Parametric Investigation Using Computational Fluid Dynamics of the HVAC Air Distribution in a Railway Vehicle for Representative Weather and Operating Conditions

Suárez, Christian; Iranzo, Alfredo; Salva, J. Antonio; Tapia, Elvira; Barea, Gonzalo; Guerra, José

doi:10.3390/en10081074

Cited by 18 publications

(14 citation statements)

References 14 publications

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“…The air inlet was located in the ceiling. Numerical simulations were made for dif-ferent vehicles by researchers, for example, Suárez [8] studied air distribution in trams and Bosbach [9] compared six different ventilation concepts (mixing ventilation, cabin displacement ventilation, ceiling based displacement as well as combined ceiling and floor-based displacement ventilation for the aircraft cabin. Due to the application of CFD, it was possible to simulate the distribution of air parameters in vehicles and also better optimization of the ventilation for subway side-platforms in Tianjin Metro.…”

Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N mentioning

confidence: 99%

Modelling of the Airflow in the Passenger Coach

Sarna¹,

Palmowska

2019

Architecture, Civil Engineering, Environment

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In this paper currents requirements of HVAC designing (Heating, Ventilation and Air Conditioning) in railway vehicles have been presented. The data were based on railway standards [1, 2]. The aim of this study was to carry out the numerical calculation of airflow combined with heat exchange in a passenger coach. ANSYS CFX 12.1 software was used to carry out the simulation. Two cases of boundary conditions were considered, the first obtained from design calculations common for ordinary buildings and information included in standards and the second only based on the information included in standards. After analysing of the results, it was found that the distribution of air velocity in a coach was similar in both cases, average air velocity was 0.79 m/s. However, the distribution of air temperature was different. For case 1 the average indoor air temperature was 25.07°C and for case 2 was 23.53°C. The method of determining the heat solar gains had a great impact on the results. A further possibility of a model improvement was indicated for example human models will be introduced in coaches, in order to verify the conditions of their thermal comfort, and air recirculation.

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Section: A R C H I T E C T U R E C I V I L E N G I N E E R I N G E N mentioning

confidence: 99%

Modelling of the Airflow in the Passenger Coach

Sarna¹,

Palmowska

2019

Architecture, Civil Engineering, Environment

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“…The air quality and the thermal comfort in various passenger vehicles were the subject of a number of studies in literature [1][2][3][4]. The thermal comfort in tramcars or railway systems received relatively less attention in the existing literature [5,6].…”

Section: Introductionmentioning

confidence: 99%

Air Ventilation and Thermal Comfort in a Tramcar

Demir¹,

Angeneh²,

Aktas³

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

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In the present study, heating, ventilation and air conditioning (HVAC) vents of a tramcar passenger cabin were designed by utilizing computational fluid dynamics (CFD) analysis. Three dimensional and transient numerical simulations were performed in order to obtain the flow and the temperature fields in the cabin. The time dependent Navier Stokes and energy equations for turbulent flow conditions were solved by a commercial CFD package (ANSYS Fluent). The obtained temperature distribution and the air circulation velocity in the cabin comply with the EN 14750-1 standard for both cooling and heating modes of the air conditioning unit. The proposed vent design provides an improved thermal comfort compared to the existing vent structure in the tramcar.

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“…To estimate the PMV and mPMV values, the temperature, mean radiant temperature, and velocity of the air are obtained from simulation results. The metabolic activities [23,24] of 1.4 met, 1 met, and 0.7 met [25] are assigned to the driver, passenger, and baby, respectively, which correspond to 80 W/m 2 , 58.2 W/m 2 , and 45 W/m 2 [26], respectively, and the corresponding MAP value is estimated using Equation (4). The external work value is specified as zero.…”

Section: Comfort Predictionsmentioning

confidence: 99%

“…Fišer and Jícha [3] designed the most suitable air distribution system for an aircraft cabin in order to obtain an improved quality of ventilation for the enriched thermal comfort of passengers based on the local mean age of the air using computational fluid dynamics (CFD) software. Suárez et al [4] studied the air distribution for eight different scenarios in a railway cabin for a European environment using ANSYS-CFX, as it is challenging and costly to achieve precise results under realistic thermo-fluid conditions. The ventilation system for the thermal comfort and quality of air in public transport buses was evaluated by Zhu [5] by using a real-time continuous monitoring system.…”

Section: Introductionmentioning

confidence: 99%

Human Thermal Comfort and Heat Removal Efficiency for Ventilation Variants in Passenger Cars

Khatoon

Kim

2017

Energies

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Abstract:The realization of a comfortable thermal environment with low energy consumption and improved ventilation in a car has become the aim of manufacturers in recent decades. Novel ventilation concepts with more flexible cabin usage and layouts are appealing owing to their potential for improving passenger comfort and driving power. In this study, three variant ventilation concepts are investigated and their performance is compared with respect to energy efficiency and human comfort of the driver and passenger in front and a child in the rear compartment. FLUENT 16.0, a commercial three-dimensional (3D) software, are used for the simulation. A surface-to-surface radiation model is applied under transient conditions for a car parked in summer conditions with its engine in the running condition. The results for the standard Fanger's model and modified Fanger's model are analyzed, discussed, and compared for the driver, passenger, and child. The modified Fanger's model determines the thermal sensation on the basis of mean arterial pressure.

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Parametric Investigation Using Computational Fluid Dynamics of the HVAC Air Distribution in a Railway Vehicle for Representative Weather and Operating Conditions

Cited by 18 publications

References 14 publications

Modelling of the Airflow in the Passenger Coach

Modelling of the Airflow in the Passenger Coach

Air Ventilation and Thermal Comfort in a Tramcar

Human Thermal Comfort and Heat Removal Efficiency for Ventilation Variants in Passenger Cars

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