The effects of using different type of inlet vents on the thermal characteristics of the automobile cabin and the human body during cooling period

Kılıç, Muhsin; Sevilgen, Gökhan

doi:10.1007/s00170-011-3594-x

Cited by 16 publications

(10 citation statements)

References 7 publications

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“…The Reynolds number at the exit of the central air vents based on stream wise mean velocity and on the equivalent diameter (De 1 = 0.093m) was Re 1 = 17800, and for the side air vents Re2=14000 (De2= 0.073m). The inlet turbulence intensity was imposed for all vents as 4.11%, being calculated using the empirical relation proposed by Jaramillo [13]. For the left side air vent, we modified the angle of the vertical guiding vanes in the horizontal plane from 0° to 30°, with a 5° step angle.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…The results showed that for the same initial conditions a round shape vent might be more efficient than regular square or elliptical vents, leading to a lower mean air temperature and to a better distribution of air velocity and temperature, under certain circumstances. The effects on thermal sensation of different positions of the air vents inside the passenger car were also numerically investigated by Kilic [13]. Three different positions, for the same cooling power, were analyzed under transient conditions.…”

Section: Introductionmentioning

confidence: 99%

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CFD simulation of a cabin thermal environment with and without human body – thermal comfort evaluation

et al. 2018

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Nowadays, thermal comfort became one of the criteria in choosing a vehicle. In last decades time spent by people in vehicles had risen substantially. During each trip, thermal comfort must to be ensured for a good psychological and physical state of the passengers. Also, a comfortable environment leads to a higher power concentration of the driver thereby to a safe trip for vehicle occupants and for all traffic participants. The present study numerically investigated the effect of human body sited in the driver's place, over the air velocity distribution and over the thermal comfort in a passenger compartment. CFD simulations were made with different angles of the left inlet grill, in both cases, with and without driver presence. In majority of the actual vehicles environment studies, are made without consideration of human body geometry, in this case, the results precision can be affected. The results show that the presence of human body, lead to global changing of the whole flow pattern inside the vehicular cabin. Also, the locations of the maximum velocities are changing with the angle of the guiding vanes. The thermal comfort PMV/PPD indexes were calculated for each case. The presence of human body leads to a more comfortable environment.

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Section: Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD simulation of a cabin thermal environment with and without human body – thermal comfort evaluation

et al. 2018

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“…In their numerical study, they developed a three dimensional CFD model of the vehicle cabin with an only driver inside and used the velocity and temperature values obtained from their experimental study. They also examined the effect of using different boundary conditions defined on human body surfaces to evaluate the thermal comfort [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The 1-D analysis of cool down simulation of vehicle HVAC system

2021

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In this paper, a detailed combined 1D model of Heating, Ventilation and Air Conditioning systems of a vehicle were developed by using the LMS Imagine Lab Amesim software package. The numerical simulations were considered for soaking and cool down analysis under different environmental conditions. The thermal performance of different refrigerants as R-134a and R-1234yf were evaluated in terms of thermal performance and energy consumption. According to the soaking simulation results, the cabin air temperature values ranged from 49°C to 57°C in general. The maximum increase in cabin air temperature value was about 22°C obtained for 1000 15 W/m 2 solar load. The total time until reaching the steady-state conditions for a target temperature value (23.5°C) was different for all simulations. The total time was calculated as 910 seconds for 1000 W/m 2 solar load by using R134a refrigerant loop. The results also showed that although the thermal performance of R-134a was slightly better, R-1234yf can be used due to its environmental properties with acceptable performance. The calculated COP values during cooldown analysis were ranged from 1.71 to 4.52 in general. The minimum value was obtained for the cases which had a maximum solar load and higher cabin interior temperature values. The calculated temperature data for soaking and cool down analysis were in good agreement with the reference data presented in this study. These numerical results are very important for reducing the thermal load of the vehicle cabin considering energy consumption of the HVAC system for different thermal conditions.

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“…In addition to that, with more stringent requirements for efficient utilisation of energy resources within the transport industry must rely on improving energy efficiency of vehicles [1,2]. Computational fluid dynamics (CFD) analysis tool is now being used to evaluate the different environmental conditions of an automobile cabin in many aspects [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The need to reduce heat loads that enter passenger compartments has become an important issue in the early stage of vehicle design and the radiation plays an important role on the thermal comfort in the compartment [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The need to reduce heat loads that enter passenger compartments has become an important issue in the early stage of vehicle design and the radiation plays an important role on the thermal comfort in the compartment [3,4]. For these reasons described, CFD method is a useful tool to determine 3-D velocity and temperature distributions, thermal characteristics of the automobile cabin, and the local heat transfer characteristics of the surfaces of the human body [16,17]. Computational fluid dynamics (CFD) analysis tool is now being used to evaluate the different environmental conditions of an automobile cabin in many aspects [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of transient cooling of an automobile cabin with a virtual manikin under solar radiation

Sevilgen

Kılıç

2013

Therm sci

Self Cite

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The aim of the paper is to present a three dimensional transient cooling analysis of an automobile cabin with a virtual manikin under solar radiation. In the numerical simulations the velocity and the temperature distributions in the automobile cabin as well as around the human body surfaces were computed during transient cooling period. The surface-to-surface radiation model was used for calculations of radiation heat transfer between the interior surfaces of the automobile cabin and a solar load model that can be used to calculate radiation effects from the sun's rays that enter from the glazing surfaces of the cabin was used for solar radiation effects. Inhomogeneous air flow and non-uniform temperature distributions were obtained in the automobile cabin and, especially in ten minutes of cooling period, high temperature gradients were computed and measured and high temperature values were obtained for the surfaces which were more affected from the sunlight. Validations of the numerical results were performed by comparing numerical data with the experimental data presented in this study. It is shown that the numerical results were good agreement with the experimental data

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The effects of using different type of inlet vents on the thermal characteristics of the automobile cabin and the human body during cooling period

Cited by 16 publications

References 7 publications

CFD simulation of a cabin thermal environment with and without human body – thermal comfort evaluation

CFD simulation of a cabin thermal environment with and without human body – thermal comfort evaluation

The 1-D analysis of cool down simulation of vehicle HVAC system

Investigation of transient cooling of an automobile cabin with a virtual manikin under solar radiation

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