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research-article

Air ventilation and comfort in railway vehicles operating in ventilation mode

[+] Author and Article Information
Alfredo Iranzo

Thermal Engineering Group, Energy Engineering Department. School of Engineering, University of Seville, Camino de los Descubrimientos s/n. 41092, Seville, Spain
airanzo@us.es

Antonio Salva

AICIA - Thermal Engineering Group, School of Engineering, Camino de los Descubrimientos s/n, 41092. Seville, Spain, Kelvion Thermal Solutions, S.A.U. B San Juan, 28, 48140 Igorre (Vizcaya), Spain
jsalva@etsi.us.es

Jose Julio Guerra Macho

Thermal Engineering Group, Energy Engineering Department. School of Engineering, University of Seville, Camino de los Descubrimientos s/n. 41092, Seville, Spain
jjguerra@us.es

Gonzalo Barea

Internacional Hispacold S.A., C/ Pino Alepo 1, Polígono Industrial El Pino, 41016 Seville, Spain
gbarea@hispacold.es

Javier Pino

Thermal Engineering Group, Energy Engineering Department. School of Engineering, University of Seville, Camino de los Descubrimientos s/n. 41092, Seville, Spain
fjp@us.es

1Corresponding author.

ASME doi:10.1115/1.4042218 History: Received October 11, 2018; Revised December 03, 2018

Abstract

This paper presents a CFD analysis of the air and temperature distribution in a representative railway vehicle, with the objective of evaluating passengers thermal comfort. The CFD model developed is featuring the wagon geometry in detail including air diffusers geometry, passengers, and luminaires. A set of different scenarios are studied, covering occupancy levels, state of the doors and windows (open/closed), inlet temperature, and air diffuser design. The results show a clear influence of the air supply system and design geometry on comfort, as local velocities well above 1 m/s were obtained for the original design. A new diffuser design proposed clearly improved the velocity field distribution enhancing passengers thermal comfort. Exhaust vents are also presenting high velocities, which are significantly reduced down to 2 m/s when windows are open. It is observed that thermal comfort is not appropriate when air inlet temperature is conditioned to 19 ºC, especially for the original diffuser design.

Copyright (c) 2018 by ASME
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