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Preheating fuel cells at -20°C with metal hydrides using the pressure difference between tank and stack

Dieterich, Mila and Bürger, Inga and Linder, Marc Philipp (2017) Preheating fuel cells at -20°C with metal hydrides using the pressure difference between tank and stack. World Hydrogen Technology Conference (WHTC) 2017, 9.-12.7.17, Prag, Tschechien.

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*: mila.dieterich@dlr.de Fuel cells in vehicles have to be preheated in winter in order to expand service time and prevent ice formation. Metal hydrides can be used as solution to this challenge, as they can transform the pressure difference between hydrogen tank and fuel cell into heat. Until now, this potential energy stored in the high pressure hydrogen is throttled and lost. The working principle of a metal hydride pre-heater is the following: absorption of hydrogen at higher pressure into a metal hydride produces heat even at low ambient temperatures to preheat the fuel cell. Then, the lower pressure level of the fuel cell as well as waste heat enable desorption of the hydrogen from the metal hydride and the conversion in the fuel cell into electricity. At our institute a reactor designed to investigate the preheating application for fuel cell vehicles was developed. LaNi4.85Al0.15 was used as heat producing material inside a tube bundle heat exchanger to reach high thermal power. Vehicle temperature conditions were simulated via a thermostatic bath considering a thermal regeneration at 130°C against ambient pressure. Hydrogen was provided to the material in a temperature range between -20 and 20°C and a pressure range between 1 and 10 bar, and the thermal power transferred into the heat transfer fluid was measured. The study could verify high thermal power of metal hydrides at low ambient temperature suitable for automotive applications. The experiments showed that the 960 g of material could transfer a thermal power of up to 5 kWpeak at -20°C into the heat transfer fluid. Different influence factors on the thermal power were investigated, such as ambient temperature, hydrogen pressure and mass flow rate of the heat transfer fluid. The biggest influence on the thermal power showed the hydrogen pressure as can be seen in Figure 1.

Item URL in elib:https://elib.dlr.de/113251/
Document Type:Conference or Workshop Item (Speech)
Title:Preheating fuel cells at -20°C with metal hydrides using the pressure difference between tank and stack
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Dieterich, MilaMila.Dieterich (at) dlr.deUNSPECIFIED
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Date:17 July 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:metal Hydride, high thermal power, preheating, vehicle
Event Title:World Hydrogen Technology Conference (WHTC) 2017
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:9.-12.7.17
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Energiemanagement (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Dieterich, Mila
Deposited On:17 Jul 2017 11:17
Last Modified:31 Jul 2019 20:10

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