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Impact of Turbulence on the Thermal Comfort of Passengers in Car Cabins

Schiepel, Daniel and Westhoff, Andreas (2021) Impact of Turbulence on the Thermal Comfort of Passengers in Car Cabins. In: Roomvent Conference 2020, pp. 522-525. Roomvent 2020, 2021-02-14 - 2021-02-17, Turin, Italien. ISBN 9788894612301.

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Official URL: http://roomvent2020.org/


People spend a considerable amount of their time in vehicles. Hence, thermal comfort is an important argument in terms of the competitive edge. Most studies characterize thermal comfort in car cabins based on EN14505 (ENISO, 2006) originating from the evaluation of thermal comfort for low-velocity ventilation of rooms and buildings. However, the ventilation in cars is typically realized by means of high-momentum air flow through air outlets on the dashboard. In addition, the temperature sensation differs between cars and buildings due to e.g. the activity level or the environment. The aim of this study is to verify the impact of draft on the thermal comfort of passengers. The measurements are performed within a temperature-controlled environment housing a generic single-person car cabin. The latter features two air inlets with adjustable turbulence intensity and an air flow directed at the chest of a thermal manikin (TM) with a heat release of 75 W. The TM’s surface temperature (TS) is recorded by means of infrared (IR) thermometry for various combinations of inlet and ambient temperature, air velocity near the TM’s chest, and low (LT) and high turbulence intensities (HT). Based on (ENISO, 2006), the equivalent temperature (TEQ) of the different body parts is determined as objective criterion and rated accordingly. A sample result for an inlet and ambient temperature of 23°C and a velocity of 1.25 m/s near the chest is depicted in Figure 1 with (A) representing the TS of the TM for LT. TEQ for the LT scenario is shown in (B) and for HT in (C). For LT, significantly higher values for TEQ are obtained compared to HT. Here, the higher turbulence of the jet hitting the TM’s surface leads to an increase in the heat transfer and as a consequence to lower TS. At the conference, we are going to present the impact of draft on the thermal comfort as a function of air velocity, temperature and radiation.

Item URL in elib:https://elib.dlr.de/129369/
Document Type:Conference or Workshop Item (Speech)
Title:Impact of Turbulence on the Thermal Comfort of Passengers in Car Cabins
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schiepel, DanielUNSPECIFIEDhttps://orcid.org/0000-0002-3703-3514UNSPECIFIED
Westhoff, AndreasUNSPECIFIEDhttps://orcid.org/0009-0008-7242-2970UNSPECIFIED
Date:February 2021
Journal or Publication Title:Roomvent Conference 2020
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 522-525
EditorsEmailEditor's ORCID iDORCID Put Code
Series Name:Proceedings
Keywords:passenger comfort, equivalent temperature, cold draft sensibility
Event Title:Roomvent 2020
Event Location:Turin, Italien
Event Type:international Conference
Event Start Date:14 February 2021
Event End Date:17 February 2021
Organizer:Centro Congressi Internazionale srl
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 (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Schiepel, Dr. Daniel
Deposited On:21 Apr 2021 09:54
Last Modified:24 Apr 2024 20:32

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