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Thero-Kinetic Investigation of Solar Chimney Power Plant System with a Sloped Collector

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Tutor: LiQingLing
School: Qingdao University of Science and Technology
Course: Chemical Process Equipment
Keywords: the mountain guide,the solar chimney power plant system,the numericalsimulation,
CLC: TM615
Type: Master's thesis
Year:  2013
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Abstract:
This paper puts forward a new kind solar chimney power plant system supported by southern sloped mountain. By means of theoretical analysis and numerical simulation investigate the heat transfer and flow characteristics of the system.Analysis on thermodynamic process of different field for the solar chimney power plant system supported by southern sloped mountain and build ideal&real thermodynamic cycle. Besides, deduce and analysis the power and efficiency of the system among collector, chimney and turbine. The slope angle closely influents the collector thermal efficiency. The collector thermal efficiency can up to maximum when the slop angle is smaller7-10¡ãthan the local latitude. Furthermore, the system can appropriately reduce the height of vertical chimney and construction problems. At northern latitude35, the solar radiation energy which the sloped collector collected on unit area reach maximum.The power varies with the sloped angle and turns out most positive at30¡ãin the condition of fixed collector area and heingt of vertical chimney,othermore,the efficiency increases with the sloped angle gradually.In the case of same collector area and chimney height, the power and efficiency of solar chimney power plant system supported by southern sloped mountain with appropriate tilted angle is bigger than traditional solar chimney power plant system,besides, the system scale is larger,the gap is larger.Research the numerical simulation of the solar chimney power plant system supported by southern sloped mountain under the condition of no-load by Fluent. Obtain the velocity, pressure and temperature distribution and compare to the traditional solar chimney power plant system, which can verify the correctness of theoretical analysis. Aiming at improve the power and efficiency of the system, pay attention to the influence factors, which include the collector radius, the chimney height and shape, other environmental factors and so on. The result show that, these factors have important effects on the thermo-kinetic characteristics, but also has themselves own law. Then we should take all into consideration.Build the mathematical model of the system with the heat storage layer, By the coupling numerical simulation can get some conclusions:During the day, the heat storage take solar radiation, at the same time, it transfers energy to air in the channel by the storage layer surface. When the solar energy is enough, the storage layer doesn¡¯t on matter on the system. But during the night, the energy storage layer surface transforming becomes the major energy sources, which can ensure a optimistic speed for the air and achieve the continuity of the system. With the time going on, the heat storage layer gradually reach a saturated state and the flow state of system will tend to be stable in the night. For example the model established in the title, When the thickness is0.2m, the heat storage performance is better. The air velocity can keep at8m/s in the night.
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