Optimisation of the underhood flow for improving energy efficiency of BEVs
Research Project, 2022 – 2025

Energy efficient vehicles are essential for a future sustainable society, and today, all car manufacturers work on extending the driving range on their Battery Electrical Vehicles (BEV) through efficient energy
management. Since the available energy in a BEV is limited, it is crucial to minimize all energy losses. With this overall goal, the project main objectives are:
• Propose improvements to the underhood that will result in an increased range extension of 0.5-1.0 %
on the test vehicle in cruising conditions.
• Improve and extend in-house knowledge on the design of front air-intakes, connecting channels and
position of heat exchangers with regards to their impact on drag.
• Design a test vehicle, to be used partly as a reference model, but also to enable tests of innovative
solutions for cooling/heating air flow.
• Use wind tunnel tests for drag estimates in combination with underhood aero and thermal
measurements employing, e.g., laser technology.
• Develop and use advanced CFD methods for coupled aerodynamic and thermal computations.
• Study the influence of diverse flow environment conditions such as cross winds on the cooling and
heating performance of a given design.
• Investigate possibilities of active control solutions through movable flaps and guiding vanes.


Simone Sebben (contact)

Chalmers, Mechanics and Maritime Sciences (M2), Vehicle Engineering and Autonomous Systems


Volvo Cars

Göteborg, Sweden


Swedish Energy Agency

Project ID: 2021-00368
Funding Chalmers participation during 2022–2025

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