Evaluation of Cabin Comfort in Air Conditioned Buses Using CFD

Pawar, Sandip; Gade, Upender Rao; Dixit, Atish; Tadigadapa, Srinivas; Jaybhay, Sambhaji

doi:10.4271/2014-01-0699

Cited by 11 publications

(17 citation statements)

References 7 publications

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“…Moreover, CFD tools can also be utilized in assessing the vehicle cabin thermal comfort for the occupants. Sandip et al [2] have demonstrated the use of CFD tool in evaluating thermal comfort assessment with the help of Fanger's thermal comfort model for a steady state problem. However, Fanger's thermal comfort model's constitutional incompatibility for transient problems due to its inability to account thermoregulatory activities [3] has caused automobile engineers to explore more comprehensive thermal comfort models for dynamic thermal comfort assessment.…”

Section: Introductionmentioning

confidence: 99%

A case study on human bio-heat transfer and thermal comfort within CFD

Dixit

Gade²

2015

Building and Environment

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Section: Introductionmentioning

confidence: 99%

A case study on human bio-heat transfer and thermal comfort within CFD

Dixit

Gade²

2015

Building and Environment

Self Cite

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“…For a fixed volume flow rate, HRE is in direct proportion to the amount of thermal energy that the air has absorbed in the cabin. An HRE value of 0.5 is considered to be the best possible value for ventilation [13]. If the heat source is near the exit, the HRE value can be as great as 0.5.…”

Section: Heat Removal Efficiency For Novel Schemesmentioning

confidence: 99%

“…The standard k-ε turbulence model is found to perform well [21] for indoor airflows, along with a high computational efficiency. The solar load is the most important factor in the consideration of the vehicle ventilation, Pawar et al [13] presents a study of various ventilation schemes but it was recommended that the solar load be considered before implementing any ventilation strategy. The factors that can affect the solar load are the glass properties, incident solar spectrum, and solar angle of incidence.…”

Section: Solver and Numerical Details Of Solar Loadmentioning

confidence: 99%

“…The interior volume of the rear compartment, glass surface area, and the rear compartment surface area were estimated to be 2.34 m 3 , 2.65 m 2 , and 16.64 m 2 , respectively. Three ventilation cases [13] were examined, as shown in Figure 1. In the first case, as shown in Figure 1a, air enters from the front inlets and flows out from the outlet located near the rear glass.…”

Section: Cabin Geometrymentioning

confidence: 99%

“…They divided a human manikin into 14 segments and performed a study using the finite-element code THESEUS-FE; however, the effect of solar radiation was not considered in their study. Numerical studies in the literature show that Fanger's (PMV) model is used often [13,14] for thermal comfort prediction, while some researchers [15] have considered equivalent temperature to be more appropriate. The values of the PMV from Fanger's model are not sufficient for defining the feeling of discomfort [16]; therefore, attention should be focused on this issue.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Fluid mechanics and sound generation for lung-clearance therapy

Gorman

Sparrow

Krautbauer

2017

HFF

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Purpose The study described here aims to set forth an analysis approach for a specific biomedical therapeutic device principally involving fluid mechanics and resulting sound generation. The function of the therapeutic device is to clear mucus from the airways of the lungs. Clearance of the airways is a primary means of relief for cystic fibrosis and is also effective in less profound dysfunctions such as asthma. The complete system consists of a device to periodically pulse air pressure and a vest that girdles the abdomen of the patient and receives and discharges the pulsating airflow. The source of pulsed air can be tuned both with respect to the amplitude and frequency of the pressure pulsations. Design/methodology/approach The key design tools used here are computational fluid dynamics and the theory of turbulence-based sound generation. The fluid flow inside of the device is multidimensional, unsteady and turbulent. Findings Results provided by the fluid mechanic study include the rates of fluid flow between the device and the inflatable vest, the rates of air supplied to and extracted from the device, the fluid velocity magnitudes and directions that result from the geometry of the device and the magnitude of the turbulence generated by the fluid motion and the rotating component of the device. Both the velocity magnitudes and the strength of the turbulence contribute to the quantitative evaluation of the sound generation. Originality/value A comprehensive literature search on this type of therapeutic device to clear mucus from the airways of the lungs revealed no previous analysis of the fluid flow and sound generation inside of the device producing the pulsed airflow. The results presented in this paper pinpoint the locations and causes of sound generation that can cause audible discomfort for patients.

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Evaluation of Cabin Comfort in Air Conditioned Buses Using CFD

Cited by 11 publications

References 7 publications

A case study on human bio-heat transfer and thermal comfort within CFD

A case study on human bio-heat transfer and thermal comfort within CFD

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

Fluid mechanics and sound generation for lung-clearance therapy

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