3-D numerical and experimental analysis for airflow within a passenger compartment

Chien, Chin-Cheng; Jang, Ji Yeon; Chen, Y. H.; Wu, S. C.

doi:10.1007/s12239-008-0053-2

Cited by 34 publications

(8 citation statements)

References 8 publications

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“…Two processes can cause fluid motion. Fluids can move due to differences in density caused by differences in temperature within the fluid (Chien et al, 2008). This mechanism is called free convection or natural convection.…”

Section: │mentioning

confidence: 99%

Analyzed of Convection Heat Transfer in Cabin Car Equipped With Air Conditioner (AC) Using A Simple Method Assisted by Microsoft Excel

Asmoro¹,

Humami²,

Hakim³

2022

cset

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Visualization of heat flow often uses complex and challenging programs such as Matlab and Ansys Fluent with expensive licenses, and the operation is also difficult. This study aims to demonstrate the phenomenon of convection heat transfer in a simple way. The phenomenon of convection is fairly difficult, and the heat transfer process can cause misconceptions in students. An appropriate and easy-to-use method is needed in preparing for classroom learning. This study was conducted to review the air condition in the car cabin, which is influenced by airflow from the air conditioner, and visualize it. This visualization can be used to explain the phenomenon of heat transfer by convection to students, especially while cooling the car's air conditioner. This research was conducted using a car model with three rows of seats where the air conditioner is only on the front cabin dashboard. On the dashboard, the AC flows are located on the left, right, and center. The calculation is carried out by applying the Black Principle, where other particles around it influence the particle temperature. Microsoft Excel is used to perform mathematical operations and visualize the results in graphs. It successfully delivers a 2D image showing heat distribution in the car cabin space. Visualization of this convection phenomenon can provide an overview of the convection flow phenomenon. So, this method is very easy to operate and apply by teachers in preparing lessons on the phenomenon of temperature convection.

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Section: │mentioning

confidence: 99%

Analyzed of Convection Heat Transfer in Cabin Car Equipped With Air Conditioner (AC) Using A Simple Method Assisted by Microsoft Excel

Asmoro¹,

Humami²,

Hakim³

2022

cset

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show abstract

“…Previous studies have been extensively conducted on the thermal comfort of indoor and outdoor environments based on the climate chamber, field study, and simulation methods [ 6 , 7 , 8 , 9 ]. Previous investigations included different climatic zones [ 10 , 11 , 12 ] and were mainly focused on various built environments, such as offices [ 13 ], residential buildings [ 14 , 15 , 16 ], educational institutes [ 17 ], automobiles [ 18 , 19 , 20 , 21 , 22 ], and museums [ 23 , 24 ]. They considered both physiological and ambient parameters, including skin temperature, heart rate, ambient temperature, air velocity, relative humidity, and globe air temperature, to predict a thermal sensation for specific built environments.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Individual Dynamic Thermal Sensation in Subway Commute Using Smart Face Mask

et al. 2022

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Wearable sensors and machine learning algorithms are widely used for predicting an individual’s thermal sensation. However, most of the studies are limited to controlled laboratory experiments with inconvenient wearable sensors without considering the dynamic behavior of ambient conditions. In this study, we focused on predicting individual dynamic thermal sensation based on physiological and psychological data. We designed a smart face mask that can measure skin temperature (SKT) and exhaled breath temperature (EBT) and is powered by a rechargeable battery. Real-time human experiments were performed in a subway cabin with twenty male students under natural conditions. The data were collected using a smartphone application, and we created features using the wavelet decomposition technique. The bagged tree algorithm was selected to train the individual model, which showed an overall accuracy and f-1 score of 98.14% and 96.33%, respectively. An individual’s thermal sensation was significantly correlated with SKT, EBT, and associated features.

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“…Some researches indicate that the principal factors affecting the occupant's thermal comfort depend on the such thermal conditions as air temperature, relative humidity, mean radiant temperature, and air velocity; in addition to the clothing worn on the occupant and the physical activity of the occupant [1]. Most of investigations on occupant's thermal comfort focus on the thermal environment, especially of the air-flow field and the temperature distributions during cooling or heating period in vehicle cabin [2][3][4][5][6]. The surface temperature plays an important role.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Temporal Surface Thermal Conditions for Thermal Comfort Researches Inside A Vehicle Cabin Under Summer Season Climate

Zhang

Liu

2016

MATEC Web of Conferences

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Abstract. With the proposes of improving occupant's thermal comfort and reducing the air conditioning power consumption, the present research carried out a comprehensive study on the surface thermal conductions and their influence parameters. A numerical model was built considering the transient conduction, convective and radiation heat transfer inside a vehicle cabin. For more accurate simulation of the radiation heat transfer behaviors, the radiation was considered into two spectral bands (short wave and long wave radiation), and the solar radiation was calculated by two solar fluxes (beam and diffuse solar radiation). An experiment was conducted to validate the numerical approach, showing a good agreement with the surface temperature. The surface thermal conditions were numerically simulated. The results show that the solar radiation is the most important factor in determining the internal surface thermal conditions. Effects of the window glass properties and the car body surface conditions were investigated. The numerical calculation results indicate that reducing the transitivity of window glass can effectively reduce the internal surface temperature. And the reflectivity of the vehicle cabin also has an important influence on the surface temperature, however, it's not so obvious as comparison to the window glass.

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3-D numerical and experimental analysis for airflow within a passenger compartment

Cited by 34 publications

References 8 publications

Analyzed of Convection Heat Transfer in Cabin Car Equipped With Air Conditioner (AC) Using A Simple Method Assisted by Microsoft Excel

Analyzed of Convection Heat Transfer in Cabin Car Equipped With Air Conditioner (AC) Using A Simple Method Assisted by Microsoft Excel

Prediction of Individual Dynamic Thermal Sensation in Subway Commute Using Smart Face Mask

Investigation on the Temporal Surface Thermal Conditions for Thermal Comfort Researches Inside A Vehicle Cabin Under Summer Season Climate

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