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Vertical ventilation concepts for future passenger Cars

Dehne, Tobias and Lange, Pascal and Volkmann, André and Schmeling, Daniel and Konstantinov, Mikhail and Bosbach, Johannes (2017) Vertical ventilation concepts for future passenger Cars. Building and Environment, 129, pp. 142-153. Elsevier. DOI: 10.1016/j.buildenv.2017.11.024 ISSN 0360-1323

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Official URL: https://doi.org/10.1016/j.buildenv.2017.11.024

Abstract

We compared three vertical ventilation concepts to dashboard ventilation in a generic car cabin with the aim to improve thermal passenger comfort and energy efficiency of future cars. Temperatures were analysed with an infrared camera and local temperature sensors. Omnidirectional velocity probes were used to capture the fluid velocities and temperatures in the vicinity of thermal passenger dummies, which were used to simulate the thermal impact of the passengers. Further, the ventilation efficiency was measured with the tracer gas technique using humidity sensors in the vicinity of the dummies and in the air outlets. Besides the experimental investigations, the relevant flow cases were studied by Computational Fluid Dynamics simulations using the RANS method, providing insight into the complex and three-dimensional flow structures of the passenger compartment. Validation of the simulations with the experimental data revealed acceptable consistency, however, with local deviations indicating further need for experimental investigations. The ventilation efficiencies of the vertical ventilation concepts were at least comparable or even better as compared to dashboard ventilation. Regarding the comfort-relevant flow parameters, dashboard ventilation stood out with the lowest temperature stratification but revealed comfort-critical flow velocities. The vertical ventilation concepts allowed for comfortable velocities, but tended to produce comfort-critical temperature stratifications. Pursuing the equivalent temperatures, the vertical systems revealed an improved heating performance over dashboard ventilation. During summer and spring/fall conditions, low momentum ceiling ventilation as well as the combination of cabin displacement ventilation and low momentum ceiling ventilation were able to provide comfortable equivalent temperature distributions.

Item URL in elib:https://elib.dlr.de/113933/
Document Type:Article
Additional Information:Available online 21 November 2017
Title:Vertical ventilation concepts for future passenger Cars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dehne, Tobiastobias.dehne (at) dlr.deUNSPECIFIED
Lange, PascalPascal.Lange (at) dlr.deUNSPECIFIED
Volkmann, Andréandre.volkmann (at) dlr.deUNSPECIFIED
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Konstantinov, Mikhailmikhail.konstantinov (at) dlr.deUNSPECIFIED
Bosbach, JohannesJohannes.Bosbach (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:Building and Environment
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:129
DOI :10.1016/j.buildenv.2017.11.024
Page Range:pp. 142-153
Publisher:Elsevier
Series Name:Elsevier
ISSN:0360-1323
Status:Published
Keywords:Passenger car ventilation, Thermal passenger comfort, Vertical ventilation, Temperature control efficiency, Equivalent temperature, Computional fluid dynamics
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: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Fluid Systems, GO
Deposited By: Bachmann, Barbara
Deposited On:20 Mar 2018 15:30
Last Modified:06 Sep 2019 15:20

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