Effects of Radiative Heat on Vehicle Interior-Exterior Flow Fields and Passenger Comfort
2013
Hochschulschrift
Zugriff:
101
Combining the flow fields inside and outside of an electric vehicle, this thesis simulates the temperature and flow fields and aims to investigate how comfort a human body model is solely under air ventilation. The basic shape and dimensions of the electric car are based on a Ford Pronto. The analysis considers different air ventilation schemes, vehicle speeds, and ambient conditions. The numerical simulations use the RNG k-ε turbulence model, solar radiation module along with the DO thermal radiation model, and different volumetric heat generation rates to model the different metabolic rates of a manikin. Simulation results mainly focus on the surface temperature of the manikins. Then, the PMV and PPD values are calculated through the equations. Current study found that if the vents on the dashboards and car rear panel are activated, fresh air flows into the cabin through these vents and the third row of windows; forms a flow circulation within the cabin; and discharges through the first and second row of windows. If the vents are closed, air only enters the cabin through the third row of the windows; forms larger flow circulation; and leaves the cabin through the first and second row of windows. For a vehicle traveling north at 9 a.m., the passengers on the co-pilot side are heated more seriously. In contrast, when the vehicle travels towards the east at 11 a.m., the passengers are generally covered by the roof leaving only the hands and the feet of the first row users being exposure to the solar radiant heat. Even so, the rise in the ambient temperature heats up all occupants in the cabin. If ones metabolic rate increases, ones surface temperature will increase too. Also, a greater vehicle speed will increase the air ventilation rates into the cabin thus help the removal of heat from the body. Furthermore, the activation of vents on the dashboards and rear panel significantly improve the PMV and PPD values of the first row passengers. The improvement of the PMV and PPD values of the second-row passengers greatly relies on the traveling speed of the vehicle. The PMV and PPD values of the third row passengers are not promising mainly because the amount of fresh air arriving at the third row sharply decreases when the aforementioned vents are activated.
Titel: |
Effects of Radiative Heat on Vehicle Interior-Exterior Flow Fields and Passenger Comfort
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Autor/in / Beteiligte Person: | Chih-Wei, Chang ; 張智瑋 |
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Veröffentlichung: | 2013 |
Medientyp: | Hochschulschrift |
Sonstiges: |
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