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Improving driving range for FCEVs by use of an innovative metal hydride air-conditioning system

Pöhl, Joshua and Wimmer, Alexander and Bürger, Inga and Kordel, Markus and Heckert, Florian (2021) Improving driving range for FCEVs by use of an innovative metal hydride air-conditioning system. World Hydrogen Technology Convention, 20. - 24.06.2021, online.

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Driving range of alternative powered vehicles, such as fuel cell electric vehicles (FCEV), became a core requirement and an unneglectable selling argument. Besides the energy efficiency of the powertrain itself and the body specifications, such as weight and air resistance factor, the auxiliaries need to be focused to extend vehicle range. As cooling and heating the cabin is one of the main energy consumers this presentation will elaborate an innovative concept to support or even substitute the vehicles conventional air-conditioning. The system is based on the reversible reaction of metal hydrides (MH) with hydrogen and uses the pressure difference between a high-pressure hydrogen tank and the fuel cell to provide heat and cold without producing water. So, without changing the chemical state of the hydrogen. Based on an existing lab-scale prototype, a mathematical model was validated and been implemented into the simulation platform 'KULI'. This contribution discusses the integration strategy of such a metal hydride air conditioning system into a FCEV and elaborates its impact on energy consumption and corresponding driving range in numerical simulations. Integrating a coolant to air heat exchanger into the HVAC box allows using both cold coolant from desorption side of the MH-reactor in summer and hot coolant from the absorption side in winter. Our results demonstrate significant energy saving potentials by reducing the utilization of electric climate compressor and electric PTC heater. Simulations also show that these benefits are not achieved by reducing passenger comfort, but instead both cool-down and warm-up times are even reduced.

Item URL in elib:https://elib.dlr.de/142943/
Document Type:Conference or Workshop Item (Speech)
Title:Improving driving range for FCEVs by use of an innovative metal hydride air-conditioning system
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Pöhl, JoshuaJoshua.Poehl (at) magna.comUNSPECIFIED
Wimmer, AlexanderAlexander.Wimmer (at) dlr.deUNSPECIFIED
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Kordel, MarkusMarkus.Kordel (at) dlr.deUNSPECIFIED
Heckert, FlorianFlorian.Heckert (at) dlr.deUNSPECIFIED
Date:22 June 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:metal hydride, efficiency, fuel cell electric vehicle, driving range, thermal management simulation, Magna, KULI software
Event Title:World Hydrogen Technology Convention
Event Location:online
Event Type:international Conference
Event Dates:20. - 24.06.2021
Organizer:Peter Sauber Agentur Messen und Kongresse GmbH
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Institute of Vehicle Concepts > Vehicle Energy Concepts
Deposited By: Wimmer, Alexander
Deposited On:20 Jul 2021 15:28
Last Modified:20 Jul 2021 15:28

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