Analysis and validation of transient thermal model for automobile cabin

Wu, Jianghong; Jiang, Feng; Song, Hang; Liu, Chaopeng; Lu, Biwang

doi:10.1016/j.applthermaleng.2017.03.084

Cited by 30 publications

(10 citation statements)

References 15 publications

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“…All solid surfaces were considered stationary walls with No-slip conditions. The convective heat transfer coefficient was calculated based on the empirical formula in Equation 12 [29]. The inlets and outlets of the HVAC system were treated as the wall when the vehicle kept ventilation off.…”

Section: The Thermal Setupmentioning

confidence: 99%

Modeling In-Vehicle VOCs Distribution from Cabin Interior Surfaces under Solar Radiation

Tong

Líu

2020

Sustainability

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In-vehicle air pollution has become a public health priority worldwide, especially for volatile organic compounds (VOCs) emitted from the vehicle interiors. Although existing literature shows VOCs emission is temperature-dependent, the impact of solar radiation on VOCs distribution in enclosed cabin space is not well understood. Here we made an early effort to investigate the VOCs levels in vehicle microenvironments using numerical modeling. We evaluated the model performance using a number of turbulence and radiation model combinations to predict heat transfer coupled with natural convection, heat conduction and radiation with a laboratory airship. The Shear–Stress Transport (SST) k-ω model, Surface-to-surface (S2S) model and solar load model were employed to investigate the thermal environment of a closed automobile cabin under solar radiation in the summer. A VOCs emission model was employed to simulate the spatial distribution of VOCs. Our finding shows that solar radiation plays a critical role in determining the temperature distribution in the cabin, which can increase by 30 °C for directly exposed cabin surfaces and 10 °C for shaded ones, respectively. Ignoring the thermal radiation reduced the accuracy of temperature and airflow prediction. Due to the strong temperature dependence, the hotter interiors such as the dashboard and rear board released more VOCs per unit time and area. A VOC plume rose from the interior sources as a result of the thermal buoyancy flow. A total of 19 mg of VOCs was released from the interiors within two simulated hours from 10:00 am to noon. The findings, such as modeled spatial distributions of VOCs, provide a key reference to automakers, who are paying increasing attention to cabin environment and the health of drivers and passengers.

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Section: The Thermal Setupmentioning

confidence: 99%

Modeling In-Vehicle VOCs Distribution from Cabin Interior Surfaces under Solar Radiation

Tong

Líu

2020

Sustainability

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“…Theoretical models of passenger thermal comfort have been studied [15][16][17][18], as well as factor evaluation [19], fluidic design [20,21], simulation analysis [22][23][24], experiment [25,26], and management strategy formulation research [27]. Ever-increasing demands in low-carbon emission vehicles [28][29][30][31][32] have propelled AC development considering energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Design of Regional Air Conditioning to Increase Automobile Cabin Energy Efficiency

Yang

Chen

et al. 2019

Energies

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With the goal of increasing energy efficiency and passenger comfort in an automobile cabin, we developed a regional air-conditioning design to control cold air in specific regions, and an air management strategy that can keep air circulation when the car engine cuts out. According to computational simulations, an air velocity of 2 m/s was adopted, which could form an independent flow field space in the cabin with a temperature gap of 7 °C according to the user’s needs. The designed regional air-conditioning and circulation system could create independent flow field spaces with temperature differences. Inlet air volume demand was also reduced by 60% and blower power by 53 W. In addition, the cabin ventilation system led air exchange rate reached 89% per hour. In 20 min of exposure under sun, the system could lower the cabin temperature by 12.3 °C.

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“…Polymeric materials are used in automobile manufacturing mainly because of low specific weight [1,2]. The automobile interior is a complex thermal environment which continually varies during travelling on roads [3]. Wu et al [3] reported that panel interior temperature increases as driving velocity increases in the evening, while the interior temperature decreases as driving velocity increases during daytime.…”

Section: Introductionmentioning

confidence: 99%

“…The automobile interior is a complex thermal environment which continually varies during travelling on roads [3]. Wu et al [3] reported that panel interior temperature increases as driving velocity increases in the evening, while the interior temperature decreases as driving velocity increases during daytime. The maximum value of automobile interior temperature registered by Wu et al [3] was near to 46°C.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al [3] reported that panel interior temperature increases as driving velocity increases in the evening, while the interior temperature decreases as driving velocity increases during daytime. The maximum value of automobile interior temperature registered by Wu et al [3] was near to 46°C. The volatile substances from polymers used in vehicles interior can generate odors of varying intensities and duration which may or may not please people.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical compounds emitted by main components used in interior of vehicles

Librelon¹,

Souza²,

Lins³

2018

Express Polym. Lett.

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Odors from materials used in new vehicles may cause satisfaction or dissatisfaction for people. This duality is due to a stimulation caused by receptors which act differently in each individual. It is already known that odors exhaling in a vehicles interior are caused by a gaseous mixture of the various materials which are volatilized, especially with the increase of internal temperature. The components of a newly manufactured automotive vehicles interior of high surface representativeness selected in this work are eight: air conditioner, ceiling liner, shelf package, rubber mats, door panel, carpet, instrument panel, and seats, which were analyzed by gas chromatography for the identification of volatile substances. The proportion of the peak area of each compound was calculated. Gas chromatography analysis identified the main substances from materials used in interior of vehicles which contribute to the new car odor: toluene, p-xylene, ethylbenzene or benzene derivatives, except in carcass of air conditioner. Polypropylene is a constituent of these components, except the rubber mats. Carbon disulfide appeared with a significant proportion of area in rubber mats and contributed in the formation of car odors.

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Analysis and validation of transient thermal model for automobile cabin

Cited by 30 publications

References 15 publications

Modeling In-Vehicle VOCs Distribution from Cabin Interior Surfaces under Solar Radiation

Modeling In-Vehicle VOCs Distribution from Cabin Interior Surfaces under Solar Radiation

An Innovative Design of Regional Air Conditioning to Increase Automobile Cabin Energy Efficiency

Chemical compounds emitted by main components used in interior of vehicles

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