| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系專班 === 101 === In recent years, the industrial and economic development of the human consume a lot of fossil fuels. But the fossil energy is getting depleted, the development of nuclear energy has some potential risks. The application of renewable energy becomes current trends. There are several kinds of renewable energy. In Taiwan, solar energy and wind energy are more popular. The application of solar energy frequently used in installation of solar water heater. However, the typhoon is one of the nature disasters in Taiwan. Solar water heater is usually installed on the top of buildings which is without any cover. The wind directions changes due to some factor of seasons or surroundings of the installed location. That may destroy solar water heaters. So we discuss the effect of heat collector under several wind directions.
In this study, a single plate of heat collector which is 60% of the original size is used as the geometric model. We use a commercial CFD software Fluent 6.3.26 for calculation which is a pressure-based finited volume scheme. The Realizable k-ε turbulent model is applied. Owing to the simulated data close to the experiment data, the turbulent intensity and length scale are 11.7% and 0.12m individually. The studies are consist of a solar collector with inflow angle （θ=15°、22.5°、30°、37.5°）and with different guide plate atθ=22.5°
The result shows that low pressure area on upper surface is expanding when inflow angle increased to 30° ,and it’s reducing when inflow angleθ=37.5°. The high pressure area on the lower surface is increased near the left side. Total lift force is increased by the aspect ratio of the cross section in front view. Total drag force is reduced by the changes of the area on the vertical section of the inflow. With a guide plate, the inflow impacts the plates directly, and can reduce the differential pressure between the upper and lower surface on a solar collector. When length of guiding plate increases, shielding effect is more augmented. When the guide plate shorted, the lift force is also increased.
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