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On the influence of sensible heat release on displacement ventilation in a train compartment

Schmeling, Daniel and Bosbach, Johannes (2017) On the influence of sensible heat release on displacement ventilation in a train compartment. Building and Environment, 125, pp. 248-260. Elsevier. doi: 10.1016/j.buildenv.2017.08.039. ISSN 0360-1323.

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Official URL: http://dx.doi.org/10.1016/j.buildenv.2017.08.039


The aim of this study is to quantify the influence of heat release on ventilation efficiency and thermal comfort parameters of displacement ventilation in a generic train compartment. A series of human subject studies was conducted for various mean room temperatures. Complementary, measurements using thermal manikins with variable sensible heat release were performed for the same mean room temperatures. Three main findings were achieved: First, values of latent and sensible heat release of human subjects in displacement ventilation are in very good agreement with the standard using T_chest as mean room temperature. Second, the heat removal efficiency (HRE) decreases with increasing mean cabin temperature, that is decreasing sensible heat release, during human subject tests. However, the HRE remains stable during the test with thermal manikins at a constant sensible heat release. Third, we found that variation of the sensible heat has a negligible impact on the flow velocities near the passenger dummies. This indicates that the cooling performance is limited by the rate of fresh air available through the fresh air lake.

Item URL in elib:https://elib.dlr.de/112318/
Document Type:Article
Additional Information:Available online 31 August 2017
Title:On the influence of sensible heat release on displacement ventilation in a train compartment
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Bosbach, Johannesjohannes.bosbach (at) dlr.deUNSPECIFIED
Date:11 May 2017
Journal or Publication Title:Building and Environment
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.buildenv.2017.08.039
Page Range:pp. 248-260
EditorsEmailEditor's ORCID iD
Keywords:sensible heat release; human subjects; thermal manikins; thermal comfort; heat removal efficiency; displacement ventilation
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
Deposited By: Bachmann, Barbara
Deposited On:05 Oct 2017 16:54
Last Modified:05 Nov 2020 19:44

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