70771 20251204145006.0 doi 10.1016/j.applthermaleng.2015.06.003 sideral 90808 ART-2015-90808 eng Barroso, Jorge Universidad de Zaragoza (orcid)0000-0002-0063-1318 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 2015 Access copy available to the general public Unrestricted The 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 m2 K1. 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. info:eu-repo/grantAgreement/ES/MINECO/ENE2012-38642-C02-01 info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 3.043 2015 ENGINEERING, MECHANICAL 7 / 131 = 0.053 2015 Q1 T1 THERMODYNAMICS 6 / 57 = 0.105 2015 Q1 T1 MECHANICS 7 / 135 = 0.052 2015 Q1 T1 ENERGY & FUELS 30 / 88 = 0.341 2015 Q2 T2 1.683 2015 Industrial and Manufacturing Engineering 2015 Q1 Energy Engineering and Power Technology 2015 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Jordi Renau, Jordi Lozano, Antonio Universidad de Zaragoza (orcid)0000-0003-4141-6072 Miralles, José Martín, Jesús Universidad de Zaragoza (orcid)0000-0003-3908-0493 Sánchez, Fernando Barreras, Félix Universidad de Zaragoza (orcid)0000-0002-5391-8021 5001 600 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Mecánica de Fluidos 89 (2015), 1-10 Appl. therm. eng. Applied Thermal Engineering 1359-4311 595272 http://zaguan.unizar.es/record/70771/files/texto_completo.pdf Postprint 75607 http://zaguan.unizar.es/record/70771/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:70771 articulos driver 2025-12-04-14:45:20 ARTICLE