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Influence of Sensible Heat Release on the Performance of Displacement Ventilation in a Train Compartment

Schmeling, Daniel and Bosbach, Johannes (2018) Influence of Sensible Heat Release on the Performance of Displacement Ventilation in a Train Compartment. In: Roomvent & Ventilation 2018, pp. 773-778. SIY Indoor Air Information Oy, Helsinki, Finland. Roomvent & Ventilation 2018, 02.-05. Jun. 2018, Espoo, Finnland. ISBN 978-952-5236-48-4

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Official URL: https://roomventilation2018.org/proceedings/

Abstract

The influence of sensible heat release on the performance of displacement ventilation is studied and analysed in a generic laboratory, representing the lower cabin of the DLR’s next generation train (NGT). In a first step, tests at variable mean cabin temperatures were conducted with human subjects. These tests were analysed in terms of sensible and latent heat release of real humans. In a second step, the cabin was fully equipped with thermal manikins. For different amounts of sensible heat released by the manikins, the large-scale flow fields and the temperatures at selected positions were evaluated. We found that the amounts of sensible and latent heat released by the human subjects complies with the standard EN13129 within the errors, using the temperature on chest level as mean cabin temperature. Astonishingly, the mean local velocities are not influenced significantly, which we ascribe to the limited rate of fresh air available through the fresh air lake. However, the mean velocity fields show significant differences regarding the boundary layer thickness and the observed velocity distribution. Hence, the importance of field measurements to determine comfort-relevant quantities is underlined. The performance of the displacement ventilation system, quantified by the heat removal efficiency as a figure of merit decreased with increasing mean cabin temperature during the human subject test, while it stayed stable during the test with thermal manikins.

Item URL in elib:https://elib.dlr.de/119226/
Document Type:Conference or Workshop Item (Other)
Title:Influence of Sensible Heat Release on the Performance of Displacement Ventilation in a Train Compartment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Bosbach, JohannesJohannes.Bosbach (at) dlr.dehttps://orcid.org/0000-0002-1531-127X
Date:2018
Journal or Publication Title:Roomvent & Ventilation 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 773-778
Editors:
EditorsEmail
Kosonen, RistoUNSPECIFIED
Ahola, MerviUNSPECIFIED
Narvanne, JarkkoUNSPECIFIED
Publisher:SIY Indoor Air Information Oy, Helsinki, Finland
ISBN:978-952-5236-48-4
Status:Published
Keywords:sensible heat release; human subjects; thermal manikins; displacement ventilation; train compartment
Event Title:Roomvent & Ventilation 2018
Event Location:Espoo, Finnland
Event Type:international Conference
Event Dates:02.-05. Jun. 2018
Organizer:Scanvac, FiSIAQ, Aalto University
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 - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Fluid Systems, GO
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Schmeling, Dr Daniel
Deposited On:11 Jun 2018 12:02
Last Modified:11 Jun 2018 12:02

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