Numerical investigation of flow deflectors for the improvement of condensing air flux through the air-conditioning unit on high-speed trains

Li, Xueliang; Wu, Fan; Tao, Yu; Yang, Mingzhi; Xu, Renze; Vainchtein, Dmitri

doi:10.1016/j.buildenv.2022.108949

Cited by 8 publications

(1 citation statement)

References 51 publications

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“…The deflector designs made are triangular, right triangle, semi-elliptical and concave. They stated that for the designed triangular, right triangular, semi-elliptical and concave deflectors, the resistance increased by 3.2%, 3.4%, 1.1%, and 5.3%, respectively, compared to the case without the deflector [4]. Gao et al (2019) stated that by attaching a deflector to the duct fittings, it will reduce the resistance and energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Development of Deflector Structure and Effects on Performance: Refrigerated Display Cabinet Application

Öder

Demirpolat

ERDOĞMUŞ

et al. 2022

EJRnD

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Air flow is of great importance in terms of energy efficiency and homogeneity of the cooled package temperatures in open type refrigerated display cabinets (RDCs). Deflectors are critical components for air curtains which are provides air directioning to air channel and grill. A new deflector structure was investigated to increase the performance of the air curtain in this study. Current design deflector structure (Design 1) and new design deflector structure (Design 2) were compared for temperatures of air off-air on and energy consumption parameters. Airflow in the new design deflector structure was tested under Class-3 conditions (25 °C temperature and %60 relative humidity) with ISO 23953-2 2015 standard. According to the results obtained the data compared with the current design deflector structure. The thermal performance has been increased by reducing the temperature of the air off by 1.2 °C on average, the air on temperature by an average of 2.05 °C and the average package temperature by %17.8 with the new deflector design. Cooling performance was increased using new deflector structure with effective airflow between the air off and air on. In addition, thanks to Design 2, the annual energy consumption of RDC has been reduced by 10.17% and accordingly the CO2 emissions released to the environment have been reduced at the same rate.

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Section: Introductionmentioning

confidence: 99%

Development of Deflector Structure and Effects on Performance: Refrigerated Display Cabinet Application

Öder

Demirpolat

ERDOĞMUŞ

et al. 2022

EJRnD

View full text Add to dashboard Cite

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Influence of trains meeting on the ventilation performance of equipment compartment with independent air duct in high-speed train: numerical and experimental study

Wu,

Zhou,

Liang

et al. 2024

Railw. Eng. Sci.

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During the train meeting events, train equipment compartments are exposed to the worst pressure changes, potentially affecting the ventilation performance of equipment, particularly for electrical facilities equipped with independent air ducts. In this paper, a two-step method is used for numerical computation: (1) obtaining the temporal and spatial transient node data of the flow field sections during the train-passing simulation and (2) using the data as the input data for the equipment compartment simulation. In addition, this paper also compares the difference in equipment ventilation between the single-train and train-passing scenarios in real vehicle tests. The results indicate that the primary factors influencing ventilation effectiveness are the aerodynamic compression and deceleration of airflow induced by the other train’s nose, as well as the instability of the external flow field in the wake of the other train. During train crossing, the air is forced into the air duct, with a maximum ratio of the airflow in-duct to the airflow out-duct reaching 3.2. The average mass flow falls below the rated mass flow for the converter. Compared to the rated air volume of converter, the maximum suppression rates obtained from testing and simulation are – 24.5% and – 16.8%, respectively. Compared to the single-train operation, the maximum suppression rates obtained from testing and simulation are – 15% and – 18%, respectively. These findings provide valuable insights into the design and operation of high-speed trains.

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Surrogate modelling of the high-static-pressure fan for high-speed trains and its dynamic airtightness analysis using CFD

Lu,

Wang,

Xiong

et al. 2024

Building and Environment

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Numerical investigation of flow deflectors for the improvement of condensing air flux through the air-conditioning unit on high-speed trains

Cited by 8 publications

References 51 publications

Development of Deflector Structure and Effects on Performance: Refrigerated Display Cabinet Application

Development of Deflector Structure and Effects on Performance: Refrigerated Display Cabinet Application

Influence of trains meeting on the ventilation performance of equipment compartment with independent air duct in high-speed train: numerical and experimental study

Surrogate modelling of the high-static-pressure fan for high-speed trains and its dynamic airtightness analysis using CFD

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