Numerical Investigation of Airflow Patterns and Thermal Comfort in a Bus Cabin

Hossam, Mohamed; Fouad, Mahmoud; Abou-Zaid, Ahmed

doi:10.4271/06-13-02-0012

Cited by 4 publications

(14 citation statements)

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“…Overall, according to the tendency line (line in black) in Figure 2's graph, there has been a growing tendency in the number of publications over the years. This biased growth was driven after the year 2007 due to the increase in the number of publications per year, which increased from one to two articles on average and especially the years 2015 [19,31,50,51] and 2020 [9,11,13,48] stand out with four publications each. Therefore, it is noticeable that researchers in this knowledge area have been directing more attention to this environment, and that the significance of conducting thermal analyses in bus cabins has been growing.…”

Section: Bibliometric Resultsmentioning

confidence: 99%

Section: Bibliometric Resultsmentioning

confidence: 99%

“…The year 2020 had the same performance as 2015 with four publications [9,11,13,48]. Hossam, Fouad, and Abou-Zaid [9] used computational fluid dynamics (CFD) and the PMV-PPD model to investigate three particular cases. In the first, the conditioning system vents in the buses were varied at four angles (0 • , 15 • , 30 • , and 45 • ), in the second case, the authors chose the best vent angles and changed the air speed in two stages (from 1 to 2 m/s and from 2 to 3 m/s), and the third investigated an air conditioning system in which the outlet was rectangular and fixed without the possibility of angulation.…”

Section: Bibliometric Resultsmentioning

confidence: 99%

“…As a result, the authors inferred that the passengers were in an environment with poor air quality due to ozone from the outside air and were thermally uncomfortable due to the high temperature. According to the authors, the effect of this thermal discomfort can be minimized by adjusting the system's vents to an angle of 30 • , the same angle recommended in the study by Hossam, Fouad, and Abou-Zaid [9].…”

Section: Bibliometric Resultsmentioning

confidence: 99%

“…In bus cabins, thermal comfort has been regarded as one of the most significant factors for the passengers' comfort level [9,10]. Due to high temperatures, the level perceived by the passengers was considered unsatisfactory and described in a field study conducted on buses with air conditioning during the night in China [11].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Review of Thermal Comfort Applied in Bus Cabin Environments

2020

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As of 2020, it has been 50 years since the publication of Fanger’s predictive model of thermal comfort that was designed for indoor environments and attention worldwide is directed at the COVID-19 pandemic and discussions around recommendations for these indoor environments. In this context, many environments and their occupants will suffer consequences related to thermal comfort due to the necessary indoor air changes. In bus cabins, the impact might be even greater, seeing that they are responsible for the mass transportation of people. Thus, this paper intends to review the studies on thermal comfort that analyzed bus cabin environments. It adapts the PRISMA methodology and, as a result, it includes 22 research papers published in journals. Among those, 73% focused on approaching the occupants’ thermal sensation, followed by fuel/energy economy (18%), and driver productivity (9%). The current state-of-the-art indicates that air temperature and air velocity were the parameters most employed by the included studies, but eight papers analyzed all six parameters of the standard models of thermal comfort. The most employed model of thermal comfort was Fanger’s, but there has not been an investigation that assesses its consistency in predicting the occupants’ thermal sensation in the explored environment. Nevertheless, the analyzed studies recommended constant air change inside closed buses or keeping them open to minimize adverse effects on the occupants’ health, especially due to airborne diseases and CO2 concentration possibly being a suitable indicator to identify the need for air change.

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Section: Bibliometric Resultsmentioning

confidence: 99%

Section: Bibliometric Resultsmentioning

confidence: 99%

Section: Bibliometric Resultsmentioning

confidence: 99%

Section: Bibliometric Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Review of Thermal Comfort Applied in Bus Cabin Environments

2020

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A Field Survey on Indoor Climate in Land Transport Cabins of Buses and Trains

Ogundiran,

Nyembwe,

Ribeiro

et al. 2024

Atmosphere

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Assessing indoor environmental quality (IEQ) is fundamental to ensuring health, well-being, and safety. A particular type of indoor compartment, land transport cabins (LTCs), specifically those of trains and buses, was surveyed. The global rise in commute and in-cabin exposure time gives relevance to the current study. This study discusses indoor climate (IC) in LTCs to emphasize the risk to the well-being and comfort of exposed occupants linked to poor IEQ, using objective assessment and a communication method following recommendations of the CEN-EN16798-1 standard. The measurement campaign was carried out on 36 trips of real-time travel on 15 buses and 21 trains, mainly in the EU region. Although the measured operative temperature, relative humidity, CO2, and VOC levels followed EN16798-1 requirements in most cabins, compliance gaps were found in the indoor climate of these LTCs as per ventilation requirements. Also, the PMV-PPD index evaluated in two indoor velocity ranges of 0.1 and 0.3 m/s showed that 39% and 56% of the cabins, respectively, were thermally inadequate. Also, ventilation parameters showed that indoor air quality (IAQ) was defective in 83% of the studied LTCs. Therefore, gaps exist concerning the IC of the studied LTCs, suggesting potential risks to well-being and comfort and the need for improved compliance with the IEQ and ventilation criteria of EN16798-1.

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Field Measurement of Air Velocity and Temperature Factors that Influence the Thermal Comfort in Shuttle Bus

Yunus

Salleh²,

Rahim³

et al. 2023

ARFMTS

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Good public transportation that can offer a pleasant peaceful and relaxing environment is necessary for improving people's interest in using it. Thermal comfort is determined in this study by measuring the air velocity and temperature of the air-conditioning from the outlet. Both data are taken using a digital anemometer and thermocouple with three replications for reproducibility. For data collection, a 10-row shuttle bus was held immobile for 30 minutes. According to the data, outlet 5 received the highest air velocity and the lowest temperature, at 9.12 ms-1 and 13.6 °C, respectively. It was also discovered that the design of the air-conditioning ducting impacts the reachability of cooled air to the farthest outlets, adversely affecting the target cool temperature and passenger comfortability. It is suggested that in order to promote the attractiveness of public transportation, the inner bus compartment and air-conditioning system in hot countries should prioritise thermal comfort.

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Numerical Investigation of Airflow Patterns and Thermal Comfort in a Bus Cabin

Cited by 4 publications

References 0 publications

A Review of Thermal Comfort Applied in Bus Cabin Environments

A Review of Thermal Comfort Applied in Bus Cabin Environments

A Field Survey on Indoor Climate in Land Transport Cabins of Buses and Trains

Field Measurement of Air Velocity and Temperature Factors that Influence the Thermal Comfort in Shuttle Bus

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