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Influence of sensible heat release on the performance of displacement ventilation in a train compartment

Schmeling, Daniel und Bosbach, Johannes (2018) Influence of sensible heat release on the performance of displacement ventilation in a train compartment. Roomvent & Ventilation 2018, 2018-06-02 - 2018-06-05, Espoo, Finnland.

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Offizielle URL: https://roomventilation2018.org/

Kurzfassung

It is well known that the human metabolism reacts on different ambient temperatures with a variation of the amount of released sensible and latent heat. However, the impact of this behavior on the performance of ventilation systems and the results of ventilation studies using thermal manikins is not yet investigated and reported in the literature. Accordingly, our aim is to address this issue for a displacement ventilation scenario in a passenger train compartment. Thermal manikins are used, comprising a similar blockage as real human do. A computer controlled system allows for a precise adjustment of the sensible heat released by each manikin. The study was conducted 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 are conducted with human subjects. These are analyzed 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 are evaluated. At the conference, we will present results, comprising that the amounts of sensible and latent heat released by the human subjects fits the standard within the errors, using the temperature on chest level as mean cabin temperature. Astonishingly, the mean flow field is not influenced significantly, which we ascribe to the limited rate of fresh air available through the fresh air lake. The performance of the displacement ventilation system, quantified by the heat removal efficiency as a figure of merit decreases with increasing mean cabin temperature during human subject test, while is stays stable during test with thermal manikins.

elib-URL des Eintrags:https://elib.dlr.de/120282/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Influence of sensible heat release on the performance of displacement ventilation in a train compartment
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974NICHT SPEZIFIZIERT
Bosbach, JohannesJohannes.Bosbach (at) dlr.dehttps://orcid.org/0000-0002-1531-127XNICHT SPEZIFIZIERT
Datum:5 Juni 2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:sensible heat release; human subjects; thermal manikins; displacement ventilation; train compartment
Veranstaltungstitel:Roomvent & Ventilation 2018
Veranstaltungsort:Espoo, Finnland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:2 Juni 2018
Veranstaltungsende:5 Juni 2018
Veranstalter :Scanvac, FiSIAQ, Aalto University
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - Next Generation Train III (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme, GO
Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO
Hinterlegt von: Schmeling, Dr Daniel
Hinterlegt am:13 Jun 2018 15:51
Letzte Änderung:24 Apr 2024 20:24

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