loaded, considering that both hydrogen and oxygen have to be carried on-board. A particularly light PEM fuel cell stack is proposed as a suitable power source. A realistic system is described to store the required amount of reactant gases maintaining the mass below the allowable limits. Results indicate that with its aerodynamic characteristics, the UAV should be capable of ascending up to 10,000 m with the described fuel cell and gas storage system. Some multivariable maps that include service ceiling, total payload and required power are provided to perform this type of analysis.Keywords: PEM fuel cell, Hydrogen, High-temperature, UAV, Aerodynamics * Corresponding author. E-Mail: alozano@litec.csic.es Nomenclature Latin alphabet

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Cr and Zr/Cr nitride CAE-PVD coated aluminum bipolar plates for polymer electrolyte membrane fuel cells

Cited by 74 publications

References 38 publications

Contact resistance characteristics of coated metallic bipolar plates for PEM fuel cells – investigations on the effect of manufacturing

Contact resistance characteristics of coated metallic bipolar plates for PEM fuel cells – investigations on the effect of manufacturing

Experimental determination of the heat transfer coefficient for the optimal design of the cooling system of a PEM fuel cell placed inside the fuselage of an UAV

Use of fuel cell stacks to achieve high altitudes in light unmanned aerial vehicles

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