碩士 / 國立成功大學 / 航空太空工程學系碩博士班 / 95 / With the increase of living standard nowadays, automobiles are not only a mean of transportation tool but also equipped more capability functions, better quality and much comfort. In this study, by using experiment and numerical simulation, thermal comfort for passengers in an air-conditioned automobile cabin is numerically investigated with a PMV indicator and a PPD indicator for finding a best temperature. For the experiment part, the model of an experimental car used is a car of Nissan Sentra 2000. The air conditioning system in the cabin was set at 25°C. There were three different cases of experiments: empty car, a driver in the cabin, and four passengers in the cabin. In each case, temperature, wind velocity at the fan and relative humidity were measured in different fan levels. In the numerical simulation part, the commercial software FLUENT were used. Without regard to chemical reaction, gravity and radiant heat transfer, the boundary temperature and the wind velocity at fan measured by experiment were the inputs for calculation in the K-ω turbulent model. For code validation, the temperatures calculated by numerical simulation were compared with these for experiment. Finally, the air velocity found by numerical simulation and the relative humidity measured by experiment, we can find the values of the PMV indicator, PPD indicator, and best temperature. From our simulation results, computed temperature distribution for each case is compared well with that in experiment, and their difference measured by mean error is less than 3°C. The computed and experimental temperatures in unsteady case are very close for the case of empty car. For the evaluation of thermal comfort, it is found that for the case of upward-direction fan, the predicted best temperature is the highest. But, for the case of downward-direction fan, the predicted best temperature is the lowest. For the case of four passengers seated in the cabin, the best temperature for man who seated in passenger’s seat is slight higher (0.2 to 0.8°C) than others.
| Identifer | oai:union.ndltd.org:TW/095NCKU5295024 |
| Date | January 2007 |
| Creators | Chang-Xian Liu, 劉昶賢 |
| Contributors | Shen-min Liang, 梁勝明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 125 |
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