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Hybrid Train Ventilation Systems for Summer and Winter Conditions

Dehne, Tobias and Volkmann, André and Schmeling, Daniel (2021) Hybrid Train Ventilation Systems for Summer and Winter Conditions. In: Roomvent 2020 Conference, pp. 153-156. 15th ROOMVENT VIRTUAL CONFERENCE, 15.-17.02.2021, Turin, Italien (online). ISBN 9788894612301.

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Official URL: http://roomvent2020.org/

Abstract

The HVAC system of a train is the second largest energy consumer during a train journey, requiring up to 20-30% of the total energy demand. Therefore, new technologies, such as heat pumps or demand-oriented ventilation have been tested and integrated [1]. Further, novel ventilation concepts for future high-speed trains have been investigated in recent years in the lower deck of a 1:1 scale generic train mock-up at the DLR in Göttingen within the framework of the Next Generation Train (NGT) project [2]. One main objective of this project is to improve the ventilation system in terms of thermal passenger comfort, heating and cooling performance and energy efficiency. Beside state-of-the-art micro-jet ventilation used as reference case, two novel ceiling-based ventilation concepts were investigated in previous studies: low-momentum ceiling ventilation with a trickle ceiling above the aisle and hatrack-integrated low-momentum ventilation (HLMV) with a trickle ceiling above the seats. In the present study, all three ceiling ventilation concepts were combined with cabin displacement ventilation (CDV), realized by a low-momentum air supply on floor level. The windows of the mock-up were replaced by a jacket heating/cooling system based on capillary tubes mounted on aluminum sheets to allow for the experimental simulation of winter and summer conditions. To simulate the obstructions and the heat release of real passengers, 24 thermal manikins were used. In this study, the influence of warm and cold windows on hybrid ventilation concepts with different air-mass flow distributions between ceiling and floor supply was evaluated in an experimental analysis with regard to the requirements of the standard [3]. At the conference, we are going to present the results in terms of spatial temperature homogeneity, local temperatures and velocities, temperature stratifications, heat removal efficiency as well as surface temperatures of the manikins and cabin interior (see Figure 1) under summer (a) and winter (b) conditions. First results of the present study show a high potential of the novel ventilation concepts with regard to thermal comfort improvements. The lowest energy requirement was observed for the ceiling-based ventilation concepts in case of heating and for CDV in case of cooling. [1] P. Danzer, (2017) ifv Bahn-Klimatechnik (Rail-HVAC) und Bahn-Komfort (Rail-Comfort) Fachtagung. [2] Schmeling D., Hörmann H.-J., (2018) Proceedings of the 4th Int. Conf. on Railways Technology. [3] EN 13129 (2016), Railway Applications; Air Conditioning for Main Line Rolling Stock.

Item URL in elib:https://elib.dlr.de/129225/
Document Type:Conference or Workshop Item (Speech)
Title:Hybrid Train Ventilation Systems for Summer and Winter Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Dehne, TobiasTobias.Dehne (at) dlr.deUNSPECIFIED
Volkmann, AndréAndre.Volkmann (at) dlr.deUNSPECIFIED
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Date:February 2021
Journal or Publication Title:Roomvent 2020 Conference
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 153-156
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDroomventUNSPECIFIED
Series Name:Proceedings
ISBN:9788894612301
Status:Published
Keywords:generic train laboratory, novel ventilation concepts, thermal comfort
Event Title:15th ROOMVENT VIRTUAL CONFERENCE
Event Location:Turin, Italien (online)
Event Type:international Conference
Event Dates:15.-17.02.2021
Organizer:Centro Congressi Internazionale
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Dehne, Tobias
Deposited On:22 Feb 2021 22:29
Last Modified:21 Apr 2021 09:43

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